Today
Your cycle day, and roughly when your next period’s due.
Period tracking that respects you.
See your cycle day and when your next period’s due, at a glance. Everything stays on your phone.
- Free
- No account
- Works offline
Simple on purpose
Three screens. That’s the whole app.
No feeds, no streaks, no lessons. Open it, see where you are, log in a couple of taps, close it.
Calendar
Period days filled in, darker on heavier days.
Log
Period started? Tap it, check the flow, save.
Private by design
Your cycle is nobody else’s business.
CycleSync has no accounts, no sync and no servers holding your data. It couldn’t share your history if anyone asked, because it never has it.
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Stays on this device
Your periods, symptoms, notes and settings are stored in this browser, on this device. Nothing leaves it.
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Sent to us: nothing
No analytics, no ads, no trackers.
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Yours to keep
Save a backup file whenever you like. The file is your own copy, and it isn’t encrypted, so keep it somewhere safe.
Straight from your browser
On your home screen in a minute.
Open cyclesync.net
In Safari on iPhone, or Chrome on Android.
Add to Home Screen
iPhone: tap Share. Android: open the menu.
Tap to open
It opens like any other app, and works offline once it has loaded.
Good questions
Is it really free?
Yes. There’s nothing to buy and no account to make. It’s a small app made by one person, for real use.
How does it know when my period’s due?
It looks at the length of your own past cycles. Bodies vary, so it gives a range and treats it as a guess. CycleSync isn’t a medical device, it doesn’t diagnose anything, and it shouldn’t be used for contraception.
Where is my information kept?
Only in this browser, on this device. There’s no account and no sync, so a phone or computer you haven’t used it on won’t have your history.
What if I get a new phone?
Save a backup file in Settings, then open it in CycleSync on your new phone. The file is your copy, so your history comes with you. Keep it somewhere safe, because it isn’t encrypted.
Does it work without internet?
Yes, once it has loaded the first time. After that it opens offline, like any installed app.
Ready when you are.
Tell it when your last period started. CycleSync takes it from there.
Start tracking