# Realtime Avatar > A realtime AI avatar API and TypeScript SDK. Give a character a face and a voice, put them > on a live call in a browser or a native app, and let them use your tools. One mint endpoint > on your server decides who may call and what the character knows; one component renders it. The sections between generated markers below are rebuilt by `bun scripts/content/sync-content.ts` — do not hand-edit them. ## Start here - [Realtime Avatar](https://realtimeavatar.ai/): the product itself — what it is, what it replaces, and a prompt you can hand to a coding agent. Also as markdown at https://realtimeavatar.ai/index.md, which inlines the whole FAQ. - [Pricing](https://realtimeavatar.ai/pricing): every plan and what a live minute costs. Also as markdown at https://realtimeavatar.ai/pricing.md - [Overview](https://realtimeavatar.ai/docs): what the product is and what a call costs. - [Quickstart](https://realtimeavatar.ai/docs/quickstart): key → app on an example avatar → your own character. - [Authentication](https://realtimeavatar.ai/docs/authentication): what belongs on your server and why. ## Agent tools (MCP) If you are a coding agent, you do not have to guess at this account. There is an MCP server — `realtime-avatar-mcp` on npm, stdio, no build step — that tells you which avatars actually exist, what a call costs, and what the balance is, before you write any code. Avatar ids cannot be guessed; call `list_avatars` first. { "mcpServers": { "realtime-avatar": { "command": "npx", "args": ["-y", "realtime-avatar-mcp"], "env": { "REALTIME_AVATAR_API_KEY": "YOUR_API_KEY" } } } } Read tools (`list_avatars`, `get_avatar`, `credit_balance`, `list_sessions`, `list_clips`) are on by default. Set `REALTIME_AVATAR_ALLOW_WRITES=1` to also get `create_avatar_from_image`, `create_avatar_from_video`, `upload_asset`, `create_remote_asset`, `start_call`, `set_loop`, `set_clip_library` and `sync_clips`. Full page: https://realtimeavatar.ai/docs/mcp.md The server is a BUILD-TIME tool. Applications should still mint sessions from their own server route — that endpoint is where the caller is authorised and the character briefed. ## Machine-readable surfaces - MCP server for agents: `npx -y realtime-avatar-mcp` — see above, and https://realtimeavatar.ai/docs/mcp.md - Full docs as one file: https://realtimeavatar.ai/llms-full.txt - Every docs page as markdown: append `.md` to its URL. - Or ask any page for markdown at its own URL: send `Accept: text/markdown`. Pages with a published mirror answer `200 text/markdown` and name it in `Content-Location`; pages without one answer HTML if you will take it, and `406` if you said you would not. - The landing page as markdown, FAQ inlined: https://realtimeavatar.ai/index.md - Pricing as markdown: https://realtimeavatar.ai/pricing.md - OpenAPI 3.1 for the whole API: https://realtimeavatar.ai/openapi.json — 24 operations, request and response schemas, and the scope each one needs, machine-readably in `x-required-scopes` on every operation and `x-scopes` on the security scheme. Generate a client from it rather than reading the endpoint table. - API authentication, as RFC 9728 protected-resource metadata: https://realtimeavatar.ai/.well-known/oauth-protected-resource/api — the bearer scheme and every scope a key can carry. There is no OAuth authorization server: keys are minted in the dashboard or with `POST /api/v1/api-keys`, and a 401 or 403 says so in `WWW-Authenticate`. - A wrong path answers a real `404` everywhere, with the site map in the body — as markdown or JSON if you asked for either, and always as JSON under `/api`. ## Pricing One meter: seconds on air. Speech recognition, the LLM, the voice and rendering are included. Published self-serve overage is $0.08–$0.095 per minute ($4.80–$5.70 per hour). Your own hosting and external tools remain separate. | Plan | Monthly | Included realtime | Overage | Concurrent streams | | --- | --- | --- | --- | --- | | Sandbox | Free | 8 min | — | 2 | | Starter | $9/mo | 120 min | $5.70/hour | 3 | | Developer | $24/mo | 600 min | $5.10/hour | 10 | | Studio | $119/mo | 3,000 min | $4.80/hour | 20 | | Scale | Quoted | Your volume | Quoted | Custom | Creating a character is billed separately from talking to it: $3 per avatar beyond the number your plan