The best cycle tracking apps and wearables in the UK

Two months of decent tracking data will do more for your appointment than any amount of reading. It is the difference between saying "I feel awful sometimes" and showing a clinician a chart where mood, sleep and focus fall off a cliff on cycle day 22 every single month.

That is the case for tracking. The case for choosing carefully is privacy.

Privacy first, because it matters here

Cycle data is health data. In the UK it is special category data under GDPR, which means it carries additional protection, but that protection is only as good as the company holding it.

Before you install anything, check three things. Where the data is stored and under which jurisdiction. Whether the company shares or sells data with third parties, which is usually buried in a privacy policy rather than the app store listing. And whether you can export and delete your data on request.

Prefer apps that offer local storage or genuine end to end encryption, and be sceptical of free apps with heavy advertising, because your data is very likely the product.

What to actually track

Keep it small enough that you will still be doing it in eight weeks. Six fields is plenty:

• Cycle day, counting day one as the first day of full flow
• Bleeding, heavy, medium or light
• Mood out of ten
• Sleep quality out of ten
• Focus or energy out of ten
• One line of context, such as a bad night, a big deadline, alcohol

Two full cycles is the minimum for a pattern to be visible. Three is better.

Apps versus wearables

Apps are cheap or free, and they capture the subjective data that actually matters for mood conditions such as PMDD, and for ADHD symptom variation. If you are tracking to have a better clinical conversation, an app is enough.

Wearables add objective physiology: resting heart rate, heart rate variability, skin temperature and sleep staging. Temperature shifts across the cycle are real and a wearable will often show your luteal phase clearly. This is genuinely useful if you want to see the physiological pattern rather than only your perception of it, and it is a significant outlay.

A wearable does not replace symptom tracking. It measures your body, not your experience, and for premenstrual mood conditions the experience is the clinical data.

What tracking is not

It is not contraception. Fertility awareness methods can be effective, but only when taught properly and followed strictly, and an app prediction is not the same thing.

It is not a diagnosis. It is evidence you bring to someone who can make one.

And it is not something to do forever. Track intensively for two or three cycles, get the answer, then stop or reduce it. Permanent self surveillance is its own kind of burden.

Bringing it to an appointment

Print or export a simple summary rather than handing over your phone. One page, three cycles, with the dips marked. A clinician can read that in thirty seconds, and it changes the entire tone of the conversation.

If your pattern shows severe mood symptoms confined to the luteal phase that clear once bleeding starts, that is the picture of PMDD and it deserves proper assessment. If your focus and organisation dip alongside it, ask about ADHD as well, because the two frequently occur together and are frequently treated separately when they should be treated as one picture.

Frequently asked questions

What is the best cycle tracking app in the UK?

The best one is the one you will still be using in two months, with a privacy policy you have actually read. Prioritise apps that let you record mood, sleep and focus alongside bleeding, that allow data export, and that do not share data with advertisers.

Are cycle tracking apps private?

It varies enormously. Cycle data is special category health data under UK GDPR, but protection depends on the company. Check where data is stored, whether it is shared with third parties, and whether you can delete and export it. Free apps supported by advertising deserve the most scrutiny.

Is a wearable better than an app for cycle tracking?

They do different jobs. A wearable adds objective measures such as skin temperature and heart rate variability, which show the physiological phases of your cycle. An app captures the subjective symptoms, which are what matter clinically for premenstrual mood conditions. For most people an app is sufficient.

How many cycles should I track before seeing a clinician?

Two full cycles is the minimum for a pattern to be visible and is the standard approach for identifying premenstrual disorders. Three gives a clearer picture. Bring a one page summary rather than raw daily data.