It's a timer app suitable for Tabata training.
All features are completely free to use.

Features:
- Quick start-up and comfortable operability. Create unlimited timers.
- Freely set warm-up, ready, workout, interval, cool-down seconds, and set counts.
- Customize colors, texts, background notifications, sounds, speeches, vibrations, screen flashes and icon badges.
- Dark mode
- Free

URL scheme:
tabatatimer://

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What is Tabata Training?

The Tabata Training workout requires 8 intervals of 20 seconds-all-out intensity exercise followed by 10 seconds of rest. Many of you might think how can one do 8 intervals in just 4 minutes? However, according to the research result by Professor Tabata, it is proven the best cardio workout as one can achieve both the aerobic and anaerobic exercises at the same time. Tabata training is a workout with high intensity and high efficiency.

Quoted from:
http://www.ritsumei.ac.jp/rs/category/tokushu/150715/