Phrex HIIT Pulse

Phrex HIIT Pulse is an interval training timer built for people who want precise control over every second of their workout. No registration, no accounts, no internet connection required — everything runs and saves locally on your device.

Set your work duration, rest duration, number of rounds, and the app counts you through each phase with a clear visual countdown. Vibration alerts let you know when to push and when to recover, so you can stay focused on the effort instead of watching a screen.

Build multiple training circuits and save them for quick access. Each circuit stores its own work phase, rest phase, and round count independently, so you can keep a sprint circuit separate from a bodyweight circuit without resetting anything manually.

The timer screen shows the current phase, round progress, and remaining time at a glance.

There are no ads, no paywalls, and no hidden features gated behind a subscription. The app is built to get out of your way and let you train.