The short story
Clue tracks periods, symptoms, energy, skin and mood, and turns them into patterns you can actually read. It was co-founded by Ida Tin, who popularised the word "femtech". Because the company is based in Germany, your health data is handled under the GDPR — one of the main reasons women switched to it after the 2022 debate about period data in the US.
Why we picked it
- Calm, non-pink design that treats you like an adult.
- Useful as cycles start to change in your late 30s and 40s: tracking symptoms over months makes it easier to talk to your doctor.
- Strong public stance on keeping reproductive health data private.
Good to know
- The most useful insights sit behind the paid Clue Plus subscription.
- It is a tracking tool, not a contraceptive or a diagnosis.
Facts last checked October 2026. Prices and policies change — please check the maker’s site before buying. We are not paid for this listing.