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How Splash compares, honestly

Eight period trackers, the same questions for each: what it costs, whether you need an account, where your logs live and what you can share.

In short: Splash, Flo, Clue, Natural Cycles, Stardust, Apple Health and Euki differ most on three things: what is free, where your data lives, and how sharing works. Splash is free with no paid tier and keeps data on your phone. Natural Cycles is FDA-cleared contraception; Splash is not. Each comparison is dated and sourced, and was reviewed on 28 October 2026.

Last reviewed against each app’s own pages and Mozilla’s July 2026 review.

Want to see it for yourself? Splash opens in your browser with no sign-up, so you can try it beside the app you use now.

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Period trackers at a glance Last checked
FeatureSplashFloClueNatural CyclesStardustApple HealthEukidrip
CostFreeFree + PremiumFree + PlusSubscriptionFree + subscriptionFreeFreeFree
No account neededYesAnonymous Mode–––Apple IDYesYes
Data stays on device by defaultYesNoNoNo–On device + iCloudYesYes
Partner sharingFreeBasic freePlus–––––
Doctor report or exportFreePremium–––PDF export––
Mozilla July 2026 reviewNot reviewed7 / 108 / 10Not reviewed2 / 10Not reviewed10 / 10Not reviewed
AndroidBrowser and Google PlayYesYes––NoYesYes

Where Splash wins

  • Free, all of it. Partner sharing and the doctor report are free; elsewhere they sit in Premium or Plus.
  • No account. Open it and start. Euki and drip skip it too; Flo offers an Anonymous Mode.
  • On your phone by default. Logs stay on the device unless you turn on encrypted sync or partner sharing.

Where it counts

  • Partner sharing, encrypted. Your partner sees only the categories you tick, unlocked on their phone.
  • Bring your history. Import a Flo or Clue export, read on your phone, and keep both apps while you decide.
  • Installs in seconds. No app store and no sign-up. Add it to your home screen from the browser.

A dash (–) means we could not confirm it from a public source. Natural Cycles is FDA-cleared contraception; Splash is not contraception.

Head to head

  1. Splash vs FloFlo has a far larger expert library, native apps and an Anonymous Mode. Splash gives you its doctor report, symptom guide and full library free, and needs no account at all.
  2. Splash vs ClueClue has named clinician authors, years of research partnerships and EU (GDPR) jurisdiction. Splash gives you sharing and every mode free, without an account.
  3. Splash vs Natural CyclesIf you want an app as your contraception, choose Natural Cycles (or another method), not Splash. Splash is for free, private tracking, sharing and learning.
  4. Splash vs StardustBoth are cute. Stardust leans into moon and astrology content; Splash leans into an ocean world, no account and published detail on how your data is protected.
  5. Splash vs Apple HealthIf you only use Apple devices and want something built in, Apple’s Cycle Tracking is a strong, private choice. Splash adds partner sharing, a doctor report, a library and works on Android and any browser.
  6. Splash vs EukiEuki is one of the most private trackers available, and it is open source. Splash shares the local-first approach and adds optional encrypted sync, partner sharing and a doctor report.
Best Flo alternativesBest Clue alternativesBest private period trackers in 2026Short answers to common questions

Questions people ask when comparing period trackers

What is the best period tracker in 2026?

It depends what you value. For privacy, Euki scored highest in Mozilla’s July 2026 review. For a large library and community, Flo. For science-led content, Clue. On iPhone, Apple Cycle Tracking is free and built in. For free sharing, a doctor report and no account, Splash. Natural Cycles is the one built for contraception.

Which period tracker apps are free?

Euki, drip and Apple Cycle Tracking are free. Splash is free with no paid tier. Flo and Clue have free versions with paid tiers (Flo Premium, Clue Plus), and Natural Cycles and Stardust charge subscriptions for some or all features. Prices vary by region, so check each app’s own page.

Which period trackers work without an account?

Splash, Euki and drip work with no account. Flo offers an Anonymous Mode that needs no email. Apple Cycle Tracking uses your Apple ID. Clue needs an account to share your cycle. We mark a dash where we could not confirm the answer from a public source.

Which period tracker is FDA-cleared as contraception?

Natural Cycles is FDA-cleared as a method of birth control (De Novo, August 2018), and Clue has a separate FDA-cleared product, Clue Birth Control (510(k), February 2021). Splash, Flo, Stardust, Apple Cycle Tracking, Euki and drip are not FDA-cleared as contraception. If you are avoiding pregnancy, use a method designed for that.

How do you keep these comparisons fair?

Splash makes one of the apps, so every claim about another app links to that app’s own page or an independent source, with the date we read it. A dash means we could not confirm the answer, not that a feature is missing. We use no affiliate links, and corrections are welcome at corrections@splash.care.

Sources

  1. Flo: Premium membership (free vs Premium table) accessed 2026-10-26
  2. Flo help centre: What is included in Flo Premium (posted 4 Oct 2024) accessed 2026-10-28
  3. Flo: Anonymous Mode FAQ accessed 2026-10-26
  4. Flo help centre: Do I need a subscription to access Flo for Partners? (posted 3 Oct 2024) accessed 2026-10-28
  5. Clue support: How much does Clue Plus cost? accessed 2026-10-26
  6. Clue support: How can I share my cycle using Clue Connect? accessed 2026-10-26
  7. FDA 510(k) K193330: BioWink GmbH (Clue Birth Control), Feb 2021 accessed 2026-10-26
  8. Clue on the App Store accessed 2026-10-26
  9. FDA: FDA allows marketing of first direct-to-consumer app for contraceptive use (Aug 2018) accessed 2026-10-26
  10. Natural Cycles help: How does the subscription work? accessed 2026-10-26
  11. Stardust (official site) accessed 2026-10-26
  12. Apple Support: Track your menstrual cycle (Cycle Tracking), published 14 Sep 2026 accessed 2026-10-28
  13. Euki (official site) accessed 2026-10-26
  14. Mozilla Privacy Not Included: Euki accessed 2026-10-26
  15. drip (official site) accessed 2026-10-26
  16. Mozilla Foundation: Nothing Personal, period and ovulation trackers (16 Jul 2026) accessed 2026-10-28 (Mozilla’s page blocks automated fetching. The findings used here are checked against the two reports listed next to it.)
  17. DH Insights: Mozilla report reveals wide privacy gaps among popular period tracking apps (30 Jul 2026) accessed 2026-10-28

Each head-to-head page lists its own sources in full.

Compared enough? Try it.

Free, no account. Import your history from another app and keep both while you decide.

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