includes, its generated resting loop included. Credits are one pot: the same balance pays for generating a character and for the minutes it then talks. Scale is priced by conversation rather than published, so no figure for it appears on this site. Full table: https://realtimeavatar.ai/pricing · as markdown: https://realtimeavatar.ai/pricing.md Cost calculator: https://realtimeavatar.ai/tools/avatar-cost-calculator · worked scenarios: https://realtimeavatar.ai/blog/realtime-ai-avatar-api-pricing ## Documentation (raw markdown) Every docs page is mirrored as plain markdown — append `.md` to any docs URL. - [Realtime Avatar API](https://realtimeavatar.ai/docs.md): Put a live character in your product, on a voice or video call, with your own tools wired into the conversation. - [Quickstart](https://realtimeavatar.ai/docs/quickstart.md): From an API key to a live avatar call in three steps: get a key, build the app on an example avatar, then swap in a character of your own. - [Authentication](https://realtimeavatar.ai/docs/authentication.md): Get a key, keep it on your server, and decide who may start a call. - [Build with Lovable, Bolt, v0 and Replit](https://realtimeavatar.ai/docs/ai-app-builders.md): Add a live AI avatar call to an app built in Lovable, Bolt.new, v0 or Replit: a copy-paste prompt per builder, where the API key goes, and a starter repo that opens in one click. - [Build a realtime AI avatar in Next.js](https://realtimeavatar.ai/docs/nextjs.md): Build a working Next.js avatar app with a server-side session proxy, React video UI, a complete local starter, and troubleshooting. - [TanStack Start](https://realtimeavatar.ai/docs/tanstack-start.md): Mount the realtime avatar proxy in a TanStack Start app: a splat server route on the server, one component in the browser. - [Express](https://realtimeavatar.ai/docs/express.md): Mount the realtime avatar proxy as Express middleware — Express 4 or 5 — with the same authorize and session policy every adapter takes. - [Hono, Workers, Bun and Deno](https://realtimeavatar.ai/docs/hono.md): Mount the realtime avatar proxy on any Fetch-handler runtime — Hono, Cloudflare Workers, Bun or Deno — including the apiKey factory Workers require. - [Realtime AI avatars with React and React Native](https://realtimeavatar.ai/docs/react.md): Embed live AI avatar calls in React or React Native with AvatarCall, useAvatarCall, connection states, and a server-side session proxy. - [Build avatar apps with the Realtime Avatar MCP server](https://realtimeavatar.ai/docs/mcp.md): Connect a coding agent to Realtime Avatar: configure the MCP server, inspect available avatars, and build a working app with the TypeScript SDK. - [Creating an avatar](https://realtimeavatar.ai/docs/video.md): One image in, a moving character out: generated motion, idle variations and requestable actions, full-library declarations, loop editing, and generation prices. - [Calls](https://realtimeavatar.ai/docs/sessions.md): What your server decides, what the client reports, and how to end a call without cutting the character off mid-sentence. - [Editing a character](https://realtimeavatar.ai/docs/editing.md): Change an avatar's clips and resting loop after creation: how to declare them, how each change settles, and the refusals worth telling apart. - [Tool calling](https://realtimeavatar.ai/docs/tool-calling.md): The platform never executes your tools. Here is the boundary, the client tool plane, and the server loop that turns a call into a working agent with a face. - [API reference](https://realtimeavatar.ai/docs/api-reference.md): Every public endpoint on https://realtimeavatar.ai/api/v1 — what it takes, what it returns, which scope it needs, and how it fails. - [Experimental features](https://realtimeavatar.ai/docs/experimental.md): What is experimental right now, what that word promises, and how to turn each one on. Included with Studio and above. ## Blog (raw markdown) Published posts as markdown; append `.md` to any post URL. - [Build an Avatar Assistant People Can Use Without Speaking or Hearing](https://realtimeavatar.ai/blog/accessible-avatar-assistant-without-voice.md): Build a text\-first appointment assistant with optional avatar calls, verified confirmations, keyboard controls, and clear timeout recovery\. - [Build