Free & Open Source
Your voice.
Transformed.
Dictate into any app. Rewrite anything with AI. All private, all on your Mac. Nothing leaves your device.
Dictate into any app. Rewrite anything with AI. All private, all on your Mac. Nothing leaves your device.
You've selected: "The meeting is scheduled for tomorrow afternoon"
The floating toolbar · follows you across every app
Capabilities
Six capabilities. One lightweight app. No cloud required.
Apple's Speech framework transcribes your voice with precision. No internet, no servers, no data leaving your Mac.
Select text in any app and transform it using Apple's FoundationModels. Formal, concise, friendly — or your own instruction.
Via macOS Accessibility APIs, Mesmer works in every app — Slack, Xcode, Notes, Safari, everything.
Persistent listening without holding a key. Toggle with Fn + Space. A minimal pill UI confirms you're live.
Every transcription and rewrite is saved locally. Review and reuse past sessions anytime — privately.
All processing stays on your Mac. No accounts. No telemetry. No cloud. Just your words, staying yours.
How it works
Place your cursor anywhere. Open Mesmer's floating toolbar, tap the mic, and speak. Your words appear exactly where your cursor is — instantly, without copy-paste.
Highlight any text in any app. Mesmer's toolbar appears. Choose Formal, Concise, Friendly, or enter a Custom instruction. The selected text is replaced with the rewritten version — on-device, in seconds.
Every session is logged locally. Open History to revisit, copy, or re-inject any past transcription or rewrite.
Rewriting Personas
Choose how your words sound. Mesmer transforms the meaning stays, the tone changes.
"Hey, can we push the meeting?" → "I would like to request a reschedule for our upcoming meeting at your earliest convenience."
"I was thinking we could possibly maybe consider looking into this." → "Let's explore this."
"Action items remain outstanding." → "Hey, just a heads up — we still have a few things to wrap up!"
Type anything. "Translate to Spanish." "Turn this into bullet points." "Make it sound like Hemingway." "Add more technical depth." Mesmer passes your instruction directly to the on-device model.
Requirements
Open Source
MIT licensed. Run the script, get a DMG.
xattr -cr /Applications/Mesmer.app