The short answer
Yes. Hers keeps up to three cycles in one calendar, on one phone.
Each person has their own color and their own predictions, laid over the same month. You can see at a glance when two of them overlap — which, if you have ever lived through two PMS weeks landing on the same days, is the whole point. There is no sign-up, no invitation and no pairing code, and nobody else has to install anything.
Two different shapes
Most period apps are built around one account holding one body. When they add a second person, it usually works by sharing: she installs the app, you install the app, you pair, and then you can see her cycle from your own phone. That is a real feature and for a lot of people it is the right one — but it is not the same as keeping everyone in one place yourself.
The last two rows go the other way, and they are not small. If what you want is for her to keep her own record and let you see part of it, a sharing feature does that and Hers does not. There is nothing to share in Hers, because there is only one phone.
Who ends up using it
Usually one person who was already the one remembering. A friend who texts the day before. A mother and a daughter keeping both months on one screen. Two sisters. Two people in one house who both menstruate and would like some warning before the same hard week arrives twice.
Apps that add a second person are usually written for a boyfriend or a husband, and the person following along is assumed not to have a cycle of their own. Hers does not work that way. Everyone in the calendar is tracked and predicted the same way — there is no owner and no follower, just people with cycles. Two women, two sisters, a mother and a daughter, two friends: the same three slots, no roles.
One thing about keeping someone else’s dates
Hers is built for people who keep each other’s dates on purpose. The friend who remembers, the mother who remembers, the sister who notices. A record kept about someone who has not agreed to it is a different thing entirely, and nothing here is designed to make that easier or to hide it. If the person whose days you are logging would be unhappy to learn you were logging them, this is the wrong app for you, and we would rather say so on the page than in the fine print.
What Hers cannot do
It is iPhone only, and no Android version is planned. If the phone in question runs Android, this page ends here.
Three is a real limit. If you are keeping records for more people than that — a clinic, a team, a whole family of five — Hers is not the tool and will not become it.
The other people cannot open the calendar, cannot see it and cannot correct their own dates, because the calendar lives on your phone. There is no health library, no symptom encyclopedia and no chat assistant. There is nothing about pregnancy or trying to conceive; Hers is only about periods. And because we run no server and cannot read your calendar, we also cannot restore it — if the phone and its iCloud backup are both gone, so is the record.
What it does do
Logging a period takes a couple of taps. It predicts the next one for everyone in the calendar, and reminds you before each PMS window and each period — theirs as well as yours — through notifications and home screen widgets, so you often know without opening the app. It syncs with Apple Health’s menstrual data so you never log the same day twice, and backs up through your own iCloud. There are no ads and no feed, paid or not.
Tracking one person is free. The second and third come with Hers Pro, which also brings the reminders, the widgets and the themes.
Questions
Is there a period tracker for multiple people?
Yes. Hers holds up to three cycles in a single calendar on one phone. Each person gets their own color and their own predictions, on the same month view. It is one app used by one person, not a shared account: there is no sign-up, no invitation and no pairing code, and nobody else has to install anything.
How many people can one calendar hold?
Three, including yourself. Tracking one person is free; the second and third come with Hers Pro. Three is a real limit, not a soft one — if you need to keep records for more people than that, Hers is not the right tool.
Does the other person need to install the app?
No. There is no account, no invitation and no pairing code. One person keeps the calendar and logs everyone’s days on their own phone. Nothing passes between devices because there is only one device.
Can I keep my own cycle and my daughter’s in the same calendar?
Yes, and a mother and daughter is one of the most common pairs. Everyone in the calendar is tracked and predicted the same way — there is no owner and no follower, just people with cycles. The same is true of two sisters, two friends, or you and your partner.
Is this for tracking someone without them knowing?
No, and please do not use it that way. Hers is built for people who keep each other’s dates on purpose — the friend who texts you the day before, the mother who remembers. A record kept about someone who has not agreed to it is a different thing entirely, and nothing in this app is designed to make that easier or to hide it.
What can Hers not do?
It is iPhone only, with no Android version planned. It holds three people and no more. The other people cannot open the calendar or edit their own days, because the calendar lives on one phone. There is no health library and nothing about pregnancy or trying to conceive. And because there is no server, if the phone and its iCloud backup are both gone, we cannot restore the calendar for you.
About this page
Everything here describes Hers as it shipped in September 2026. Apps change; if something on this page has gone out of date, tell us and we will fix it.
If you came here comparing Hers with one particular app, there is a longer and more specific write-up on the Flo alternative page, including the things Flo does better. More questions are answered on the FAQ.