What is the best free period tracker in the UK?
Free choices in the UK are Apple Cycle Tracking (built into iPhone), Euki and drip (free, open source, local-only) and Splash (free, no paid tier, no account). Flo and Clue are free to start but keep some features in Flo Premium and Clue Plus. Natural Cycles is a paid contraceptive app. We make Splash, so every claim about the others is sourced.
On this page 5 sections
Which period trackers are really free?
| App | Free to use? | What costs extra |
|---|---|---|
| Splash | Yes, no paid tier | Nothing today. Partner sharing, doctor report, insights, every mode and the library are included |
| Apple Cycle Tracking | Yes (built into iPhone and Apple Watch) | Nothing. Apple devices only |
| Euki | Yes, funded by donations | Nothing. Open source, no sync |
| drip | Yes | Nothing. Open source, no sync or sharing |
| Clue | Free version | Clue Plus: sharing your own cycle, Conceive and Perimenopause modes, fuller pregnancy insights |
| Flo | Free plan | Premium: cycle patterns, expert courses, Health Assistant, Symptom Checker (not in the UK or EU), doctor report on iOS |
| Natural Cycles | No, subscription | Subscription for the whole app |
Prices vary by region and change, so we do not quote them. Check each app. Reviewed 28 October 2026.
What matters for a UK user?
- Symptom Checker. Flo says its Symptom Checker is not available in the UK or EU, so a Premium subscription would not unlock it here.
- NHS wording. Look for guidance that matches NHS and NICE, such as the NHS ranges for irregular periods and the UK pregnancy schedule. Splash’s library cites NHS, NICE, FSRH and RCOG, and its pregnancy checklist follows the NHS schedule in England. It is not affiliated with the NHS.
- Where your data goes. Clue is Berlin-based and under GDPR; Splash stores optional encrypted backups in the EU (Paris). Euki, drip and Splash without an account keep data on your device.
- Not contraception. Natural Cycles is FDA-cleared as birth control, and Clue has a separate FDA-cleared product. Free trackers are for understanding your cycle.
How do I choose?
- Want everything free, with sharing and a doctor report, and no account: Splash.
- Want the most private and simplest, and are fine with no sync: Euki or drip.
- Use iPhone and Apple Watch only: Apple Cycle Tracking.
- Want a very large library and community and are happy to pay for Premium: Flo.
- Value named clinician authors and EU jurisdiction: Clue.
Questions people ask
Is Flo free in the UK?
Flo has a free plan with period and ovulation predictions, symptom logging, a calendar and Secret Chats. Premium adds cycle patterns, expert courses, a Health Assistant and, on iOS, a doctor report. Its Symptom Checker is not available in the UK or EU. Flo offers monthly, yearly and Family plans, and prices vary by region.
Is Clue free?
Clue has a free version that remains available. Clue Plus, a paid monthly or yearly subscription, adds sharing your own cycle through Clue Connect, Conceive mode and Perimenopause mode, and fuller pregnancy insights. Pregnancy mode has a basic free version. Viewing a cycle someone shares with you is free.
Do free period trackers have adverts?
It varies. Mozilla’s July 2026 review found Period Calendar was the only one of six tested apps relying on advertising for revenue. Apple Cycle Tracking, Euki, drip and Splash have no subscription. Splash is not funded by advertising today, and its privacy policy says we would update it and ask for consent before any ad-related processing.
Is Splash really free?
Yes. There is no subscription, no paid tier and no in-app purchases, and every feature is included. Splash is a small independent project run by WhealBit in St Ives, Cornwall. If pricing ever changes we will say so clearly in advance, and you can export a full backup of your data at any time.
Sources
- Flo help centre: What is included in Flo Premium (posted 4 Oct 2024) accessed 2026-10-28
- Flo: Premium membership (free vs Premium table) accessed 2026-10-26
- Flo help centre: What is the price for a Flo subscription? accessed 2026-10-28
- Flo: Family plan accessed 2026-10-28
- Clue support: How much does Clue Plus cost? accessed 2026-10-26
- Clue support: What’s included in Clue Plus? accessed 2026-10-28 (Clue blocks automated fetching; read through a search excerpt.)
- Clue support: What is the free version of Clue Pregnancy mode? accessed 2026-10-28 (Clue blocks automated fetching; read through a search excerpt.)
- Clue support: What’s Clue Perimenopause mode? accessed 2026-10-28 (Clue blocks automated fetching; read through a search excerpt.)
- Natural Cycles help: How does the subscription work? accessed 2026-10-26
- FDA: FDA allows marketing of first direct-to-consumer app for contraceptive use (Aug 2018) accessed 2026-10-26
- FDA 510(k) K193330: BioWink GmbH (Clue Birth Control), Feb 2021 accessed 2026-10-26
- Apple Support: Track your menstrual cycle (Cycle Tracking), published 14 Sep 2026 accessed 2026-10-28
- Euki (official site) accessed 2026-10-26
- drip (official site) accessed 2026-10-26
- DH Insights: Mozilla report reveals wide privacy gaps among popular period tracking apps (30 Jul 2026) accessed 2026-10-28
Splash makes one of the apps mentioned here, so every claim about another app links to its own page or an independent source. Spotted something wrong? Email us and we will fix it and note the change.
Keep reading
- Free period tracker: what is really free
- Pricing
- Compare period trackers
- Flo alternatives
- Clue alternatives
- Is my period tracker data private?
- What is the best period tracker for irregular periods in the UK?
- Is there a period tracker that works without an account?
- How accurate are period tracker predictions?
General information, not medical advice. Splash is not contraception, not a medical device and cannot diagnose, and it is not affiliated with the NHS. If you are worried, talk to a GP, pharmacist or sexual health clinic. How we write and check content.
Free, with the features other apps charge for
Doctor report, sharing and every mode. No account.