HerFlow vs Flo, Clue, Stardust, and Natural Cycles
How HerFlow compares with Flo, Clue, Stardust, and Natural Cycles on accounts, tracking, free features, and sharing your cycle with someone you trust.
| Feature | HerFlow | Flo | Clue | Stardust | Natural Cycles |
|---|---|---|---|---|---|
| Use without an accountNo email, phone number, or sign-in | Yes | OptionalAnonymous Mode, not with Flo for Partners | NoAccount required | NoAccount required | NoEmail account |
| Data used to track youApp Store privacy label | None | YesPurchases, location, identifiers, usage data | YesIdentifiers | YesPurchases, identifiers, usage data | YesContact info |
| Free period tracking | YesNo ads, no time limit | YesFlo Premium optional | YesClue Plus optional | YesPremium optional | NoSubscription required |
| Share your cycle without an accountNo sign-up for you or the person following | YesA random code is all it takes | NoFlo for Partners links two Flo accounts | NoBoth need Clue accounts; sharing needs Clue Plus | NoAccount required | NoNC° accounts and a subscription |
Checked on September 25, 2026, against each app's US App Store listing (Flo, Clue, Stardust, and Natural Cycles) and their help pages. Privacy labels are self-reported by each developer and describe data that "may" be collected. Apps change, so check the current listing before you decide. If something here is out of date, email support@herflowapp.com and it will be corrected.
HerFlow is not a medical device or a contraceptive; its predictions are estimates. Flo, Clue, Stardust, and Natural Cycles are trademarks of their respective owners, who are not affiliated with HerFlow.
Why people choose HerFlow
A period tracker that never asks who you are, and makes it easy for the people you love to support you.
No account, ever
Start tracking the moment you open the app. There is no email, phone number, or password to hand over, so there is nothing to leak and nothing to forget.
Nothing used to track you
No ads, no analytics, and no tracking SDKs. HerFlow's App Store privacy label lists no data used to track you, and your data is never sold.
Sharing without sign-ups
A partner, friend, or family member enters your random code and sees your cycle day and phase, with daily tips on how to support you. Neither of you creates an account.
Free for your own cycle
Tracking your own cycle is free with no time limit and no ads. Only the person following someone else pays for People, after a free 7-day trial that needs no payment.
Comparison questions
Switching from a specific app? See HerFlow as a Flo alternative, Clue alternative, Stardust alternative, or Natural Cycles alternative.
Is HerFlow a good alternative to Flo or Clue?
Yes, especially if privacy and sharing matter to you. HerFlow works without an account, declares no data used to track you on its App Store privacy label, and never links your cycle to your name. A partner, friend, or family member can follow your cycle with just your random code, with no account on either side. The comparison table above puts HerFlow, Flo, Clue, Stardust, and Natural Cycles side by side.
How is HerFlow different from other period trackers?
Three things. It has no account, no advertising, and no analytics. Cycle sharing is built for partners and loved ones and runs on a random code rather than a name. And its guidance is written around the five phases of the cycle for both the person tracking and the person supporting. HerFlow is also made by one developer rather than a company, so support emails go straight to the person who wrote the app. If you are looking for a private alternative to the big period tracking apps, that is the gap HerFlow is built for.
Does HerFlow track me or show ads?
No. HerFlow has no ads, no analytics, and no tracking SDKs, and its App Store privacy label lists no data used to track you. Flo, Clue, Stardust, and Natural Cycles each list data used to track you on their App Store privacy labels.
Can my partner follow my cycle without creating an account?
Yes. Give them your random code, and once they enter it in their copy of HerFlow they see your cycle day and phase, with daily tips on how to support you. Neither of you signs up for anything. Following someone is part of the People subscription, which starts with a free 7-day trial that needs no payment.
Try HerFlow on your iPhone
Free to track your own cycle. No account, no ads, no analytics.