an AI Avatar Fantasy Adventure with Choices Beyond a Menu](https://realtimeavatar.ai/blog/ai-avatar-fantasy-adventure-story-game.md): Build a fantasy adventure where players invent solutions, cross a floating market with an avatar guide, and reach an ending shaped by their ideas\. - [Build an AI Avatar Horror Hotline Players Can Hang Up On](https://realtimeavatar.ai/blog/ai-avatar-horror-hotline-game.md): Build a playable AI avatar horror hotline with a stranded caller, a fictional island map, three consequential choices, and endings players can replay\. - [Build an AI Avatar Interrogation Mystery Players Can Solve](https://realtimeavatar.ai/blog/ai-avatar-interrogation-mystery-game.md): Build a playable AI avatar mystery with three suspects, cross\-checkable clues, a fixed solution, and an accusation that rewards evidence over endless chat\. - [Build an AI Avatar Party Game with an Improv Host](https://realtimeavatar.ai/blog/ai-avatar-party-game-improv-host.md): Build a three\-round AI avatar party game where friends pitch absurd inventions, survive a twist, and vote for a winner, with a host who keeps it moving\. - [The $1M ARR AI Companion Playbook for 2027](https://realtimeavatar.ai/blog/ai-companion-million-arr-playbook-2027.md): Build toward a $1M ARR AI companion business: choose a niche, rent realtime infrastructure, cap call costs, and test retention and distribution\. - [Build an AI Customer Support Avatar That Knows When to Hand Off](https://realtimeavatar.ai/blog/ai-customer-support-avatar-human-handoff.md): Build a support avatar with authenticated order lookup, consent\-based summaries, durable tickets, and honest human\-handoff states using Realtime Avatar\. - [Build an AI Email Assistant That Shows the Evidence Behind Its Briefing](https://realtimeavatar.ai/blog/ai-email-assistant-source-linked-briefings.md): Build a read\-only AI email briefing with source\-linked exceptions, visible sync limits, thread comparisons, and optional voice discussion before a trip\. - [Build an AI Game NPC That Respects Quest State and Spoilers](https://realtimeavatar.ai/blog/ai-game-npc-dialogue-quest-state.md): Build an AI game NPC with game\-owned quest state, spoiler\-safe context, retry\-safe rewards, save recovery, and optional browser avatar conversations\. - [Build an AI Museum Avatar Guide That Can Show Its Sources](https://realtimeavatar.ai/blog/ai-museum-avatar-guide-collection-sources.md): Build an AI museum avatar guide with official collection records, visible sources, careful attribution, object\-level image rights, and honest unknowns\. - [Build AI Roleplay Chat with Edits, Rewinds and Separate Story Branches](https://realtimeavatar.ai/blog/ai-roleplay-chat-edit-rewind-branches.md): Build AI roleplay chat with distinct edit, regenerate, rewind and branch actions, consistent checkpoints, and guards against canceled or stale replies\. - [Build an AI Shopping Avatar That Compares Products Before Checkout](https://realtimeavatar.ai/blog/ai-shopping-avatar-product-comparison.md): Build a read\-only shopping avatar with exact Shopify variants, source\-backed comparisons, honest stock labels, and price rechecks before checkout\. - [Build an AI Story Generator That Can Stop, Save and Continue Cleanly](https://realtimeavatar.ai/blog/ai-story-generator-streaming-save-cancel.md): Build a streaming AI story generator with separate drafts, explicit acceptance, reliable stop controls, revision checks and honest recovery after disconnects\. - [AI Story Generator or Character Roleplay? Choose How You Want to Play](https://realtimeavatar.ai/blog/ai-story-generator-vs-character-roleplay.md): Choose an AI story generator, character roleplay or branching fiction\. Try three cozy prompts, fix unwanted narration and keep your story going\. - [How to Build an AI Bible Study Chatbot with Voice and an Avatar](https://realtimeavatar.ai/blog/build-ai-bible-study-avatar.md): Build a voice\-and\-avatar Bible study guide with source\-linked passages, clear AI disclosure, translation labels, and application\-owned conversation context\. - [Build AI Character Video Keepsakes: Turn One Great Scene Into a Takeaway](https://realtimeavatar.ai/blog/build-ai-character-video-keepsakes.md): Build AI character video keepsakes from player\-approved