AITuber Kit — Open-Source 3D AI-Character Framework
Published · Researched 2026-09-20
Overview
AITuber Kit (https://github.com/tegnike/aituber-kit) is an open-source toolkit for building web apps that chat with AI characters — forked from pixiv's ChatVRM and grown into a full AITuber platform. It drives VRM 3D avatars (with motion-tag pose/gesture control), Live2D models, and PNGTubers through 17 LLM providers and 11 TTS engines, with YouTube live-comment streaming, idle auto-speech, face/presence detection, OpenAI Realtime mode, and even game-commentary via screen capture. Framing honesty: this is a framework for building AI characters, not a polished companion app — included because it's one of the most actively maintained open-source 3D AI-character projects and the practical route many 3D companions get built on.
Social standing
Where people talk about it: GitHub (1,109 stars, 217 forks), X (@tegnike — demo videos), Discord (linked from README), DeepWiki. Japanese developer community; GitHub Sponsors and Buy Me a Coffee supporters listed on the README.
Consensus verdict: the go-to open-source kit for "I want my own AI VTuber/companion" — deep feature set, real maintenance (pushed Sept 13, 2026), genuine users. But nobody should mistake it for a consumer companion: it's a kit you configure, with API keys and setup.
Key social/press moments:
- GitHub API, Sept 20, 2026: 1,109 stars, 217 forks, pushed Sept 13, 2026 — active.
- README (Japanese): custom license notice from v2.0.0; sponsor/partner list with dozens of named supporters.
- Paid priority implementation offered (support@aituberkit.com) — a real commercial surface.
Main praise:
- Breadth: 17 LLMs, 11 TTS engines, VRM + Live2D + PNGTuber, streaming/signage/game modes.
- RAG long-term memory + recent-conversation memory built in.
- One-click launch scripts (LAUNCH.bat/.command), Docker, Vercel/Cloudflare deploys.
Main complaints / failure modes:
- It's a toolkit: setup (Node.js, API keys, .env) is the price of admission.
- v2.0+ custom license: commercial use requires a paid license — "open source" with strings attached.
- Bundled Live2D model has strict terms (no AI training/input on its images, no commercial use).
Key specs
| Aspect | Detail |
|---|---|
| Developer | tegnike (open source; custom license from v2.0.0) — https://github.com/tegnike/aituber-kit |
| Platform | Web app (Node.js 24); Windows/macOS launch scripts; Docker; Vercel/Cloudflare |
| 3D tech | VRM 0.0/1.0 with motion-tag pose/gesture control; Live2D Cubism 3+; MotionPNGTuber |
| Voice | Voice input; 11 TTS engines (VOICEVOX, ElevenLabs, OpenAI, Azure, Style-Bert-VITS2, AivisSpeech…); OpenAI Realtime/Audio modes |
| Chat/brain | 17 LLM providers (OpenAI, Anthropic, Gemini, Groq, Mistral, DeepSeek, xAI, Ollama, LM Studio, Dify…); multimodal (camera/uploaded images); external WebSocket integration |
| Lip-sync | Not explicitly documented — UNVERIFIED |
| Expressions | Motion-tag driven poses/gestures; emotion-driven expressions UNVERIFIED |
| Memory | Recent conversation retained + RAG-based long-term memory |
| Status (Sept 20, 2026) | LIVE — pushed Sept 13, 2026 |
Pricing
- Source code: free for non-commercial/personal/educational use (custom license, v2.0.0+; observed on README Sept 20, 2026).
- Commercial use requires a paid license — exact terms/prices UNVERIFIED (contact support@aituberkit.com).
- Running costs are the user's own API keys (LLM + TTS providers).
Support reality
- Official support: GitHub issues; support@aituberkit.com; paid priority implementation.
- Community support: Discord + X; Japanese-language community primarily.
Verdict
- AITuber Kit is the builder's pick of this lane: the most practical open-source foundation for a self-hosted 3D AI character, with the deepest provider support and real 2026 maintenance.
- Don't recommend it as a companion app — recommend it as the kit a technical user builds their companion on. Pair it with the Project AIRI item: AIRI is the closer-to-a-product choice, AITuber Kit is the more flexible framework.
Sources & images
- Sources: GitHub repo (https://github.com/tegnike/aituber-kit); GitHub API counts (observed Sept 20, 2026); docs (docs.aituberkit.com); X @tegnike demo posts.
- Images (../images/): aituber-kit-01.jpg is the primary image — tegnike's own X demo video thumbnail showing the kit's bundled character in-app (verified visually). aituber-kit-02.jpg — third-party AITuber YouTube thumbnail with AITuber branding (supporting).