Soso is made for a girl’s first period. Flo goes all the way to pregnancy and perimenopause.

Flo’s terms of service require users to be at least 13, or 16 in the European Economic Area and the UK. Under-13s are not allowed. Soso is rated 9+ on the App Store.

Not under Flo’s own terms, which set the minimum age at 13. A 10-year-old getting ready for her first period is exactly who Soso was made for.

Flo is a large, established app, but it was not made for children. It is for 13 and up, it also covers fertility and pregnancy, its App Store label lists data that may be used to track users across other companies’ apps and websites, and in 2021 the US Federal Trade Commission issued an order against Flo over allegations that it shared users’ health data with Facebook and Google. Soso is rated 9+, declares no tracking and keeps her cycle data off our servers.

According to the US Federal Trade Commission, yes. The FTC alleged that Flo shared health data from millions of users, such as the fact of a pregnancy, with marketing and analytics companies including Facebook and Google, after promising to keep it private. In 2021 it finalised an order requiring Flo to get users’ consent before sharing health data, to tell affected users and to have an independent review of its privacy practices. Flo neither admitted nor denied the allegations. In 2025 users took the same sharing to trial in California: Flo settled mid-trial, agreeing to pay $8 million without admitting wrongdoing, and the jury found Meta liable under California privacy law. The judge later refused Meta’s request to overturn the verdict.

No, Flo does not show ads in the app. Its App Store privacy label does list data that may be used to track you across other companies’ apps and websites. Soso has no ads and declares no tracking.

Flo is built to track periods once they start. Soso gives a girl who has not had her first period an estimate of when it may arrive, and narrows it as she logs the signs of puberty.

Yes, Secret Chats, an anonymous community. Flo says members under 18 see separate groups and that moderators check posts before they appear. Soso has no feeds and no chats with strangers.

No. There is no Soso account. Her cycle data is stored on her phone and never sent to our servers. If you turn on backup, it goes to your own iCloud or Google Drive.

No. Soso has no intimacy log, no fertility window and no pregnancy mode. It stays with puberty, the first period and the first years of cycles.

For an adult who wants fertility, pregnancy or perimenopause tracking, partner sharing or Wear OS. Those are real strengths, and Soso does not try to match them.