moments, with editable prompts, clear costs, private previews and a small paid\-demand test\. - [Build an AI Companion App: Make the First Conversation Worth Returning To](https://realtimeavatar.ai/blog/build-ai-companion-app-first-session.md): Build an AI companion app's first session with character choice, a useful opening, optional calls, explicit guest saves, and honest credit exits\. - [Build an AI Roleplay Comic Generator: Give Players a Story Worth Sharing](https://realtimeavatar.ai/blog/build-ai-roleplay-comic-generator.md): Turn an original roleplay scene into a four\-panel comic with editable storyboards, consistent characters, panel retries, and a paid\-issue experiment\. - [How to Build an AI Tarot Chatbot with Voice and a Live Avatar](https://realtimeavatar.ai/blog/build-ai-tarot-chatbot-avatar.md): Build an AI tarot chatbot with stable card draws, tool\-backed context, voice and avatar sessions, clear pricing, and a separate astrology calculation layer\. - [Character\.AI Alternatives for Builders: Consumer App, Agent Framework or Avatar API?](https://realtimeavatar.ai/blog/character-ai-alternative-api-build-vs-buy.md): Choose a Character\.AI alternative for your own app by separating character authoring, agent infrastructure and managed avatar calls, with a concrete test\. - [Free AI Character Chat: Check the Limits Before Starting a Story](https://realtimeavatar.ai/blog/free-ai-character-chat-voice-video-limits.md): Find free AI character chat that fits your routine\. Check text limits, premium models, ads, voice minutes, video credits, and what happens after a trial\. - [Build an Interactive Romance Short Drama Players Can Step Into](https://realtimeavatar.ai/blog/interactive-romance-avatar-short-drama.md): Build a replayable romance episode with an AI avatar: a station reunion, meaningful choices, satisfying endings, and a practical live\-call implementation\. - [MCP, A2A, PAP and Agent Payments: What Each Layer Actually Does](https://realtimeavatar.ai/blog/mcp-a2a-pap-agent-payment-protocols.md): Compare MCP, A2A, PAP, ACP and AP2 by responsibility and maturity, with a shopping\-agent example separating access, approval, payment and verified results\. - [Keep Personal Agent Tasks Running After the Call Ends](https://realtimeavatar.ai/blog/personal-agent-background-tasks-after-call.md): Keep personal agent tasks running after a voice call with app\-owned jobs, honest status, safe retries, and recoverable context in Realtime Avatar\. - [Designing a Personal Agent Users Can Understand, Correct and Approve](https://realtimeavatar.ai/blog/personal-agent-trust-approval-interface.md): Design a personal agent approval and correction interface that separates proposals, permission and verified results, with practical Realtime Avatar boundaries\. - [Build a Personal AI Assistant for Daily Planning with Voice and an Avatar](https://realtimeavatar.ai/blog/personal-ai-assistant-daily-planning-avatar.md): Build a daily\-planning personal AI assistant with calendar context, voice and an avatar\. Keep schedules, memory and confirmed actions in your application\. - [Personal AI Assistant Memory: Corrections, Provenance and Migration](https://realtimeavatar.ai/blog/personal-ai-assistant-memory-correction-migration.md): Build personal AI assistant memory that preserves corrections, tracks provenance, imports only supported context, and stays accurate across new calls\. - [Build a Personal Assistant That Continues from Phone to Desktop](https://realtimeavatar.ai/blog/personal-assistant-phone-to-desktop-handoff.md): Design a phone\-to\-desktop assistant handoff with confirmed trip context, authenticated resume, fresh calls, and safeguards against stale device commands\. - [Build a Talking Virtual Pet Players Want to Visit, Not Worry About](https://realtimeavatar.ai/blog/talking-virtual-pet-avatar-game.md): Build a talking virtual pet around tiny expeditions, meaningful choices and a personal scrapbook, with satisfying visits and no missed\-day guilt\. - [Building Interactive Avatar Training Courses with Realtime AI](https://realtimeavatar.ai/blog/building-interactive-avatar-training-courses-with-realtime-ai.md): Explore the engineering of dynamic, real\-time AI avatar training courses, moving beyond static video to