Your cycle data can reveal far more than the date of your next period
When an app knows more about your cycle than most people in your life do, asking who else can see that information is hardly unreasonable. A fertility or cycle-tracking app can end up holding some of the most personal details about your body: when you bleed, when you might ovulate, your temperatures, symptoms, fertile-window information and pregnancy-related notes. It is completely reasonable to want to know where that information goes and who can see it.
In the UK, health data receives additional legal protection as special category data under UK GDPR. You should not need to become a privacy-law expert before tracking your cycle, but it is worth choosing services that are clear about what they collect, why they use it and what control you keep. Read the ICO guidance on special category data.
“Sharing data” can mean several different things
A little clarity helps here, because not every kind of data sharing means the same thing. The phrase “sharing data” can sound alarming, especially when the data is about something as personal as fertility or your menstrual cycle. But it can describe several very different things.
An app may need specialist service providers to host or process information. It may let you connect to another health platform if you choose. It may use de-identified data for research with your consent. Or a business may sell or use information for purposes you were not expecting.
Those are not the same. Before you tap agree, the most useful questions are: what is being shared, with whom, why, under what permission and what control do I keep?
Six things to check before choosing a cycle or fertility app
1. What is collected?
Think beyond your email address. Your temperature, symptoms, cervical mucus, period dates, sleep and personal notes may all become part of your record.
2. Why is it needed?
A good privacy notice should make it clear what the app genuinely needs to work and what you are choosing to add yourself.
3. Who receives it?
Look for service providers, analytics partners, research partners and optional integrations. A simple headline rarely tells the whole story.
4. Is information sold?
“Sharing” and “selling” are different. It is worth looking for a clear statement rather than assuming one means the other.
5. Can you revoke access?
If you connect another app or health platform, check how you can stop future sharing and what happens to information that has already moved across.
6. Can you delete or export your data?
You should be able to understand what happens if you decide to leave. Clear deletion and export options are practical signs that you still have meaningful control over your record.
Where Tempdrop stands
Here is the reassuring part. Tempdrop's latest privacy guidance is unusually direct: it says it does not sell or volunteer user data, and never has. Tempdrop also states that it fully complies with GDPR.
Like most connected apps, Tempdrop uses service providers to help keep the service running. Its guidance says it shares only the essential information those providers need for the app to function, rather than sharing information beyond that operational purpose.
Research is treated separately. With your explicit consent, Tempdrop may share anonymised health data for legitimate women's-health research. It says personal information is not shared for that research, and you can choose whether to opt in or out.
Tempdrop also supports optional connections such as Apple Health, Health Connect and some third-party charting apps. Those connections are your choice, so you decide whether you want those additional data flows.
You can read Tempdrop's privacy policy and its data questions guide directly.
Deleting your data and locking down the app
If you ever decide you are done with Tempdrop, you are not simply handing over your information forever. Tempdrop's current app guidance says you can delete your account from inside the app.
The account-deletion screen states that doing so removes identifying data associated with your account and that remaining retained data is irreversibly anonymised so it cannot be traced back to you.
If you want all associated data deleted rather than having remaining data anonymised, Tempdrop instructs users to contact its support team before deleting the account in the app.
You can also put another lock between your cycle data and anyone who picks up your phone. Tempdrop tells iOS users to enable Face ID and Android users to add Tempdrop to their device's App Lock.
Together with Tempdrop's no-sale policy, GDPR compliance, consent controls for research and limits on service-provider sharing, those are practical controls you can actually use rather than a vague promise that privacy matters.
Why this matters when choosing a fertility tracker
Choosing a fertility tracker is personal. It needs to work with your body and your routine, but it also needs to feel right when it comes to your information. Tempdrop combines overnight temperature tracking with a stated no-sale policy, consent controls, optional integrations and deletion options, so privacy can be part of your decision from the start rather than something you discover later.
For the difference between calendar predictions and measured cycle signals, read our guide to period tracking app accuracy.
Cycle-data privacy: quick answers
Is cycle data classed as health data?
Cycle and fertility information can reveal information about your health. UK GDPR gives health data additional protection as special category data.
Does Tempdrop sell or volunteer user data?
No. Tempdrop's current privacy guidance says it does not sell or volunteer user data, and never has. It says information shared with service providers is limited to what is essential for the app to function.
Can Tempdrop data be used for research?
With your explicit consent, Tempdrop says it may share anonymised health data for legitimate women's-health research. It says personal information is not shared for that research, and you can opt in or out.
Can I delete my Tempdrop data?
Yes. Tempdrop provides account deletion in the app. Its deletion screen says identifying data is removed and remaining retained data is irreversibly anonymised. If you want all associated data deleted rather than anonymised, Tempdrop says to contact support before deleting the account.
Can I add extra protection to the Tempdrop app?
Yes. Tempdrop advises iOS users to enable Face ID and Android users to add Tempdrop to their device's App Lock.
Does connecting Apple Health or another app change things?
Yes. An optional integration creates a new data flow. Check the permissions you grant and the privacy terms of the receiving platform as well as Tempdrop's own policy.
What is the simplest privacy check?
Ask what is collected, why it is needed, who receives it, whether it is sold, how you can revoke access and whether you can delete or export your record.
The bottom line
Your cycle data is personal, and wanting clear answers about it is not overthinking. Tempdrop gives you concrete things to assess: it does not sell or volunteer user data, limits service-provider sharing to what the app needs, makes research sharing consent-based and anonymised, and provides deletion and device-locking controls. That gives you something much more useful than simply being told that privacy is “important”. The point is to feel informed and in control, not to become a privacy expert overnight.
