What Hers is
What is Hers?
Hers: Period Tracker Calendar is an iOS app for logging more than one person's cycle in a single calendar. You keep the calendar on your own phone — up to three people, each with their own color and their own predictions. Tracking one person is free. Hers Pro costs $15.99 a year and unlocks the second and third.
How is Hers different from Flo or Clue?
Flo and Clue are built around one body — one user, one cycle, with a lot of health content on top. Hers does less on purpose: it keeps two or three cycles easy to read on the same calendar. If you only need to track yourself, Flo or Clue will give you more. If you are keeping someone else's days as well as your own, they have nowhere to put them. A longer side-by-side with Flo, including the things Flo does better, is on its own page.
Is Hers free?
Tracking one person is free, with no ads and no expiry. Hers Pro is $15.99 per year and adds the second and third person, per-person reminders, home screen widgets, and themes.
What do I need to run it?
An iPhone or iPad running iOS 15.0 or later. Hers is available in 44 languages. Hers is not on Google Play. The app is rated 9+, and it does not ask for an account, an email address, or a phone number to start.
Will periods I log on my Apple Watch show up in Hers?
Yes, by way of Apple Health. A period logged in Apple's own Cycle Tracking — on your iPhone or on your Apple Watch — is saved to Apple Health, and Hers Pro reads period records from Apple Health when you connect it. Records already sitting in Apple Health from before are read in too, so you are not starting from an empty calendar.
Tracking more than one person
Is there a period tracker for two people?
That is what Hers is for. Most period apps assume one body per phone. Hers holds up to three people in a single calendar, each with their own color and their own predictions. You do not need two accounts or two phones — one person keeps the calendar, and both sets of days sit side by side.
Can I track my girlfriend's cycle and mine in the same app?
Yes. One of you keeps the calendar and logs both sets of days side by side. Hers predicts each person's next period and PMS window separately, so you can see when the two overlap before they arrive. Most period apps are built for one body; this is the case Hers was made for.
We both have PMS. Can we see when our cycles overlap?
Yes, and that is the reason the app exists. Hers predicts each person's period and PMS window separately and draws them on the same month, so you can see overlapping weeks in advance, instead of trying to figure them out afterwards.
Do periods really sync when you live together?
Whether periods really sync is still debated by researchers, and cycles that seem to line up can also be coincidence. Hers doesn't try to settle that or to make cycles line up. It predicts each person's period and PMS window separately and draws them on the same month, so you can see in advance when your weeks happen to overlap.
Can two friends or roommates keep one period calendar?
Yes. Hers does not assume the people in the calendar are a couple. Friends, roommates, sisters, a mother and a daughter all fit the same three slots. Whoever keeps the calendar logs everyone's days on their own phone, so there is nothing for the others to install and no account to share.
Is Hers made for lesbian couples?
Yes, and more directly than most. Apps that add a partner feature usually assume the partner does not have a cycle, and the wording is written for a boyfriend or a husband. Hers treats every person in the calendar the same way: two women, both tracked, both predicted, neither one just an observer.
Can I use it to keep track of my daughter's period?
Yes, and it is one of the more common ways people use it. Because you are logging on your phone rather than hers, it works best as something she knows about — a shared record rather than a quiet one. She gets her own color and her own predictions, and nothing is sent to her device or to anyone else's.
Is Hers a good period tracker app for teens?
It works well for a daughter who has recently started, with one condition worth being clear about: the calendar lives on your phone, not hers. She installs nothing and has no account, so this is a record the two of you keep together rather than one she finds out about later. Set up that way, she gets her own color and her own predictions, and you can see the hard week coming instead of being surprised by it. There is no feed, no ads, and nothing about her cycle is sent anywhere.
The other person, and your data
Does she have to install anything?
No. There is no account to connect, no invitation to accept, and nothing for her to download. You log her days on your phone, next to your own. That also means there is no shared link and no data passing between two devices — the calendar only ever exists where you keep it.
Will the person I am tracking get notifications on her phone?
No. She installs nothing and has no account, so there is nothing on her phone to notify her. Every reminder — including the ones about her cycle — arrives only on the phone that keeps the calendar. Because the app will not tell her, it works best when she knows you keep the calendar.
Is it okay to log someone else's cycle?
It works best when she knows. Hers keeps everything on one phone — no accounts, no sharing, nothing sent anywhere — so the record stays between the two of you. Setting the calendar up together takes a minute, and it makes this a shared thing rather than a quiet one.
Where is my cycle data stored?
Hers syncs through your own Apple Health and your own iCloud. There is no Hers server holding your cycle. There are no ads, no social feed, and no community timeline, so there is no version of this app where a stranger sees your calendar.
Is Hers a safe period tracker?
Safe in the one way we can actually promise: your calendar never leaves your phone. There is no account and no login, and we have no server for your entries to sit on — they are written to your own device and your own iCloud, where we cannot read them. What Hers does not give you is medical guidance or health content; for that, larger apps are better resourced than we are.
Does Hers sell my data?
No. Hers doesn't sell data, and you can check why: an app can only sell what it holds. Your cycle entries are never sent to us — we have no server for them to go to. They are written to your own device and your own iCloud, where we cannot read them. There is no account, so there is no profile to attach them to, and there are no ads in the app. Hers is paid for by Hers Pro, not by advertising.
How can I tell a period tracker won't sell my data?
Look at where your data lives and how the app makes money. If there is no account, no company server holding your entries, and no ads, there is nothing to sell. You can also open the app's App Store page and check the “Data Used to Track You” section: Hers has none.
What data does Hers collect?
Your cycle entries are not sent to us: they are written to your own device and your own iCloud, never to a Hers server. Hers has no account, so it never has your name, your email address or your phone number. What it does involve is the ordinary information Apple needs to run an app and a subscription — your device model, and the Apple ID a Hers Pro subscription is attached to. There are no ads and no third-party trackers in the app.
Why does it matter that Hers has no ads?
In-app ads are usually filled by ad networks that bid on your session, which means details like your device's advertising ID and IP address can be passed along each time an ad loads. Hers shows no ads, so there is no ad network inside the app and no auction running on your attention.
Is Hers covered by HIPAA? Can police or a court get my cycle data from Hers?
Hers is not a healthcare provider, so HIPAA does not apply to it — which is true of most period apps. What protects your calendar is how Hers is built: there is no account and no Hers server holding your cycle, so there are no cycle records on our side for anyone to hand over. Your entries live on your own phone and in your own iCloud. If you would rather nothing left the phone at all, you can turn iCloud sync off.
Still stuck?
If your question is not here, write to us — a real person reads every message. If you are comparing Hers with Flo, there is a longer side-by-side for that.