interactive, adaptive learning experiences\. - [Your personal agent deserves a face](https://realtimeavatar.ai/blog/give-your-personal-agent-a-face.md): Instinct, Muse, and Tab are making personal agents part of everyday life\. Realtime Avatar helps developers give their own agent a face people can talk to\. - [From Portrait to Presence: Realtime AI Avatars for Dynamic Training](https://realtimeavatar.ai/blog/from-portrait-to-presence-ai-avatars-for-realtime-training.md): Explore how to build interactive AI training experiences using realtime avatars, created from a single image and deployed for live, dynamic learning\. - [Field Notes: Realtime AI Avatars for Engaging and Scalable Training](https://realtimeavatar.ai/blog/field-notes-realtime-ai-avatars-for-engaging-and-scalable-training.md): Explore how realtime AI avatars transform corporate training, offering scalable, consistent, and interactive learning experiences\. Understand creation\. - [Field Notes: Navigating Live Avatar API Alternatives for Developers](https://realtimeavatar.ai/blog/live-avatar-api-alternatives-for-developer-architectures.md): An engineer's guide to Live Avatar API alternatives, focusing on real\-time conversational AI, single\-image avatar creation, and integration flexibility\. - [Choosing a Realtime AI Avatar API for Live Web Conversations](https://realtimeavatar.ai/blog/choosing-realtime-ai-avatar-api-web-conversations.md): Navigate API options for live AI avatars in web apps\. Understand the division of labor, latency, customization, and integration of leading platforms\. - [Which Talking Avatar APIs Include Speech Recognition, the Language Model, and Text\-to\-Speech?](https://realtimeavatar.ai/blog/full-stack-talking-avatar-apis-stt-llm-tts-integration.md): Explore how Realtime Avatar APIs orchestrate speech recognition, language models, and text\-to\-speech for interactive digital human experiences\. - [Realtime AI avatar APIs compared \(October 2026\): price per minute, free tiers, SDKs, tools](https://realtimeavatar.ai/blog/realtime-ai-avatar-apis-compared-2026.md): Tavus, LiveAvatar, Anam, Simli, Beyond Presence, D\-ID, bitHuman and Realtime Avatar compared on price per minute, free tier, SDKs and tool calling\. - [How to put a real\-time AI avatar in a React Native or Expo app](https://realtimeavatar.ai/blog/realtime-ai-avatar-react-native-expo.md): Add a live, interruptible AI avatar video call to React Native or Expo: install, dev build, server route, native call screen and idle video, with real SDK code\. - [Realtime AI Avatars: Navigating GitHub for Open\-Source Components and Managed SDKs](https://realtimeavatar.ai/blog/realtime-ai-avatars-github-components-vs-managed-sdk.md): Explore the landscape of realtime AI avatars on GitHub, from assembling open\-source components to leveraging production\-ready SDKs like the \`realtime\-avatar\`\. - [How much does Tavus CVI cost per minute? Tavus pricing and the per\-hour math \(October 2026\)](https://realtimeavatar.ai/blog/tavus-pricing-per-minute.md): Tavus conversational video costs $0\.26 to $0\.35 per minute in overage, $15\.60 to $21 an hour\. Plan\-by\-plan math, the 30\-second minimum, and comparisons\. - [Create Your Own AI Character: Personality, Voice and a Face](https://realtimeavatar.ai/blog/generating-realtime-ai-avatars-from-portrait-to-live-interaction.md): Create an original AI character with a practical personality brief, portrait, voice and greeting\. Learn what to customize, test and check before paying\. - [The Engineering of Realtime AI Avatar Chatbots: Bridging Talk and Action](https://realtimeavatar.ai/blog/the-engineering-of-realtime-ai-avatar-chatbots.md): Explore the core architecture of realtime AI avatar chatbots, from full\-duplex conversation to tool integration, for dynamic and actionable interactions\. - [Architecting Real\-Time AI Video Avatars: From Image to Live Presence](https://realtimeavatar.ai/blog/architecting-realtime-ai-video-avatars-from-image-to-live-presence.md): Explore the architecture behind real\-time AI video avatars, from single portrait image creation to live, interactive conversational experiences\. - [Realtime Avatar: A Tavus Alternative for Live AI Characters](https://realtimeavatar.ai/blog/tavus-alternative-realtime-avatar-griffin.md): Looking