Open-source React components and runtimes for building AI chat
Stage
Startup
Not given
Founded
Not given
Not given
Based in
GB
US
Pricing model
Free trial
Open source
Pricing
14-day free trial, then €5.99/month or €59.99/year (2 months free on annual).
The core library is free and MIT licensed. assistant-cloud offers: Free ($0, 200 MAU included), Pro ($50/mo, 500 MAU included plus $0.10 per additional MAU), Enterprise (custom MAU pricing, contact for details).
Key features
Store goals, PBs, races, thresholds and constraints in one athlete profile
Connect to ChatGPT or Claude to bring athlete context into every conversation
Update your profile and have ChatGPT or Claude update Athmex automatically
Store injury history and training constraints
Record equipment and shoes
Track PBs and thresholds with dates
Streaming support for real-time chat output
Tool execution and integration
Thread persistence and history
Voice support
Generative UI rendering
Message attachments
Conversation branching
Multi-platform support (React, Vue, React Native, Ink)
Runtime adapter support (AI SDK, LangGraph, LangChain)
Fully customizable component composition
What makes it different
No need to re-explain your fitness and goals in every conversation
Works with the AI assistants you already use
Reliable athlete memory that you control and can correct
Does not store activity history, only athlete context
Works with any backend through pluggable runtime adapters
Complete source code available for customization via CLI
Production-ready runtime handling streaming, tools, and state
Free MIT license with optional paid cloud persistence
Athmex
assistant-ui