Flo is a popular health app that provides menstrual cycle and ovulation tracking for women. It was co-founded in 2015 by Dmitry and Yuri Gurski in Belarus. Its ARR is about $220M.

As of February 2024, Flo has over 350 million downloads worldwide and 65 million monthly active users.

In mid-2024, it reached unicorn status with a valuation of over $1 billion. 17% of US women are MAUs, 60% Day 365 retention.