About Megaphone
Megaphone is a free, open-source dictation app for Mac that runs entirely on-device. It uses Apple's SpeechAnalyzer for transcription and on-device Foundation Models to clean up fillers, self-corrections, and punctuation before typing the result into any text field. The software is MIT-licensed and requires an Apple silicon Mac running macOS 26 Tahoe.
Review
Megaphone enters the dictation space with a specific focus: keeping all processing local. The app captures audio when you hold the Fn key, then transcribes and refines it using Apple's latest on-device models. No account, API key, or internet connection is needed after installation.
Key Features
- Press and hold Fn to dictate; release to insert cleaned text into any app, including terminals and code editors.
- Apple's SpeechAnalyzer transcribes audio in real time, while on-device Foundation Models remove filler words, resolve self-corrections, and fix punctuation.
- Application context detection adjusts formatting and vocabulary to match the active
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