A private Stardust alternative for iPhone
HerFlow tracks your period, moods, and cycle phases without an account, and lets a partner or friends follow along with a random code.
| Feature | HerFlow | Stardust |
|---|---|---|
| Use without an accountNo email, phone number, or sign-in | Yes | NoAccount required |
| Data used to track youApp Store privacy label | None | YesPurchases, identifiers, usage data |
| Partner sharing without an accountNo sign-up for anyone | YesA random code is all it takes | NoPartner Mode needs a Stardust account |
| Free period tracking | YesNo ads, no time limit | YesPremium optional |
Checked on September 25, 2026, against the Stardust App Store listing and Stardust's own pages. Privacy labels are self-reported by each developer. See how HerFlow compares with Flo, Clue, Stardust, and Natural Cycles in the full comparison.
HerFlow is not a medical device or a contraceptive; its predictions are estimates. Stardust is a trademark of its owner, which is not affiliated with HerFlow.
Why people switch from Stardust
No account, ever
Stardust asks you to register before you begin. HerFlow works the moment you open it, with no email, phone number, or password.
Nothing used to track you
HerFlow has no ads, no analytics, and no tracking SDKs. Its App Store privacy label lists no data used to track you, where Stardust's lists purchases, identifiers, and usage data.
Made for the people who support you
Your partner or friends see your cycle day and phase, a plain explanation of what it may feel like, and daily tips on how to support you.
Switching from Stardust takes a minute
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Get HerFlow
Download it free from the App Store. There is nothing to sign up for.
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Add your cycle
Enter the start of your last period and your usual cycle length, and HerFlow shows your phase right away.
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Share, if you want to
Give your random code to your partner or someone you trust, and they follow your cycle with tips on how to support you.
Is HerFlow a good alternative to Stardust?
Yes, if you'd rather not create an account. HerFlow needs no sign-up, declares no data used to track you on its App Store privacy label, and never links your cycle to your name. It predicts your period and fertile window, logs moods and symptoms, and explains each phase of your cycle in plain language.
Can my partner or friends follow my cycle in HerFlow?
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. Nobody creates an account. Following someone is part of the People subscription, which starts with a free 7-day trial that needs no payment.
Does HerFlow need an account like Stardust?
No. There is no sign-up, login, or password, and HerFlow never needs your email, phone number, or Apple ID. You can start tracking the moment you open the app.
Try HerFlow on your iPhone
Free to track your own cycle. No account, no ads, no analytics.