English | 简体中文
Record what your Mac is playing — every app or just one — optionally mixed with your microphone. A native macOS app: no virtual audio driver, no changes to your speaker or headphone setup.
- Three capture modes: system audio only, microphone only, or system audio + microphone mixed into one file.
- Pick a source: all system audio, or a single app that is currently playing.
- Formats: M4A (AAC) or WAV (24-bit).
- Waveform: drawn live while recording; after recording, click or drag on it to seek.
- Stays out of the way: listens through a Core Audio process tap, so your output device keeps working and what you hear is unchanged.
Get the latest Rotap-<version>.dmg from Releases and drag Rotap into Applications. The disk image is signed with a Developer ID and notarized by Apple.
Requires macOS 26 or later. The interface is in English and Simplified Chinese; it follows your system language, or pick one in Settings › Language.
| Permission | Asked when | Used for |
|---|---|---|
| System audio recording | The first time you record system audio | Reading the sound other apps play |
| Microphone | The first time you record the microphone | Recording your voice |
Recordings are saved only on your Mac (~/Music/Rotap by default, changeable in Settings). Rotap makes no network connections and uploads nothing.
Requires Xcode 26 or later.
make app # maintainer build: Developer ID signed, output at build/Rotap.appWithout the maintainer's certificate, build with an ad-hoc signature:
xcodebuild -project Rotap.xcodeproj -scheme Rotap -configuration Release \
-destination 'generic/platform=macOS' CODE_SIGN_IDENTITY=- DEVELOPMENT_TEAM= buildmacOS treats every rebuild of an ad-hoc signed app as a new app and asks for the permissions again.
make release / make install are the maintainer's release flow (signing, notarization, publishing a release) and depend on tooling outside this repository.
Audio/AudioRecorder.swift: the process tap and the microphone share one private aggregate device and therefore one clock. The real-time IO thread only mixes; a lock-free ring buffer hands the audio to a writer thread that encodes and writes it.Audio/Waveform.swift: the waveform is built while recording and stored in the file's extended attributes, so opening an old recording needs no re-analysis.Views/WaveformLayers.swift: waveforms are drawn with Core Animation layers, keeping the UI's CPU use low while recording.
MIT © 2026 MAX LIN