Guide · Orientation

Cycle App for Couples: What Really Matters

There are lots of cycle apps. But if you want to use an app together, you have particular questions: Who sees what? What happens to the data? And does it still work if the cycle doesn't go by the textbook? This checklist helps you compare.

By Stefan Renzler · 11 October 2026 · approx. 5 min read

Why the choice matters

Very personal information ends up in a cycle app: period data, symptoms, mood, sometimes details about sex or wanting a baby. According to a 2023 survey commissioned by the Federation of German Consumer Organisations (vzbv), 92 percent of users consider the protection of this data rather or very important – but only 54 percent said they knew whether their data is passed on to third parties.

This is exactly the gap you can partly close before downloading. The following points apply to every app – including ours.

1. Privacy and business model

• How does the app make money? Subscription, advertising, passing on data? Especially with free apps, it's worth taking a close look at how they're funded.
• Is data sold or used for advertising? This should be stated clearly and be easy to find in the privacy policy.
• Which trackers and analytics services are built in?
• Where is the data stored and does the GDPR apply?

The vzbv advises reading the privacy policy before downloading. It should explain clearly what happens to the data.

2. Partner view: who sees what?

For an app for couples, this is the most important question. Good solutions get three things right:

• The person with the cycle decides what is shared – and can change it at any time.
• Private notes stay private. Not everything you record is meant for two.
• The partner gets something understandable instead of raw data: tips for everyday life are more helpful than tables full of symptoms.

How different the days in the cycle can be is explained in The cycle phases explained simply – and why understanding matters more than control in PMS in a relationship.

3. Honest about irregular cycles

Hardly any cycle runs exactly to the calendar. Check whether an app learns from your own entries and shows uncertainty openly – for example as a time range instead of a seemingly exact date. This is especially important during perimenopause, when the cycle becomes less predictable.

4. Clear statements on medicine and contraception

A reputable app says clearly what it's intended for – and what it isn't. Most cycle apps are neither a medical device nor a method of contraception. Be wary of promises like “never get pregnant unexpectedly again” or “get pregnant faster” if the app isn't expressly approved for that.

5. Export, deletion and access

Your data should belong to you. Check whether you can export it and easily delete your account yourself. Under the GDPR, you also have the right to find out what data is stored about you. A 2023 spot check by the vzbv and Stiftung Warentest showed that cycle app providers often failed to answer such access requests in full. The consumer advice centre of North Rhine-Westphalia (Verbraucherzentrale NRW) provides a template letter for this.

6. Made for your stage of life

Trying to conceive or going through perimenopause raises different questions than a “normal” cycle. Dedicated modes that address them are practical – without pressure and without false promises. More on this in Trying to conceive without pressure.

7. Costs and switching

• Does one subscription cover you both or does each of you pay separately?
• Is there a free trial in which you can try out the partner features?
• Can existing data be imported so you don't have to start from scratch?

And Ovulyx?

We built Ovulyx around exactly these questions – but we're also open about where its limits are:

• No selling of data, no analytics trackers. Cycle and diary data is never used for advertising; only non-personalised ads are shown.
• Data stored in Western Europe, processed in line with the GDPR. Export and account deletion right in the app.
• She decides what her partner sees – notes always stay private.
• Predictions based on your own entries, shown as a time range if the cycle is irregular. Dedicated modes for trying to conceive and perimenopause.
• One subscription for both of you; import from Flo and MyNFP.
• Ovulyx is not a medical device and not a method of contraception.

Other apps have other priorities, and that's a good thing. Take your time to compare – ideally with this list.

This article offers general information for everyday life and relationships. It does not provide a diagnosis and does not replace medical or psychological advice. If your symptoms are severe, please have them checked by a doctor. Ovulyx is not a medical device and not a method of contraception.