The Solara Interval Timer is a free workout timer with fully customisable work and rest intervals, made to pair with the Solara training programmes.
Android only — iPhone is not supported. Android will warn you before installing an app from outside the Play Store. When prompted, allow installs from your browser, then tap the downloaded file again.
Prefer not to install anything?
Open the timer in your browser. On Android, tap the Chrome menu and choose Add to home screen; on iPhone, tap Share and choose Add to Home Screen.