Twiddle Chat is a mobile chat app for people who want to use their own API keys. No in-app subscription: you bring your own keys and keep full control over cost and privacy (provider terms apply). **Bring your own keys (BYOK)** Use your own API keys for Gemini, OpenAI, OpenRouter, and Anthropic—no in-app subscription. You keep full control over costs, pay only what you use with your provider, and benefit from a more privacy-friendly setup (your data goes only to the providers you choose; each provider’s terms and conditions apply). **Chat with multiple AI providers** Choose from Wikipedia (no API key needed), Gemini, OpenAI, OpenRouter, and Anthropic. Add your API keys in Settings and pick your favourite models. Model selection and favourites sync across devices. **Familiar chat experience** Send messages and get streaming replies. Tap bold words in replies to ask follow-up questions. Optional system prompt and reasoning toggle. Copy or regenerate responses, export conversations as text, and manage chats: rename or delete them. Stop generation anytime. **Wikipedia built in** Search Wikipedia and read summaries. Tap search results or highlighted terms to dive deeper. Single-article answers include a “View on Wikipedia” link. **Sync and control** Conversations and settings (model, system prompt, API keys) sync via iCloud. Your keys stay on your devices; the app talks directly to provider APIs.