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drip vs Natural Cycles: catalog facts
drip	Natural Cycles
Free Free and open source.	Paid Subscription service; prices are not listed on the homepage.
Android, iOS	Android, iOS
All data stays on the device Supports the symptothermal method for fertility awareness	FDA-cleared as a birth control app Covers contraception, pregnancy planning, postpartum and perimenopause
No sync between devices Fertility features depend on careful manual tracking	Less effective than an IUD, with 93% typical-use effectiveness Requires regular temperature or biomarker measurements
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.