for a Tavus alternative after Griffin's October 1 launch? Discover Realtime Avatar for custom AI characters and live conversations, then try it free\. - [AI Voice Chat or Video Call? What Changes When a Character Talks Back](https://realtimeavatar.ai/blog/field-notes-on-realtime-ai-avatar-video-from-portrait-to-live-interaction.md): Choose between AI voice messages, live voice chat, avatar video calls and generated clips, with a practical checklist for quality, controls and cost\. - [Realtime AI Avatars: Engineering Presence, Informed by Developer Insights](https://realtimeavatar.ai/blog/realtime-ai-avatars-engineering-presence-developer-insights.md): Explore the technical challenges and solutions for building real\-time AI avatars, drawing insights from developer communities and practical implementation\. - [The Production Divide: Open Source vs\. Managed APIs for Realtime AI Avatars](https://realtimeavatar.ai/blog/the-production-divide-open-source-vs-managed-apis-for-realtime-ai-avatars.md): Building real\-time AI avatars from open\-source components presents significant engineering challenges\. We explore the divide and practical solutions\. - [How to Build a Live AI Avatar Host for Streaming](https://realtimeavatar.ai/blog/real-time-ai-avatars-for-streaming-architects-of-live-digital-presence.md): Build a live AI avatar host with server\-owned sessions, moderated audience questions and a separate broadcast path\. Compare supported interfaces and costs\. - [AI Character Chat and Roleplay: Choose the Conversation You Want](https://realtimeavatar.ai/blog/building-engaging-realtime-ai-avatar-chat-experiences.md): Choose AI character chat for casual banter or longer roleplay\. Try practical prompts, check repetition and story control, and compare limits before paying\. - [Open Source Realtime AI Avatars: Assembling Production\-Ready Experiences](https://realtimeavatar.ai/blog/open-source-realtime-ai-avatars-assembling-production-ready-experiences.md): Exploring the landscape of open source components for realtime AI avatars and the significant engineering effort required to bring them to production\. - [Meta's Muse Realtime Avatar and Realtime Avatar: What's the difference?](https://realtimeavatar.ai/blog/meta-muse-realtime-avatar-vs-realtime-avatar.md): Meta introduced Muse Realtime Avatar on September 23, 2026\. Here's how the Muse experience compares with creating a live character for your own product\. - [The Architecture of Live AI Avatar Video: Realtime Presence, Not Just Playback](https://realtimeavatar.ai/blog/the-architecture-of-live-ai-avatar-video-realtime-presence-not-just-playback.md): Explore the engineering behind live AI avatar video\. Understand how to build dynamic, interactive digital characters for your applications using a realtime\. - [A Developer's Field Guide to Realtime Avatar APIs: Beyond Simple Video Streaming](https://realtimeavatar.ai/blog/a-developers-field-guide-realtime-avatar-apis-beyond-simple-video-streaming.md): For developers evaluating HeyGen API alternatives, understand the critical difference between streaming video and building truly interactive, full\-duplex AI\. - [Field Notes on Real\-Time Avatars: The Emergence of Live Digital Presence](https://realtimeavatar.ai/blog/field-notes-on-real-time-avatars-the-emergence-of-live-digital-presence.md): Explore the engineering behind real\-time AI avatars, digital characters that respond instantly to live input, enabling interactive experiences\. - [Architecting Avatars That Talk Back: Realtime Interaction Principles](https://realtimeavatar.ai/blog/architecting-avatars-that-talk-back-realtime-interaction-principles.md): Explore the engineering behind interactive AI avatars that talk back, focusing on the TIC Realtime Avatar platform's full\-duplex communication and visual\. - [Field Notes on Open\-Source Interactive AI Avatars: Realtime Challenges and Solutions](https://realtimeavatar.ai/blog/open-source-interactive-ai-avatars-realtime-challenges.md): Explore the landscape of open\-source interactive AI avatars, dissecting the real\-time challenges and practical steps for building embodied conversational\. - [Building Production\-Ready Interactive AI Avatars with a TypeScript