Free cycle tracker
Sync Tracker
Log your cycle in a few taps, see what your hormones are doing on any day, and watch your patterns change over the months. Works on your phone and your computer.
You're inside Instagram, TikTok or another app. Your entries won't be saved here and you can't add the tracker to your home screen. Copy the link and open it in Safari or Chrome.
Get your tracker
Where should I send it?
Pop your name and email in. The tracker opens on the next screen, and I'll email you the link so you always have it.
You're in
Your Sync Tracker is ready
Install it once, and it opens like an app from then on. Pick your device:
- Open this page in Safari.If you came from Instagram or your email app, tap ••• or the compass icon and choose Open in Safari (or Open in browser).
- Tap Open the tracker below.
- Tap the Share button at the bottom of the screen.On some iPhones it's inside the ••• menu at the bottom right.
- Scroll down and tap Add to Home Screen, then Add.
Don't see "Add to Home Screen"? Scroll to the very bottom of the Share menu, tap Edit Actions…, tap the green + next to Add to Home Screen, then tap Done.
- Open this page in Chrome.If you came from Instagram or your email app, tap ⋮ and choose Open in Chrome (or Open in browser).
- Tap Open the tracker below.
- Tap the ⋮ menu at the top right.
- Tap Add to Home screen or Install app, then Install.
Using Samsung Internet? Tap the ☰ menu, then Add page to and Home screen.
Nothing gets downloaded. Installing gives the tracker its own window and an icon in your Dock, like any other app.
In Chrome
- Click Open the tracker below. It opens in a new tab.
- Click the ⋮ menu at the top right of Chrome.
- Choose Cast, save, and share, then Install page as app…In some versions it says Install Sync Tracker… right in the menu.
- Click Install. The tracker opens in its own window.
- To keep it handy: right-click its icon in the Dock, choose Options, then Keep in Dock.
In Safari
- Click Open the tracker below.
- In the menu bar at the very top of your screen, click File, then Add to Dock…
- Click Add. The icon appears in your Dock.
No "Add to Dock" in Safari? Your Mac needs macOS Sonoma or newer. Use Chrome instead.
Nothing gets downloaded. Installing gives the tracker its own window and an icon on your taskbar, like any other app.
In Chrome
- Click Open the tracker below. It opens in a new tab.
- Click the ⋮ menu at the top right of Chrome.
- Choose Cast, save, and share, then Install page as app…In some versions it says Install Sync Tracker… right in the menu.
- Click Install. The tracker opens in its own window.
- To keep it handy: right-click its icon on the taskbar and choose Pin to taskbar.
In Edge
- Click Open the tracker below.
- Click the ⋯ menu at the top right of Edge.
- Choose Apps, then Install this site as an app.
- Click Install. Tick Pin to taskbar if Edge offers it.
Log in the installed app, not in a browser tab. Your entries stay in the place you log them. Using Firefox? It can't install apps, so bookmark the tracker or use Chrome.
Good to know
Where is my data saved?
Only on your own device, inside the browser you use. Nothing is uploaded and I can't see it. Always open the tracker the same way (the home screen icon), because a different browser or phone starts empty.
Can I move it to a new phone?
Yes. In the tracker, go to My cycles, then "Back up or move to a new phone". Save a backup there every few weeks, and restore it on your new phone.
Will I lose my entries if I clear my browser?
Clearing only your history is fine. Clearing cookies or website data deletes your entries, and on a Mac, Safari's "Clear History" does that too. Save a backup first: in the tracker, go to My cycles, then "Back up or move to a new phone". The tracker also reminds you once a month.
On iPhone, add it to your Home Screen. If you only use it in a Safari tab, Safari can delete its data after about a week without a visit.
Does it tell me when I ovulate?
Unless you measure your BBT and log your cervical fluid, the tracker can only predict your ovulation. It uses the data you give it to estimate when you might be ovulating, and you might not be ovulating at all.
Does it cost anything?
No. The Sync Tracker is free.
Is this medical advice?
No. It's an educational tool, not medical advice, and the estimates are not a method of contraception.