Open-source breathing pacer
Breathly
Breathly by Matteo Mazzarolo is a small, open-source breathing pacer with preset and custom patterns. Its documented no-advertising, no-in-app-purchase model offers a useful comparison with subscription libraries.
By Matteo Mazzarolo · Sources checked
When it may fit
Consider it if you want to choose a pattern, follow the cues and finish a session without browsing a class catalogue. The editable timing is useful when a preset is close to what you want but needs a small adjustment.
What it offers [1][2][3][4]
- Preset techniques and an editable breathing pattern
- Custom phase timing in half-second increments and a session timer
- Visual pacing, audio cues and optional vibration on phase changes
What to weigh up
Compare the timing controls and cue options with your preferred routine. Open source makes the implementation available to inspect; it does not by itself prove effectiveness or guarantee the same experience on every device.
- This is Matteo Mazzarolo’s app; other products use the Breathly name.
- The developer says the F-Droid edition is not maintained directly by him, so release channels may differ.
Provider practice guidance
A complete contraindication list was not verified on the reviewed product pages.
Sources & verification
Based on developer documentation and store listings, checked on 2026-09-25. We have not hands-on tested this app. Prices refer to the stated store or plan and may change. Unknown means unverified, not absent. Product images are publisher-supplied; their appearance may vary by platform or version.
- Breathly: official product page — checked 2026-09-25
- Breathly: US App Store listing — checked 2026-09-25
- Breathly: Google Play listing — checked 2026-09-25
- Breathly: developer source repository and release-channel notes — checked 2026-09-25