SDK](https://realtimeavatar.ai/blog/building-production-ready-interactive-ai-avatars.md): Explore how to move from open\-source concepts to robust, real\-time AI avatar applications using a powerful TypeScript SDK\. - [Realtime Live Avatars: Decoding API Pricing for Production](https://realtimeavatar.ai/blog/realtime-live-avatars-decoding-api-pricing-for-production.md): Unpack the economics of live avatar APIs\. Explore TIC Realtime Avatar's usage\-based pricing, its "face layer" architecture, and how to build and ship\. - [Designing Interactive AI Avatar Chatbots: Beyond Conversation](https://realtimeavatar.ai/blog/designing-interactive-ai-avatar-chatbots.md): Field notes on building AI avatar chatbots that engage in natural, full\-duplex conversations and execute actions through integrated tools\. - [Architecting Realtime Interactive AI Avatar Chat Experiences](https://realtimeavatar.ai/blog/realtime-interactive-ai-avatar-chat-architecture.md): Building interactive AI avatar chats requires a blend of real\-time audio, expressive video, and intelligent agent logic\. This guide covers the essential\. - [Building Interactive AI Avatar Applications: Real\-Time Presence in Practice](https://realtimeavatar.ai/blog/building-interactive-ai-avatar-apps.md): Explore the architecture and implementation of interactive AI avatar applications\. Learn how to create real\-time, two\-way conversational experiences with\. - [How to test barge\-in in a realtime avatar app](https://realtimeavatar.ai/blog/testing-barge-in-in-a-realtime-avatar-app.md): Test realtime avatar interruptions with repeatable voice scenarios, recordings, and clear pass criteria before choosing an API or shipping your app\. - [Build a realtime avatar language\-practice app in Next\.js](https://realtimeavatar.ai/blog/build-a-realtime-avatar-language-practice-app-nextjs.md): Run a complete Next\.js avatar starter, turn it into a café roleplay partner, and test the conversation with a concrete rubric\. Includes source download and server\-side session policy\. - [How to benchmark realtime avatar startup and turn latency](https://realtimeavatar.ai/blog/how-to-benchmark-realtime-avatar-startup-and-turn-latency.md): A reproducible measurement protocol for avatar startup, first audible reply, interruptions and failures, with downloadable Next\.js instrumentation and reporting guidance\. - [Evaluating a LiveAvatar or Tavus alternative: a developer checklist](https://realtimeavatar.ai/blog/liveavatar-tavus-alternative-developer-checklist.md): Compare realtime avatar APIs by pipeline ownership, startup, conversational behavior, integration effort and total call cost\. Includes a runnable Next\.js evaluation app\. - [Kling AI Avatar API: video jobs and live conversations](https://realtimeavatar.ai/blog/navigating-the-kling-ai-avatar-api-landscape.md): What Kling Avatar v2's fal endpoint accepts and returns, how it differs from a live avatar session, and what to measure before choosing an integration\. - [Avatar Renderer vs Full\-Stack API: A Developer Integration Guide](https://realtimeavatar.ai/blog/renderer-or-full-stack-realtime-avatar-apis-compared.md): Choose an avatar renderer or a managed conversation API for your voice agent\. Compare audio inputs, tools, latency measurements and complete session costs\. - [Generated video that answers back: making a live avatar interactive, not just alive](https://realtimeavatar.ai/blog/generated-video-that-answers-back.md): A live avatar that performs on a loop is easy\. One that changes course when you ask is a scheduling problem — and per\-second pricing is what makes the fix affordable\. - [Integrating the AI Talking Avatar API: Principles of Realtime Embodiment](https://realtimeavatar.ai/blog/integrating-the-ai-talking-avatar-api-principles-of-realtime-embodiment.md): Explore the technical foundations and practical integration of an AI talking avatar API\. Understand the session architecture, timing measurements and usage costs behind live conversations\. - [Decoding Realtime Presence: An Engineer's Guide to the AI Avatar Video API](https://realtimeavatar.ai/blog/decoding-realtime-presence-an-engineers-guide-to-the-ai-avatar-video-api.md): Explore the core mechanics and practical applications of an AI avatar video API\. Understand how real\-time, interactive video streams