Clue Alternative: What Changes If You Switch

Before you look for a Clue alternative, read what Clue already publishes, because it rules out several of the things people usually leave an app for. Clue's privacy policy, last updated 14 July 2026, states that all data is securely stored on servers located in the European Union, that profile data is stored separately from health data, that the health data tracked in the app is never shared with or sold to advertisers, and that a request for complete deletion of your data is actioned within one month. That is a comparatively strict published position. So the useful question is not "what else is there" but "what am I actually gaining by moving, and what does the move cost me" — and there are only three answers that survive being asked that way.

Everything below about a named app is taken from that company's own published document and written as reported speech, because no outsider can test a company's engineering. Where a fact would be useful and no published document supplies it, this page says so instead of guessing.

What you would be giving up

Start with the thing being left, in its own words. Clue's policy states that creating a Clue account processes personal data such as a username, date of birth and email address. It states that all data is securely stored on servers in the European Union, and that profile data is stored separately from health data — which is a design decision rather than a promise, and a meaningful one, because it means the identifying half and the sensitive half are not sitting in the same place. It states that the health data tracked in the app is never shared with or sold to advertisers. And it states that a request for complete deletion of your data is actioned within one month.

Set that against the regulator's own summary of the category. When the UK's Information Commissioner's Office reviewed period and fertility apps in 2024, it reported that no serious compliance issues or evidence of harms were identified, while urging developers to prioritise privacy. That is the counterweight to the general anxiety this genre runs on, and it is worth holding in mind before deleting a year of history over a feeling.

None of that decides anything for you. It just means a move should be made for a specific gain, named out loud, rather than for a vague sense that something else must be safer.

Reason one: you want no account at all

This is the strongest reason, and it is structural rather than moral. An account exists so data can live somewhere other than your phone. Clue's policy states that creating an account processes a username, a date of birth and an email address; whatever is done with those afterwards, they exist, and they exist on somebody else's computer.

The published alternatives describe a different shape. The drip privacy policy states that there is no collection of usage data or personal information, no ads and no spyware, that menstrual cycle data is stored locally on the device and cannot be accessed by other apps, that deleting the app data in settings or uninstalling removes it, and that the source code can be read to check that all of this is true. Euki's privacy policy, effective June 2024, states that it does not collect any personal or other information from users, including through their use of the app, except for information a user voluntarily sends by contacting support, and that the app does not track its users to provide targeted advertising.

What it costs you. Everything an account buys. No copy exists anywhere else, so a lost or wiped phone is a lost history unless you exported it. And no page can tell you whether the features you actually use every day exist in the app you move to, because features change with every release and this page is not a review.

Reason two: you want nothing transmitted at all

Close to the first reason but not the same one. "No account" is about identity. "Nothing transmitted" is about traffic — the wish that no request leaving your phone should contain anything about your cycle.

Two things are worth knowing before you chase it. The first is that on-device storage and no transmission are not automatically the same thing, and the honest example comes from drip's own policy, which states that an automatic cloud backup may still take place depending on your device settings. An app can store everything locally and still end up copied to a phone backup you set up years ago and forgot about. The second is that "nothing transmitted" is testable by you and by nobody else: put the phone in airplane mode and use the app for a day. If logging, history and predictions all still work, the arithmetic is on the device.

If you have an iPhone, the option already installed is worth naming. Apple's guide says you can log menstrual cycle information in Health to get period and fertile window predictions, and that the log covers period days, flow level, symptoms, spotting, basal body temperature and more; it adds that an Apple Watch can be used to help log it, and that Siri can log a period start on supported models.

What it costs you. Usually sync. If nothing is transmitted, nothing arrives on your other device either, and moving to a new phone becomes a manual job you have to remember to do.

Reason three: you want it free, with no upgrade path

This one is real, and this page cannot answer it. Prices change, they differ by region, and any figure written here would be wrong within a year and would sit here being wrong. Whatever any tracker costs, its own store listing is the only current answer, and a comparison article that names a number is telling you something it has not checked today.

What can be said is narrower. Some trackers publish policies describing no ads and no collection of personal data at all, which is a statement about the business model rather than about the price, and it is the part that has consequences for your data. An app funded by advertising has a reason to want more of you; an app that says it collects nothing has told you where its money is not coming from. Whether that means it stays free is a different question, and nobody can answer it for the future.

What it costs you. Possibly nothing, possibly the features that were behind the upgrade. You will only find that out by using the thing.

How to leave without losing your history

The order matters more than the destination. Do these in sequence, and do not skip the first one because it is boring.

1. Export first, while you still can. Your cycle history is the only real input any prediction has. Get it out as a file, open the file to check it actually contains what you think, and put it somewhere that is not the phone you are about to change.
2. Write down the numbers that matter. If the export is a spreadsheet you cannot easily read, the start dates are the part worth saving by hand. Put your last few into the cycle length calculator and it will give you your own average and how much it moves — the number a new app spends months rediscovering. Keep it on a printable period tracker if you would rather have it on paper, where no migration can eat it.
3. Delete the account, not just the app. These are different objects. Clue's policy states that a request for complete deletion of your data is actioned within one month, so this step has a clock on it, and the clock only starts when you ask. How to delete period tracker data covers what a request has to say and where to send it.
4. Then delete the app. Last, not first. Deleting the icon removes the copy on your phone and does nothing about any copy held elsewhere — what deleting the app actually removes is the whole of that argument, and it is the step people get wrong.
5. Bridge the gap. A new app knows nothing for the first few cycles, and its predictions will be poor until it does. In the meantime the period calculator will take your last start date and your own average and give you a window with the uncertainty printed next to it, which is what a prediction honestly is.

What this page will not tell you

Which app is better. Ranking companies by trustworthiness would mean testing claims that nobody outside those companies can test, and the ranking would be a guess wearing the clothes of a service. What is here instead is what each one publishes, so you can weigh documents rather than reputations.

It is worth saying what that means for the commonest move of all, which is from one account-based tracker to another. Flo's privacy policy, effective 9 April 2026, states that it does not sell or rent personal data for money, that an account can be deleted in the app's settings, that a deletion request is handled within one month, and that complete deletion from backup systems may take 90 days and cannot be undone once begun. Read next to Clue's, that is a promise of a different shape rather than a smaller quantity of data, and swapping one for the other is a change of company rather than a change of architecture. What Flo and Clue each publish about your data sets the two documents side by side properly, and the honest field of Flo alternatives takes the question from the other direction.

It also will not tell you whether any app has a feature you rely on. Features change every release; a policy changes rarely and is dated when it does. That is why this page quotes policies and not feature lists.

Where Athena stands

One honest paragraph, because that is what it is worth. Athena is the app this site is being built for, and it is in development: not in any store, nothing here for sale, nothing to sign up for. What works today is the free tools on this site, which run in your browser, and the writing. When it ships, cycle data is written to a private database on the phone, predictions are calculated on the device, and there is no account and no server copy of health data — but the app will send anonymous diagnostics to Firebase, meaning which features get used, crashes and device model, never anything you log, and this website uses IP-anonymised web analytics. Local-only also means no automatic backup: if the phone is lost and nothing was exported, the history is gone. That is the trade the architecture makes, and it is the same trade every on-device tracker asks you to accept.