Input 0 is a free, open-source macOS app that turns voice into polished text with zero typing, using local AI transcription via Metal GPU and optional LLM polishing.
What is Input 0?
Input 0 is a voice-to-text application for macOS that runs entirely on your device. It takes spoken audio as input and produces clean, grammatically correct text as output. The app uses a global hotkey (Option+Space) to activate a minimal floating UI, transcribes speech locally via Metal GPU acceleration, and optionally refines the text with an LLM. It is developed by 10xChengTu and available for download on GitHub.
Key Features
- Global Hotkey Activation — Press Option+Space from anywhere in macOS to start recording; release to transcribe and paste.
- Local AI Transcription — Voice is processed on-device using Metal GPU; audio never leaves your Mac.
- LLM-Powered Polishing — Removes filler words, fixes grammar, and corrects 40+ technical terms by pronunciation (e.g., 'rui en te' → 'React').
- Auto-Paste — Transcribed text is automatically injected into the active application (Slack, VS Code, browser, etc.).
- 6 AI Engines, 12 Models — Choose from Whisper, SenseVoice, Paraformer, Moonshine, FireRedASR, and Zipformer CTC, supporting 99+ languages with automatic best-model recommendation.
- Custom Vocabulary — Add your own terms (names, brands, jargon) and the AI auto-learns from your corrections via LLM validation.
- Multi-Language Support — Covers English, Chinese, Japanese, Korean, Spanish, French, German, and 99+ others.
Who is it for?
- Developers — Dictate code comments, documentation, or commit messages without leaving the terminal or IDE.
- Writers and Journalists — Transcribe interviews or draft articles hands-free, with AI polishing to clean up speech artifacts.
- Professionals in Meetings — Quickly capture meeting notes or action items and paste them into Slack, Notion, or email.
What can you do with Input 0?
- Transcribe meetings and lectures — Hold Option+Space, speak, and release to get polished notes pasted into your note-taking app.
- Write emails and messages — Dictate a draft, let the LLM fix grammar and filler words, then auto-paste into your email client.
- Correct technical jargon — The AI understands pronunciation of frameworks like React ("rui en te"), Vue, Node.js, and more, making it ideal for tech professionals.
How does Input 0 work?
- Activate — Press and hold Option+Space anywhere in macOS. A minimal floating pill appears.
- Speak and Release — Speak your thoughts, then release the hotkey. Transcription happens locally via AI engine.
- Polish and Paste — An LLM refines the text (removes filler words, fixes grammar) and automatically pastes it into the active application.
Pricing
Input 0 is free and open source. There are no paid tiers, accounts, or subscriptions. The source code and releases are available on GitHub.
