The world's leading intermittent fasting app.

Fastic turned intermittent fasting into a habit millions of people could actually keep. Founded in 2019, the app passed 50 million downloads and became the category leader, built on a subscription model and a growth engine we ran ourselves.

Health apps have a structural problem: the people who need them most are the people most likely to quit in week two. Retention is the product.

We built Fastic around one behaviour, the fasting window, and made it the simplest possible thing to start and the hardest thing to abandon. Everything else in the app existed to protect that loop.

The growth side was equally unglamorous: relentless creative iteration, onboarding tested to the screen, a paywall we rebuilt more times than I want to admit. That is how the category leader gets built.