Free & open source · MLX-AUDIO · macOS

Just talk.
MurMur types it.

A tiny menu-bar cat that turns your voice into text — instantly, on the fly, in any app and 30 supported languages. Everything runs right on your Mac.

Download for Mac See how it works
macOS 13+ · Apple Silicon & Intel · ~22 MB
Homebrew bshk-app/homebrew-tap 
brew tap bshk-app/homebrew-tap
brew trust --cask bshk-app/tap/murmur
brew install --cask murmur

Or trust the whole tap with brew trust bshk-app/tap.

Slack File Edit View Go Window Help Tue 13:42
# general Team-wide announcements
AP

Anya Petrova

Did everyone get a chance to try the new dictation flow?
MD

Marco Diaz

It types straight into the box — no copy-paste. And it fixes its own typos as it goes.
B i </>
EN ⌥ Space

befor thursdayinstant draft
before Thursdayrefined in a blink

Three keys. No friction.

⌥ Space

Hold the shortcut

One global hotkey, anywhere in macOS. The menu-bar cat wakes up and starts listening.

Just speak

Talk naturally. MurMur catches every word in real time — no “processing” spinner, no waiting.

text appears

It’s typed for you

Words land straight in whatever field has focus — Slack, Notes, your terminal, a code comment.

The dual-model trick

Fast first, then perfect

A lightweight model types an instant draft so you never wait. A split second later the accurate model catches up and quietly sharpens each word — fixing names, punctuation and homophones in place. You watch it tidy itself up.

Used libraries

Open-source pieces in the stack.

Pulled from MurMur’s Tuist and Swift Package dependencies: audio inference, model access, shortcuts, updates and optional diagnostics.

mlx-audio-swift MurmurKit MLXAudioSTT, MLXAudioVAD and MLXAudioCore for local speech recognition. swift-huggingface MurmurKit Hugging Face Hub client, repo IDs and local model cache. KeyboardShortcuts App Native macOS global shortcut recorder for push-to-talk. Sparkle App In-app updates with signed appcasts. PostHog App Optional anonymous diagnostics when a build key is configured.
mlx-swiftmlx-swift-lmswift-transformersswift-jinjaswift-collectionsswift-cryptoswift-nio
⌥

Works everywhere

Any text field, any app. No copy-paste, no separate window.

⚡

Real-time

Words appear as you speak. The draft never makes you wait for the spinner.

◴

Subtitle mode

No active field? The HUD grows into big on-screen captions for talks and demos.

⌘

Yours to bend

Open source. Remap the hotkey, pick a model, read every line of code.

On-device · private

Your voice never leaves your Mac.

No accounts, no cloud, no upload. Both models run locally on your machine, so transcription works on a plane, in a tunnel, or fully offline — and nothing is ever recorded.

  • 100% offline
  • No audio upload
  • Nothing stored
MurMur cat mascot

Speaks your language

Switch tongues mid-sentence. It keeps up.

Auto-detects the language you’re speaking — around 30 of them, from global majors to most of Europe — and even handles code-switching between two in one breath.

EnglishРусскийEspañol中文العربيةहिन्दीFrançaisDeutschPortuguêsItaliano日本語한국어NederlandsPolskiУкраїнськаČeštinaΕλληνικάSvenskaDanskSuomiMagyarRomânăSlovenčinaHrvatskiБългарскиEestiLietuviųLatviešuSlovenščinaMalti

Stop typing. Start talking.

Open source, private, and it lives quietly in your menu bar until you need it.

Download for Mac Star on GitHub