Claude AI Interface
Built for Developers
Branch conversations, bring your own API key, and always know your usage. Free with your OpenRouter key — no message limits when you BYOK. An unofficial Claude interface that gives you control the official app doesn't.
What the official app is missing
We built the interface we wanted to use. Branching, BYOK, and clear limits — without the marketing fluff.
Conversation Branching
Fork any message into a new branch. Explore different angles without losing your original thread. A feature no official client offers.
Bring Your Own Key
Use your own OpenRouter API key for unlimited personal usage. Your key, your budget, your control. We never lock you in.
Transparent Limits
See your exact message count in real time. Fixed daily resets at midnight UTC. No opaque rolling windows or surprise cutoffs.
All Claude Models
Switch between Claude 3.7 Sonnet, 4 Sonnet, 4.5 Sonnet, 4.6 Sonnet, and Haiku models instantly. Including thinking modes.
The Professional Choice
Why developers prefer an unofficial interface
| Feature | Claude Official | ClaudeUI |
|---|---|---|
| Conversation Branching | Not available | Built-in |
| BYOK (Own API Key) | Not available | Supported |
| Usage Transparency | Hidden limits | Real-time counter |
| Model Switching | All models | All models |
| Context Window | 1M tokens | Full model context |
| File Uploads | 30 MB | 10 MB |
| Export Conversations | Limited | Full history export |
*ClaudeUI is an unofficial interface and is not affiliated with Anthropic.
Questions & Answers
The things you'd probably ask before signing up
Simple Pricing
One plan for platform usage, free forever with your own key.
Free + BYOK
Bring your OpenRouter key, chat with no platform limits
Get a key at openrouter.ai/keys.
Pro
For developers who need more than the free tier
Cancel anytime. No hidden fees.
vs. Claude.ai Pro
Claude.ai uses a 5-hour rolling window. We use a fixed daily cap so you can plan ahead.