Circuit A simple, extremely efficient HIIT timer.

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About I often run through the same timers in the gym, whether for HIIT cycles or timing planks and stretches. I wanted to build an app with a timer that was easy to see from anywhere and could easily be used between sets.

I worked with my friends at Shag City to develop custom sounds that add utility and delight to the app, even when you're exhausted from the last set.

Save your favorite circuits and start them with a single tap.

Quick defaults make it easy to jump into your favorite circuit the moment you open the app.

The Circuit logo is a dynamic element that reflects your current circuit's work, rest, and cooldown periods.

A simple calendar displays your circuit history and keeps you motivated.

Circuit comes with custom sounds designed to keep you on track. I worked with my friends at Shag City to create sounds that match the bouncy, friendly vibe of the app.

An app clip made it easy for customers to share and try Circuit without downloading the app.