Best period tracker apps: an honest comparison for 2026
There's no single best period tracker app; it depends on what you need. Apple Cycle Tracking is free and built in. Clue is science-led. Flo has the deepest content and pregnancy features. Natural Cycles is cleared by the FDA for contraception. Stardust is playful. Lulu focuses on mood patterns with no account.
How we compared them
We looked at what each app does, how it handles your data, how it's priced and who it suits. Competitor facts come from their own App Store listings, websites and public records, checked in October 2026. Lulu is our app, so read our take on it with that in mind: we've tried to describe it as plainly as the others.
The apps side by side
| App | Strongest at | Price model | Platforms |
|---|---|---|---|
| Apple Cycle Tracking | Free, built in, wrist-temperature ovulation estimates, deviation alerts | Free | iPhone, Apple Watch |
| Clue | Science partnerships, 200+ trackable items, symptom forecasts | Free plus Clue Plus | iPhone, Android |
| Flo | Content library, Pregnancy Mode, partner sharing, perimenopause tools | Free plus Flo Premium | iPhone, Apple Watch, Android |
| Natural Cycles | Hormone-free birth control cleared by the FDA, temperature-based | Paid subscription | iPhone, Android |
| Stardust | Moon, astrology, friend and partner syncing, playful tone | Free plus subscription | iPhone, Android |
| Maya | Simple tracking, daily expected-symptom estimates | Free with ads, optional paid plans | iPhone, Android |
| Lulu | Mood forecast by cycle phase, partner sync, doctor-ready PMS chart | 3-day free trial, then yearly Lulu Plus | iPhone |
Who each app suits
Apple Cycle Tracking: if you want free and simple
Already on your iPhone, free, private, and with Apple Watch Series 8 or later it estimates when you likely ovulated. No mood forecast or partner view. Full comparison.
Clue: if you love detail and science
Clue's research partnerships, inclusive voice and huge tracking menu make it a favorite for people who want to understand their body in depth. Berlin-based, under GDPR.
Flo: if you want everything in one app
Flo's content, pregnancy experience and partner features are the broadest in the category. Its privacy record includes a 2021 FTC order and a 2025 jury verdict against Meta over data from Flo users; Flo has added an Anonymous Mode since.
Natural Cycles: if you want hormone-free contraception
The only app here cleared by the FDA as birth control (since 2018). It needs daily temperature from a thermometer or a supported wearable and a paid subscription. Every other app on this list is not contraception.
Stardust: if you want fun and friends
Moon phases, astrology and syncing with friends make it social and cute. Its privacy history is mixed: TechCrunch disputed its encryption claims in 2022, and Mozilla's 2026 research found symptom data shared with an analytics firm.
Maya: if you want a simple free app
Maya is straightforward and free to use, supported by ads, with optional paid plans. Privacy International reported in 2019 that it shared data with Facebook; its maker said it stopped.
Lulu: if you want to understand your moods
Lulu predicts your period, fertile window and ovulation day, and learns how you usually feel in each phase from a one-tap daily check-in, with a heads-up before harder days. Symptoms are bunny drawings; there's a doctor-ready PMS chart, Apple Watch wrist temperature import, Apple Health, perimenopause mode, widgets and 9 languages. No account, and no Lulu server holds your cycle data. It's iPhone only and has no pregnancy mode.
Five questions to pick yours
- Do you need contraception? Only Natural Cycles is cleared for that. Otherwise, use a proper method.
- Do you want mood, body detail or just dates? Lulu for mood, Clue for detail, Apple for dates.
- Are you pregnant or trying? Flo, Clue and Natural Cycles have dedicated modes.
- How much does privacy matter? Check whether the company stores your cycle data, and read the App Store privacy label.
- Android or iPhone? Lulu and Apple's tracker are Apple-only.
Every tracker starts with averages and gets better as you log. Judge predictions after about three cycles, not one.
Frequently asked questions
What is the most accurate period tracker app?
Accuracy depends mostly on how regular your cycles are and how consistently you log. Apps that use temperature data (Apple Watch, Natural Cycles) can refine ovulation estimates.
Which period tracker doesn't sell your data?
Look for apps where the company never receives your cycle data, and check the App Store privacy label. See our private period tracker guide.
Is there a free period tracker app?
Apple's Cycle Tracking is free on iPhone. Clue, Flo, Stardust and Maya have free tiers with paid upgrades.
Which period tracker tracks mood best?
Clue and Flo let you log mood; Lulu builds its main feature around it, showing how you usually feel in each phase. See period tracker with mood.
Sources
- Apple Support: Track your period with Cycle Tracking
- Clue Period & Cycle Tracker on the App Store (US)
- FTC: FTC Finalizes Order with Flo Health (June 2021)
- Natural Cycles on the App Store (US)
- Privacy International: No Body's Business But Mine, how menstruation apps are sharing your data (2019)
This page is for information only and isn鈥檛 medical advice. If something worries you, please talk to a doctor.
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