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Clue vs Natural Cycles: catalog facts
Clue	Natural Cycles
Best for: People who want to track their menstrual cycle on their phone	Best for: People looking for hormone-free birth control or fertility tracking
Free + paid options Free app with a paid subscription for additional features.	Paid Subscription service; prices are not listed on the homepage.
Android, iOS	Android, iOS
Cycle predictions and personalised insights Available on both iOS and Android All 3 strengths for Clue Cycle predictions and personalised insights Available on both iOS and Android Science-based approach to content	FDA-cleared as a birth control app Covers contraception, pregnancy planning, postpartum and perimenopause All 3 strengths for Natural Cycles FDA-cleared as a birth control app Covers contraception, pregnancy planning, postpartum and perimenopause Works with an overnight band and other compatible devices
Some features require a subscription Sensitive health data is handled by a commercial service	Less effective than an IUD, with 93% typical-use effectiveness Requires regular temperature or biomarker measurements All 3 limitations for Natural Cycles Less effective than an IUD, with 93% typical-use effectiveness Requires regular temperature or biomarker measurements Pricing not listed on the homepage
Downloadable app	Downloadable app
Not open source	Not open source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for Clue helloclue.com play.google.com/store/apps/details apps.apple.com/us/app/clue-period-cycle-tracker/id657189652 Catalog checked September 23, 2026	Official website Full listing and sources Sources for Natural Cycles naturalcycles.com play.google.com/store/apps/details apps.apple.com/us/app/natural-cycles-fertility-app/id765535… Catalog checked September 24, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.