Voice to text for Mac
Mumbli turns your Mac into a voice-first machine. Hold Fn, speak naturally, and polished text appears right where your cursor is — in any application. No dictation box. No copy-paste. No app-specific plugins. Just speak and type.Why Mumbli
Apple Dictation is built into macOS, but it has limits: no polishing, no custom vocabulary, no way to handle filler words or self-corrections. It works fine for short phrases but falls apart for longer dictation. Mumbli fills the gap:- Filler word removal — “um”, “uh”, and verbal tics are cleaned out automatically
- Self-correction handling — Say “at 4 pm, actually 3 pm” and get “at 3 pm”
- Grammar and punctuation — Light cleanup without rewriting your voice
- Custom vocabulary — Add names, jargon, and technical terms that speech engines get wrong
- Multi-language — Language detection is automatic, no switching needed
How it works
Hold Fn to record
Press and hold the Fn key. A small overlay appears near your cursor showing that Mumbli is listening. Or double-tap Fn for hands-free mode.
Speak naturally
Talk at your normal pace. Audio is captured at 16 kHz mono and sent to an AI transcription service.
Speed matters
Mumbli offers two engine configurations:| Engine | Transcription | Polish | End-to-end |
|---|---|---|---|
| Standard | ElevenLabs Scribe | GPT-5.4 Nano | ~3-5 seconds |
| Fast | Groq Whisper | Groq Llama 3.1 8B | ~0.5-1 second |
Custom vocabulary
Speech engines struggle with proper nouns, brand names, and technical terms. Mumbli lets you add a custom vocabulary list in Settings. These words are:- Sent as hints to the transcription engine, biasing it toward correct spellings
- Injected into the polishing prompt so the LLM fixes any remaining errors
Works everywhere
Mumbli uses the macOS Accessibility API to inject text at your cursor. This means it works in:- Browsers (Chrome, Safari, Firefox, Arc)
- Email clients (Mail, Outlook, Gmail)
- Messaging apps (Slack, Discord, Messages, Telegram)
- IDEs (VS Code, Xcode, IntelliJ)
- Note-taking apps (Notes, Obsidian, Notion)
- Terminals and command lines
- Any app with a text field
Permissions
Mumbli needs three macOS permissions to work:| Permission | Why |
|---|---|
| Microphone | Audio capture for dictation |
| Accessibility | Injecting text at the cursor |
| Input Monitoring | Detecting Fn key presses |
Download Mumbli
Free and open source. macOS 13.0+ required.