empower dynamic user experiences, from customer support to immersive gaming\. - [Live avatars in 2026: a field guide to the research](https://realtimeavatar.ai/blog/live-avatars-2026-research-field-guide.md): How real\-time avatars became possible: the distillation recipe behind streaming video generation, the listening\-head turn, full\-duplex voice, and what the 2026 literature says is still hard\. - [The Core Mechanics of a Realtime AI Avatar Generator API: From Image to Embodiment](https://realtimeavatar.ai/blog/the-core-mechanics-of-a-realtime-ai-avatar-generator-api.md): Explore how a realtime AI avatar generator API turns a portrait into a conversational character, with session integration, timing measurements and usage costs\. - [LiveAvatar API billing: credits, conversation modes, and total cost](https://realtimeavatar.ai/blog/demystifying-heygen-live-avatar-api-pricing.md): Understand LiveAvatar FULL versus LITE credit units, then compare subscription allowances and complete conversation costs with Realtime Avatar\. - [Realtime avatar API pricing: included minutes, overage, and total cost](https://realtimeavatar.ai/blog/realtime-ai-avatar-api-pricing.md): Calculate live\-avatar API costs from monthly minutes and concurrency\. Catalog\-derived plan prices, worked examples, and an interactive calculator with explicit assumptions\. - [Agentic localization: how this blog stays multilingual without a translation team](https://realtimeavatar.ai/blog/agentic-localization-pipeline.md): Every post on this blog can ship in English, Chinese, and Japanese\. The translators are LLM agents; the editors are pull requests\. Here's the pipeline\. (also [zh](https://realtimeavatar.ai/blog/agentic-localization-pipeline/zh.md)) - [Looking for a HeyGen alternative? Decide what you're actually replacing first](https://realtimeavatar.ai/blog/heygen-alternative-for-realtime-avatars.md): A developer's guide to choosing a HeyGen alternative in 2026: video\-generation platforms vs realtime avatar APIs, what each costs per minute, and when each one wins\. - [HeyGen API vs LiveAvatar Pricing: What a Live Conversation Costs](https://realtimeavatar.ai/blog/heygen-api-pricing-explained.md): Compare HeyGen video generation with LiveAvatar's live conversation plans, credit conversion and RTA pricing using current official sources and clear limits\. - [Payload CMS vs\. a git\-based blog: what we chose for an agent\-written site](https://realtimeavatar.ai/blog/payload-cms-vs-git-based-blog.md): We researched running Payload 3 on Cloudflare Workers \+ D1, weighed it against keeping content in the repo, and picked the stack AI agents are best at maintaining\. - [Synthesia pricing in 2026 — and the alternatives when you need more than rendered video](https://realtimeavatar.ai/blog/synthesia-pricing-and-alternatives.md): Synthesia's plans, what the API actually includes, and the alternative paths — D\-ID, HeyGen, and realtime avatar APIs — when your use case is interactive rather than rendered\. - [The Architecture of Presence: Integrating a Realtime AI Avatar API](https://realtimeavatar.ai/blog/the-architecture-of-presence-integrating-a-realtime-ai-avatar-api.md): How to integrate a realtime AI avatar API: the architecture behind sub\-second, audio\-clocked conversational avatars, and what it takes to ship one in your app\. - [AI Boyfriend or Girlfriend: Choosing Text, Voice and Video Companionship](https://realtimeavatar.ai/blog/ai-companion-apps-with-a-face.md): Choose an AI boyfriend, girlfriend or companion by comparing text, voice and video, checking conversation continuity, and budgeting for regular use\. (also [zh](https://realtimeavatar.ai/blog/ai-companion-apps-with-a-face/zh.md)) - [Roleplay at scale: AI avatars for sales and corporate training](https://realtimeavatar.ai/blog/ai-avatars-for-corporate-training.md): The best training is rehearsal against a difficult human\. Realtime avatars make that rehearsal infinitely available, repeatable, and measurable\. - [What is a realtime avatar API? A builder's guide](https://realtimeavatar.ai/blog/what-is-a-realtime-avatar-api.md): From a single portrait to a character that answers in live, audio\-synced video: the moving parts of a realtime avatar API and what to evaluate before you build on one\.