Period tracker privacy ratings
Menstrual cycle and fertility tracking apps. Cycle data is sensitive health data.
8 period trackers are rated against 6 public criteria, and 8 have enough evidence for a letter grade. Of the 6 with a known jurisdiction, 4 are based in a Five Eyes country, and 6 in the wider Fourteen Eyes.
Open-source period trackers only · Criteria for this category · Suggest an addition · Markdown
| Name | Grade | Score | Data | Jurisdiction | Open source | No trackers or telemetry | No ads or data sales | Independent audit | Data stays on device | No account needed |
|---|---|---|---|---|---|---|---|---|---|---|
Open source menstrual cycle tracker for Android and iOS that supports the symptothermal method and keeps all data on the device. |
Grade B | 87 | 100% | Germany Fourteen Eyes | Yes | Yes | Yes | No | Yes | Yes |
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. |
Grade B | 87 | 100% | – | Yes | Yes | Yes | No | Yes | Yes |
Open source Android period calendar that estimates fertile days with the calendar method, with notes, symptoms and local backup. |
Grade B | 77 | 100% | – | Yes | Partial | Yes | No | Yes | Yes |
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. |
Grade C | 67 | 100% | United States Five Eyes | Yes | No | Yes | No | Yes | Yes |
Cycle Tracking feature in Apple's Health app on iPhone and Apple Watch for logging periods, symptoms and pregnancy, with period and fertile window predictions. |
Grade D | 47 | 100% | United States Five Eyes | No | Partial | Yes | Partial | Partial | Partial |
Period, ovulation and pregnancy tracking app with cycle predictions, symptom logging and health content, funded by Flo Premium subscriptions. An Anonymous Mode removes name and email from the account. |
Grade F | 20 | 100% | United Kingdom Five Eyes | No | No | Partial | Partial | No | Partial |
Period and cycle tracking app from Berlin-based BioWink, with predictions, symptom logging and health content, and a paid Clue Plus subscription. |
Grade F | 7 | 100% | Germany Fourteen Eyes | No | No | Partial | No | No | No |
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. |
Grade F | 7 | 100% | United States Five Eyes | No | No | Partial | No | No | No |
Questions
What is the most private option among period trackers?
No pick has been made yet. The table above is sorted by score, based on public evidence.
How are period trackers rated?
Each entry answers 6 questions: open source, no trackers or telemetry, no ads or data sales, independent audit, data stays on device and no account needed. Answers need links to evidence. See the full criteria.
Does jurisdiction matter?
Jurisdiction decides which laws can compel a provider to hand over data. Each entry shows its country and whether it is in the Five, Nine or Fourteen Eyes. The data a provider can hand over depends mostly on what it stores and who holds the keys. Read about jurisdictions and the CLOUD Act.