The comparison
The best period tracker apps, compared on privacy.
Most 'best period tracker' lists rank features. We rank the one thing the others skip: what each app does with your cycle data. Here's the honest table.
Search “best period tracker app” and you’ll get lists ranked by widgets, charts, and star ratings. Useful — but they almost never answer the question that actually matters with health data: who can see my cycle, and what do they do with it? That’s the lens we use here.
Below is the short version as a table, then the deeper comparisons. For the full ranked write-up, see the best private period tracker apps in 2026.
Privacy at a glance
| App | Account needed | Where data lives | Sells / shares data |
|---|---|---|---|
| Dew | No | Device + private (E2E) iCloud | No — no server, no copy |
| Apple Health | Apple ID | Device + E2E iCloud | No |
| Euki | No | On device | No (nonprofit) |
| Drip | No | On device | No (open source) |
| Clue | Yes | Company servers | Shares for research/ads; GDPR-based |
| Flo | Yes | Company servers | Says no; settled 2021 FTC matter |
Summary based on each app’s public privacy policy and reporting as of 2026; apps change their practices, so verify before you trust. Deeper sourcing in the linked pieces.
How we judge “best”
“Best” isn’t one thing. The right tracker depends on which of these you weight most:
- Privacy — does your data leave your phone at all? This is our headline criterion, and the full framework lives on the private period tracker guide.
- Honesty of predictions — does it admit uncertainty, or fake confidence? See why predictions are wrong.
- Fit for your cycle — regular, irregular, PCOS, perimenopause. The irregular-cycle guide covers this.
- Calm, not clinical — does it feel like a quiet tool or a nagging dashboard?
App-by-app, the honest version
- Is Flo safe? — the biggest app, with the most complicated privacy history.
- Is Clue safe? — careful, GDPR-based, with caveats.
- Apple Health for period tracking — private, but a vault more than a tracker.
- Private alternatives to Flo — if you want Flo’s polish without the data trade-off.
- Flo vs Clue vs Stardust vs Dew — four apps, six questions, head to head.
Our honest take
We make Dew, so treat this as a stated bias, not a neutral verdict: we think the best period tracker is the one that can’t betray you — where the company never holds your data, so there’s nothing to sell, leak, or surrender. That’s a small category (Dew, Euki, Drip, Apple Health), and within it the choice comes down to feel, platform, and which extras you want. The big mainstream apps are more polished; the question is only whether that polish is worth your cycle living on someone else’s server.
The series
The full comparison series
Is Flo safe? An honest 2026 privacy review
Flo says it never sells your data — and in 2021 settled FTC allegations that it shared health data with third parties despite its privacy promises. Here's what's actually true in 2026, and what Anonymous Mode does and doesn't cover.
Read →
Is Clue safe? What the privacy policy actually says
Clue is often called one of the more private big trackers. That's mostly fair — with caveats. What Clue stores, what it shares, and where your cycle data really sits.
Read →
The best period tracker for irregular cycles (2026)
Irregular cycles break most apps' predictions. Here's what actually helps — and the trackers that handle PCOS, perimenopause, and unpredictable cycles without nagging you.
Read →
Private alternatives to Flo (that don't sell your data)
If you love Flo's features but not its data history, here are the private trackers worth switching to — ranked by exactly what happens to your cycle data.
Read →
How to switch from Flo to a private period tracker
Leaving Flo without losing your history. How to export your data, delete your Flo account for real, and start fresh on a tracker that keeps your cycle on your phone.
Read →
The best private period tracker apps in 2026
Six period apps, ranked by exactly one thing: what they do with your cycle data. No marketing speak. No tier lists. Just the privacy mechanic.
Read →
How to delete your period tracker data (Flo, Clue, Apple Health, Stardust)
Step-by-step removal for the four most-used trackers. Including the dark patterns that make deletion harder than it should be.
Read →
Flo, Clue, Stardust, Dew: a privacy comparison
Four trackers, the same six privacy questions. Where your data goes, who can see it, what's encrypted, and what's gone if you uninstall.
Read →
Common questions
Frequently asked
- What is the best period tracker app in 2026?
- It depends on what you weigh most. For maximum privacy with a calm, modern experience, an on-device tracker like Dew is the pick. For a nonprofit-built option, Euki. For open-source, Drip. For the most feature-rich mainstream app, Flo or Clue — with the trade-off that more of your data is processed on their servers. There is no single 'best'; there is the best for your priority, which is why we compare on the mechanic rather than a star rating.
- What is the most private period tracker app?
- The most private trackers keep data on your device and require no account: Dew, Euki, and Drip lead here. Apple Health is also genuinely private (on-device plus end-to-end encrypted iCloud) but is more of a data vault than a full tracker. The least private of the popular apps are the free, ad-supported ones, because their business model depends on processing your data.
- Are paid period trackers more private than free ones?
- Often, but not always. A paid app makes money from you rather than from advertisers, which removes the main incentive to sell data — a good sign. But 'paid' alone doesn't guarantee on-device storage or no third-party SDKs. Check the same questions regardless of price: account required, where data lives, third parties in the policy, and whether it works offline.
- Which period tracker is best for irregular cycles?
- For irregular cycles, PCOS, or perimenopause, look for an app that logs flexibly without forcing a 28-day model, doesn't nag with confident-but-wrong predictions, and shows your own history clearly. We cover the specifics in our guide to the best period tracker for irregular cycles.
The app
Try Dew. Quiet by design.
A private period tracker that lives on your iPhone. No account, no ads, no data sold — by design.
Join the TestFlight beta →Dew tracks cycles. It does not diagnose or replace a doctor.