Where the log lives
What each company says about storage
Euki
- Company storage claim
- Euki’s FAQ says logs stay on the device, with no account or cloud copy. The homepage says there is no third-party tracking and that they do not collect personal data to sell or to use for ads. Company site
- Account required?
- No. The listing says there is no account or cloud copy.
- Free tier
- On October 16, 2026 eukiapp.org said the app is 100% free, with no paywalls. The listing’s Free tier line, checked October 23, 2026, says Yes.
- Ads data
- The listing’s Ads data line says No.
- Platforms
- iOS, Android
- Trade-off the company printed
- The PIN is optional and is not tied to an email or phone number. If you forget the PIN, the FAQ says you redownload the app and start over. If you lose the phone, the FAQ says there is no login that restores the log.
drip
- Company storage claim
- drip’s site says your data stays on the device. The project says entries stay on the device. Company site
- Account required?
- The listing does not describe an account. It says entries stay on the device.
- Free tier
- Free and open source. The listing’s Free tier line, checked October 23, 2026, says Yes.
- Ads data
- The listing’s Ads data line says No.
- Platforms
- Android (Google Play and a direct APK)
- Trade-off the company printed
- The listing’s What’s free block includes import, export, and password protection. drip does not describe a cloud copy that restores the log on a new phone.
Apple Cycle Tracking
- Company storage claim
- Apple says its health features are designed around privacy. The listing does not say that cycle logs never leave the phone. Company site
- Account required?
- Not stated on the listing.
- Free tier
- Included with the Health app on iPhone. There is no separate cycle-tracking subscription. The listing’s Free tier line, checked October 23, 2026, says Yes.
- Ads data
- The listing’s Ads data line says No.
- Platforms
- iPhone
- Trade-off the company printed
- What you see depends on your iPhone software and region. Cycle estimates in Health are not birth control and not a fertility diagnosis.
Read Your Body
- Company storage claim
- Read Your Body’s site describes a privacy-focused menstrual app and says you chart your own signs. The listing does not say the log stays only on the phone. Company site
- Account required?
- Not stated on the listing.
- Free tier
- The App Store listing says the app is free to download with in-app purchases. The publisher describes a free trial, then a monthly or annual payment. The listing’s Free tier line, checked October 23, 2026, says No.
- Ads data
- The listing’s Ads data line says No.
- Platforms
- iOS, Android
- Trade-off the company printed
- The listing says this app is not a certified birth-control device. Confirm the current price in the store.
A storage sentence is not “private enough”
This page does not score apps and does not call any of them legally or clinically safe. Euki’s homepage quotes Mozilla describing a period and pregnancy tracker. This guide does not add a Mozilla score. How facts are chosen is on the editorial policy.
Where else to look
The full cycle shelf is Cycle & period tracking.How to choose a period tracker starts from the job, not from storage.Clue is a different model: its homepage says you can create a free account. Clue’s Ads data line says No. The privacy block says tracked health data is never shared with or sold to advertisers, and that Clue uses usage and device data to measure its own ads.