Chronal vs PolyMetronome

Chronal is an Android metronome and tuner app for beginner and advanced musicians. Its timing tools include beat and subdivision visualization, tap tempo, custom time signatures, and an editor for creating rhythms. Two synchronized metronomes support polyrhythms, and conductor mode combines metronome and tuner functions. The app includes seven sound packs and can play audio files at custom tempos. A fullscreen mode uses large visuals intended to be visible from a distance. The tuner supports transposition for any instrument and tuning to a custom frequency. It can detect BPM from percussion through the microphone in real time, and provides an A4 reference tone with adjustable frequency. Chronal is ad-free, open source, and funded by donations. It is available through F-Droid and Google Play, with source code on GitHub. The listed F-Droid version requires Android 6.0 or newer. F-Droid lists microphone permission for use while the app is in use, while Google Play reports that the developer declares no data collection or sharing. Chronal is free; the product pages provide no stated support channel.

PolyMetronome is a metronome for musicians building practice around complex rhythms. Simple Mode covers time signatures from 2 to 32 beats, tap tempo, subdivisions, and visual beat indicators. Poly Mode runs two metronomes together, with separate beat counts, volumes, stereo positions, and sounds. Alphabet Mode provides 32 subdivision patterns for 16th-note and triplet figures, with notation and multi-bar loops. Score Mode lets users assemble multi-section compositions with individual tempos, repeat counts, and speed-training settings, then organize scores in folders and sync them. Bar Muting can silence beats in cycles or randomly at an adjustable probability; Speed Trainer moves from a starting BPM to a target through linear or stepped changes. Practice Log records dates, notes, BPM, and duration. The app includes 13 sounds, beat flashes, vibration, beat-position indicators, two themes, and six languages. It runs on Android, iOS, and the web; the web app supports Chrome, Firefox, Safari, and Edge. The free plan is free and includes Simple Mode.