🏗️ This project's AI agent harness is built with Harness Engineering.
A macOS voice input tool — hold a hotkey to record, release to get polished text auto-pasted into any input field.
Local AI transcription → LLM text optimization → auto-paste. Private, fast, effortless.
- Press & Speak — Hold
Option+Space(customizable) to record, release to transcribe + optimize + paste. No window switching needed. - Privacy-First Local STT — Four AI engines (Whisper, SenseVoice, Paraformer, Moonshine) run entirely on your Mac via Metal GPU. Audio never leaves your device.
- AI-Powered Polish — LLM auto-corrects grammar, removes filler words, and structures your text. Built-in technical term correction (e.g. phonetic Chinese → "React"), with custom vocabulary support.
- Auto-Paste Anywhere — Optimized text is automatically pasted into your active input field — Slack, WeChat, VS Code, browsers, any app.
- 99+ Languages — 4 engines, 9 models, covering 99+ languages. The system recommends the best model based on your language.
- On-Demand Models — Lightweight app, download only the STT models you need. One-click switch, progress display, smart recommendations.
- ESC to Cancel — Cancel at any stage (recording, transcribing, optimizing) by pressing ESC.
- History — Review past transcriptions with original and AI-optimized text side by side.
- Custom Vocabulary — Add professional terms, names, and product names. Auto-learning detects corrections and validates via LLM.
- Dark & Light Themes — Dual theme support to match your preference.
- macOS 11.0+
- Apple Silicon processor recommended (for Metal GPU acceleration)
Download the latest .dmg from GitHub Releases, open it, and drag Input 0 into your Applications folder.
On first launch, macOS may show a security warning. Go to System Settings → Privacy & Security and click Open Anyway.
Input 0 needs these macOS permissions to work properly. The app will prompt you on first launch:
| Permission | Why |
|---|---|
| Microphone | Records your voice |
| Accessibility | Simulates Cmd+V to paste text into other apps |
Go to System Settings → Privacy & Security to grant each permission, then restart the app.
This step is required. Without an API key, voice transcription still works, but the AI text optimization (grammar fix, filler removal, structuring) will be skipped.
- Open Input 0 → Click the ⚙️ Settings icon in the sidebar
- Find the LLM API section
- Enter your settings:
| Field | Description | Default |
|---|---|---|
| API Key | Your OpenAI (or compatible) API key | (empty — must fill in) |
| API Base URL | Service endpoint | https://api.openai.com/v1 |
| Model | LLM model name | gpt-4o-mini |
Using a third-party provider? (e.g. Azure OpenAI, Groq, local Ollama, or any OpenAI-compatible API)
- Change the API Base URL to your provider's endpoint
- Set the Model to your provider's model name
- Enter the corresponding API Key
Click Test Connection to verify your API key works.
This step is required. You need at least one model to transcribe voice to text.
- Open Input 0 → Go to Settings → Model section
- The app recommends the best model based on your language setting — follow the recommendation or pick your own
- Click Download next to the model you want
- Wait for the download to complete (progress bar shown)
Which model should I choose?
| If you speak... | Recommended model | Size |
|---|---|---|
| Chinese | SenseVoice Small | ~228 MB |
| English | Whisper Large v3 Turbo | ~1.5 GB |
| Japanese / Korean | SenseVoice Small | ~228 MB |
| Multiple languages | Whisper Large v3 | ~2.9 GB |
| Want the fastest | Moonshine Base (EN-only) | ~274 MB |
| Want smallest download | Whisper Base | ~142 MB |
- Press and hold Option+Space (or your custom hotkey)
- Speak naturally
- Release the key — your text is transcribed, polished, and auto-pasted
That's it! 🎉
If a model download fails or gets stuck:
- Check your network — Models are downloaded from Hugging Face. If you're in a region where Hugging Face is slow or blocked, consider using a VPN or proxy.
- Retry — Close and reopen the app, then try the download again. Partial downloads will resume from where they left off.
- Disk space — Make sure you have enough free space. The largest model (Whisper Large v3) needs ~2.9 GB.
- Manual download — As a last resort, you can manually download model files and place them in:
See the model registry for exact file names and download URLs.
~/Library/Application Support/com.input0/models/<model-id>/
- Make sure at least one STT model is downloaded and selected
- Check that your Microphone permission is granted
- Check that Accessibility permission is granted (required for auto-paste)
- Verify your API Key is set correctly in Settings
- Click Test Connection to check the API is reachable
- If using a third-party provider, double-check the API Base URL and Model name
- Make sure no other app is using the same hotkey
- Try changing the hotkey in Settings
- Restart the app after changing the hotkey
| Model | Size | Best For |
|---|---|---|
| Whisper Base | ~142 MB | Fast & lightweight, good for daily use |
| Whisper Small | ~466 MB | Balanced accuracy and speed |
| Whisper Medium | ~1.4 GB | Excellent multilingual accuracy |
| Whisper Large v3 | ~2.9 GB | Highest accuracy, 99 languages |
| Whisper Large v3 Turbo | ~1.5 GB | Top accuracy for English & multilingual |
| Whisper Large v3 Turbo Q5 | ~547 MB | Quantized high-accuracy, balanced size |
| SenseVoice Small | ~228 MB | Best for Chinese / Japanese / Korean |
| Paraformer Chinese | ~217 MB | Chinese-optimized, ultra-fast inference |
| Moonshine Base (EN) | ~274 MB | English-only, ~5x faster than Whisper |
This project is licensed under CC BY-NC 4.0. You are free to share and adapt, but not for commercial use.