No period tracker is entirely perfect — but several are light-years ahead of the mainstream when it comes to protecting your data. Whether you prioritise offline use, anonymous sign-up or medical accuracy, there are safe options that don’t compromise your digital privacy.
Millions of women use period tracking apps daily — whether to anticipate PMS symptoms, track fertility or simply keep in tune with their cycle. But a recent warning from the University of Cambridge has cast serious doubts over how safe our health data really is.
The report, which examined the most popular period tracker apps, revealed that many are sharing sensitive data with third parties, including marketers, often without clear user consent. In some cases, information was being transmitted within seconds of opening the app.
So, what should you do if you still want to track your cycle — but don’t want your data harvested in the process?
The good news is, not all apps are built the same. A growing number of developers are prioritising user privacy, building tools that keep your information local, anonymous or at least heavily protected.
Here, L360 share 10 of the safest period tracking apps on the market — including what to be aware of, as no app is perfect.
Read more: How to protect your data while using period tracking apps
1. Euki
Privacy features: No account required, no cloud storage, no data tracking.
Availability: Free on iOS and Android.
Euki is privacy-first from the ground up. All data is stored on your device, not online in the cloud, and there’s no need to create an account. It’s been developed in partnership with the nonprofit Women Help Women and includes a ‘decoy mode’ — when you enter ‘0000’ instead of their PIN or passcode, the app presents a fake dashboard, diverting attention from your real data.
There are no ads, no logins and nothing shared in the background.
Things to consider:
- If your phone is lost or wiped, your data is gone — there’s no backup.
2. Flo (Anonymous Mode)
Privacy features: Anonymous tracking mode, optional account-free use.
Availability: iOS and Android.
Why it’s good:
Flo is one of the most comprehensive trackers available, offering fertility insights, symptom logs and partner features. It now includes an anonymous mode so you can use it without linking your identity.
Things to consider:
- Flo previously shared user data with advertisers (since stopped and settled legally).
- Some usage data may still be collected for analytics.
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3. Drip
Privacy features: Open-source, account-free, no internet access required.
Availability: Android (via F-Droid or APK) and iOS.
Drip is built by a feminist tech collective and prioritises transparency. It doesn’t require an account or internet access and doesn’t store or share your data.
Things to consider:
- No way to export or back up data.
4. Natural Cycles
Privacy features: Clear data policy, consent-based collection.
Availability: iOS and Android (subscription required).
Natural Cycles is CE-certified as a medical device and uses temperature data to track fertility with high accuracy. It’s especially popular among those seeking hormone-free birth control.
Things to consider:
- Requires account creation and stores data in the cloud.
- Subscription-based.
- Not fully anonymous; best for those comfortable with medical data handling.
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5. Apple Cycle Tracking
Privacy features: End-to-end encryption, local device storage.
Availability: iOS and Apple Watch only.
Apple has a strong reputation for user privacy. Your cycle data is encrypted and stored on your device by default, with optional cloud backup. Third-party apps must explicitly request access.
Things to consider:
- If iCloud is enabled, your data is still technically stored in the cloud.
- It doesn’t offer detailed fertility tracking or partner features.
6. Periodical
Privacy features: No ads, no tracking.
Availability: Android (via F-Droid).
This lightweight app does the basics — track periods, predict your next one — without touching your data. It doesn’t connect to the internet at all and has no ads.
Things to consider:
- Very basic interface and features.
- No backup or export functionality.
7. Read Your Body
Privacy features: Optional encrypted backup, no data sharing.
Availability: iOS and Android.
Run by a nonprofit and popular with fertility educators, Read Your Body is highly customisable and transparent. It’s ad-free and offers encrypted backup if you want it.
Things to consider:
- Requires a paid subscription (it offers a free trial for 30 days).
- Some features (like syncing across devices) require optional cloud use.
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8. Lady Cycle
Privacy features: Offline only, local storage
Availability: Android.
Simple, secure and very low-tech, Lady Cycle tracks your cycle without any internet access or logins. A good option if you want privacy with no frills.
Things to consider:
- Outdated interface.
- Limited to basic tracking — no symptom logs or partner features.
9. Spot On (Planned Parenthood)
Privacy features: Transparent about data use, anonymised analytics.
Availability: iOS and Android in the UK.
Created by Planned Parenthood, this app avoids commercial data sharing and offers a clear breakdown of how your data is handled. It’s inclusive, evidence-based and supportive.
Things to consider:
- Requires an account; data is stored in the cloud.
- Some anonymised data may be used for research purposes.
- US-centric content may feel less relevant for UK users.
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10. Ahyla (launching September 2025)
Privacy features: Anonymous sign-up, encrypted data, no data selling.
Availability: Planned for iOS and Android in the UK.
Created by a female-led team, Ahyla promises never to sell or share your data. It allows you to sign up anonymously and even includes a feature that sends your partner supportive notes based on where you are in your cycle.
Things to consider:
- It’s not yet released, so early users may encounter limited features or bugs.
- The app’s privacy in practice will need to be proven post-launch.
What to look out for when choosing a period tracking app
- End-to-end encryption
Your cycle data should be encrypted so no one, not even the company itself, can read it.
- Minimal data collection
Only give what’s necessary. Skip apps that demand your name, location or phone number — or provide false information.
- Clear privacy policy
Look for plain language explaining what’s collected, how it’s used and if it’s shared.
- No ad trackers
Avoid apps that sell your data to advertisers. Bonus points if they let you fully opt out.
- Full data control
You should be able to export your data or delete it permanently anytime.
- Legal compliance
Apps that follow GDPR or CCPA or have third-party audits take privacy seriously.
- On-device storage
Offline use or local storage means your info stays on your phone, not in the cloud.
Feature image: Canva
