Private and open-source alternatives to Flo
5 period trackers rated against the same public privacy criteria as Flo (Flo Period Tracker), with our picks first.
Why look for an alternative?
- Open source: no. Closed source.
- No trackers or telemetry: no. The Exodus report finds AppsFlyer, Google Firebase Analytics and Sentry in the Android app.
- No ads or data sales: partial. Funded by subscriptions with no in-app ads or data sales, but with consent device identifiers are shared with AppsFlyer and ad partners such as Meta and Google Ads to target Flo's own ads.
- Independent audit: partial. Flo holds ISO 27001 and ISO 27701 certifications and cites a third-party privacy audit, but no full audit report is public.
- Data stays on device: no. Cycle data is stored on Flo's servers, encrypted at rest but not end-to-end encrypted.
- No account needed: partial. An account is created on Flo's servers, but Anonymous Mode lets it be used without a name, email or other identifiers.
The alternatives
drip. Grade B
Open source menstrual cycle tracker for Android and iOS that supports the symptothermal method and keeps all data on the device.
Based in Germany (Fourteen Eyes). drip. scores 87 out of 100 (grade B) on the period trackers criteria.
Mensinator Grade B
Open source Android period tracker with custom colour-coded symptoms, cycle and ovulation predictions, and data export, with no sign-up and no network access.
Mensinator scores 87 out of 100 (grade B) on the period trackers criteria. It meets 5 of 6 criteria: open source, no trackers or telemetry, no ads or data sales, data stays on device and no account needed.
Periodical Grade B
Open source Android period calendar that estimates fertile days with the calendar method, with notes, symptoms and local backup.
Periodical scores 77 out of 100 (grade B) on the period trackers criteria. It meets 4 of 6 criteria: open source, no ads or data sales, data stays on device and no account needed.
Euki Grade C
Open source sexual and reproductive health app from a US nonprofit, with period tracking, reminders and health information. Data stays on the device, with an optional PIN.
Based in the United States (Five Eyes). Euki scores 67 out of 100 (grade C) on the period trackers criteria. It meets 4 of 6 criteria: open source, no ads or data sales, data stays on device and no account needed.
Stardust Grade F
Period tracking app with cycle predictions, symptom logging and moon-phase features, funded by subscriptions. Health data is stored against a random account ID, separate from contact details.
Based in the United States (Five Eyes). Stardust scores 7 out of 100 (grade F) on the period trackers criteria. It partly meets no ads or data sales.