Technical Specs
Built with modern, privacy-respecting technologies that run locally on your device.
| Feature | Details |
|---|---|
| Languages | Rust (backend), TypeScript/React (frontend) |
| Build System | Taskfile for task management, pnpm for packages |
| Desktop Framework | Tauri (cross-platform) |
| Database | SQLite (local), optional Supabase integration |
| Extension Runtime | Sandboxed Deno for scripts, React for UI |
| Supported Platforms | macOS (stable), Linux and Windows (Q2 2026) |
| AI Providers | OpenAI, Anthropic, Deepgram, AssemblyAI, Soniox, Fireworks, Gladia, or local via LM Studio/Ollama |
| License | GPL v3.0 |
Bring Your Own Key
Use your preferred AI providers or run everything locally. No vendor lock-in, no forced subscriptions.
STT Provider Keys
Connect your own API keys for STT providers: Deepgram, AssemblyAI, Soniox, OpenAI Whisper
LLM Endpoints
Use your own LLM endpoints: OpenAI, Anthropic, or any OpenAI-compatible API
Run Local
Or skip keys entirely, run local models via LM Studio/Ollama with zero cloud dependency
Free Forever
Free tier runs forever with BYOK, upgrade to Pro only if you want our managed cloud services
Automation Hooks
Trigger custom workflows when events happen. No polling, no webhooks—just shell scripts that run automatically.
Shell Scripts
Shell scripts triggered automatically when recordings start or stop
Session Metadata
Receive session metadata as CLI arguments: resource directory, app identifiers, meeting context
External Integration
Trigger file processing, update external systems, or integrate with tools we've never heard of
No Polling
No polling, no webhooks to configure, just commands that run when events happen
Fully Extensible
Build custom UI panels, access app state, and create entirely new workflows with our extension system.
Custom UI Panels
Build custom UI panels using React and our component library (@hypr/ui)
Synchronized State
Access synchronized app state via TinyBase: sessions, calendar events, contacts, transcripts
Programmatic Control
Open tabs programmatically, create custom workflows, or build entirely new interfaces
Sandboxed Security
Extensions run in sandboxed iframes with validated security boundaries
Cross-Platform CLI
Manage sessions, export data, and automate workflows from the command line.
Export & Manage
Export sessions, manage data, trigger transcriptions, all from the command line
Scripting Ready
Designed for scripting: pipe output to other tools, run from cron jobs, embed in CI/CD
Session Management
Full session management: list, export, delete, create from audio files
Automation Interface
Your automation interface when the GUI isn't enough
API Access
Programmatic control over sessions, transcripts, and AI processing for enterprise integrations.
Coming Soon
REST API
REST API for programmatic control over sessions, transcripts, and AI processing
CRUD & Webhooks
CRUD operations, webhook support, AI trigger endpoints—all documented upfront
Enterprise Ready
Built for enterprise integrations and custom tooling
Frequently Asked Questions
Common questions about building with Char.
Can I build commercial products on Char?
Is the entire codebase open?
Can I run it completely offline?
What's the extension security model?
Do you train AI models on my data?
Ready to build?
Fork the repo, explore the codebase, and start building your own meeting AI.