Comparison

KeepCycle, Flo, and Clue

Flo and Clue are the two apps most people are choosing between. Here is how KeepCycle differs, with the parts that are genuinely to their credit left in, including the places where Flo's free tier matches our paid one.

Checked September 2026. Prices and policies change, and every claim below links to the source so you can check it yourself.

What has already happened

This is not a hypothetical. In 2021 the US Federal Trade Commission finalised an order against Flo Health for sharing users' health data, including the fact of a period or a pregnancy, with Facebook, Google and other third parties while telling users it was private. In August 2025 a federal jury in California found Meta liable under the California Invasion of Privacy Act for obtaining Flo users' menstrual and ovulation information through Meta's software inside the app. Google and the analytics firm Flurry settled before that trial; Flo settled during it. The settlements total $59.5 million and are still paying claims.

Flo has changed since. Anonymous Mode is real engineering, and it is free. But the reason it was needed is the reason this page exists: an app that holds your data on a server can share it, sell it, be breached, or be ordered to hand it over, and in Flo's case one of those has already happened.

Who can open it

There is a second question, separate from what a company does, and it is the one that matters most in a state that restricts abortion: who can get at the data if they want it. Data held on a server can be produced under legal process. Private digital records have already been obtained by warrant and used to prosecute an abortion in Nebraska. Data on a phone can be reached by anyone who can make you unlock it.

KeepCycle answers both the same way. There is no server, so there is nothing for a company to produce. And the app has its own PIN, not your phone passcode, with biometric unlock optional and off by default, so knowing the phone's passcode gets someone to a keypad and no further. This is not a promise we are asking you to trust. It is how the app is built, and it holds even if we wanted it not to. Flo and Clue both offer an in-app passcode as well; the difference is that with them the copy on the server is still there.

KeepCycle Flo Clue
Privacy track record Nothing to share and nothing to breach, by construction: there is no server and no account. FTC order in 2021 over sharing health data with Facebook, Google and others. Jury verdict against Meta in 2025 over the same data; Flo settled during the trial as part of $59.5 million in settlements. No comparable enforcement action. States publicly that it does not sell user data.
Where your data lives Only on your phone. There is no KeepCycle server, so there is no copy anywhere else. On Flo's servers by default. Anonymous Mode decouples health data from your identity, and an unregistered account keeps data on-device with reduced features. On Clue's servers, in Germany, under GDPR.
Can it be produced under legal process? No, because we hold nothing to produce. Data held on their servers can be subject to legal process. Data held on their servers can be subject to legal process, under German and EU law.
What opens it on the phone Its own PIN, free. Not your phone passcode; biometric unlock optional and off by default; re-locks when you leave. Optional in-app passcode or biometrics. The server copy remains either way. Optional in-app passcode or biometrics. The server copy remains either way.
Account required No. There is no sign-up, no email, no phone number. Optional. Anonymous Mode and unregistered use are free; sync and some features need an account. Yes for sync and full use.
Hide what the app is Yes, Pro. Stealth Mode gives it a neutral name everywhere, plus a notes, calculator, weather or utilities icon. No equivalent No equivalent
Encryption Encrypted on your device with a key derived from your own PIN. We cannot read it. Encrypted in transit and at rest on their infrastructure. Encrypted in transit and at rest on their infrastructure.
Ads Free: one non-personalized banner on the lock screen and the theme picker, never near your data. Pro: none. Free tier runs on prompts to upgrade to Premium. The app's store listings do not flag third-party ads. Free tier is ad-free.
Cycle and symptom logging Yes, free Yes, free. 80+ symptoms and events. Yes, free
Period and ovulation predictions Yes, free Yes, free Yes, free
Reminders Medication reminders are Pro. Flo includes this free, and we say so. Yes, free: periods, ovulation, birth control, medication, habits. Yes, free for cycle reminders.
Fertility charting (BBT, mucus, OPK) Yes, Pro Loggable free; symptom patterns and predictions are Premium. Loggable free; deeper analysis is Clue Plus.
Perimenopause Yes, Pro. A mode that tracks gaps and symptoms instead of a 28-day cycle. Yes Yes
Doctor summary export Yes, Pro. Generated on your phone. Premium, iOS only: a report of the last six months. Yes
Share with a partner Yes, Pro. A snapshot file with only what you tick, never a live link. Basic Partner Mode is free; more of it is Premium. Clue Connect
Pregnancy mode No Yes, free; detailed tracking is Premium. Clue Plus
Paid tier $1.99 a month. Around $10 a month in the US, or about $40 a year. In the region of $30 to $40 a year; varies by store.
What the paid tier buys Extra features only. Encryption, the PIN lock and full export are free and always will be. Cycle pattern analysis, expert video content, the doctor's report, the AI health assistant, detailed pregnancy tracking. Advanced predictions and analysis, pregnancy mode.
Works with no internet Yes, completely Partly; sync and much of the content need a connection. Partly; sync needs a connection.

The honest summary

Feature for feature, Flo's free tier is generous, and in places it matches or beats our paid one: custom reminders, basic partner sharing, a pregnancy mode, and a symptom list longer than ours are all free in Flo and some of them are Pro in KeepCycle. We are not going to pretend otherwise. Our edge is not the feature list. It is that there is no server, the app has a door of its own, it can look like a notes app, and Pro costs a fifth of Flo Premium.

That comes with a genuine cost, and you should know it before choosing: there is no cloud backup. If you lose your phone without exporting a backup, your history is gone. Flo and Clue can restore your data to a new device. We cannot, and that is the direct consequence of the thing that makes us private.

What we are not claiming

Clue is not the villain in this story. It is a German company under GDPR, it states publicly that it does not sell user data, its free tier has no ads, and it has no enforcement history we are aware of. If you want a cloud tracker, it is a reasonable choice, and we would rather say so than imply otherwise to sell you something.

Flo has changed since 2021. The FTC order and the 2025 verdict are matters of public record and worth knowing about, but Anonymous Mode is real engineering and the unregistered option genuinely keeps data on your device. We are pointing at a documented history, not claiming it describes the app today.

We have not audited their code. Everything in the table above comes from their own published material and public records, linked below.

The one number that is not close

KeepCycle Pro is $1.99 a month. Flo Premium is around $10 a month in the US. Both apps do broadly the same job, and ours does it without a server. Privacy being the expensive option has never made sense to us.

Try KeepCycle in your browser

Sources