Ebb
Free, open-source period tracker for Android · Public beta
Your cycle, on your phone. Nowhere else.
Ebb is a private period tracker that works entirely offline. It tracks your period, estimates when the next one is due — honestly, as a range, even when your cycles are irregular — and reminds you beforehand. There's no account and no server, and it doesn't even have permission to use the internet.
- Free, no ads
- Open source
- No account
- No internet permission
- Phones and tablets
Simple to use, honest about what it knows
One tap when your period starts, one when it ends. Everything else is there when you want it and out of the way when you don't.
An estimate you can trust
Ebb learns your rhythm from your own history and shows the next period as a range, with how sure it is. Irregular cycles get a wider window, not false confidence.
Forgiving when life happens
Forgot to log? Add it on an earlier day or fill in past periods. Illness or a medication change threw one cycle off? Mark it as not counted and it won't skew the estimate.
Reminders, without the cloud
A heads-up a few days before your period is expected, scheduled on the phone itself. They arrive with no signal and in airplane mode.
Backups and new phones
Save your history to a file wherever you choose, or move it to a new phone by scanning a few QR codes — one phone shows, the other looks.
More than one person
Helping a child who's just starting? Track them too, switch with a tap, and hand their history over to their own phone when the time comes.
Nothing to sell you
No ads, no premium tier, no upsell. Ebb does one thing, and it's free.
Your data stays on your phone
The question “what do they do with my data?” has a boring answer: nothing, because it never reaches us.
No internet permission
Ebb is built without permission to use the internet, so Android itself stops it from sending anything anywhere. You can check the app's permission list yourself.
No account, no server
Everything you log lives in a database on your phone. It only goes somewhere else if you move it yourself — a backup file, or another phone.
Nothing watching
No analytics, advertising or tracking in the app, and it's excluded from Android's cloud backup. Delete your data in Settings and it's gone.
Check our work
Ebb is open source under the GNU General Public License. Read exactly what it does on GitHub — the releases are built from that same code.
The only permissions Ebb asks for: notifications, for reminders; the camera, only while receiving history from another phone; and restarting reminders after your phone reboots.
Ebb 0.8.0 for Android
Released October 22, 2026 · Android 7.0 or newer
Download APK 70 MB- File
- ebb-0.8.0.apk
- SHA-256
7fb21c448e627234723c33e4260e2443e2bc8e2e9f50b5703b1d98368023e055- Signed by
- SuperDaveLab
- Source
- Built from tag v0.8.0
Testers wanted
Speak German, Spanish, French, Italian, Portuguese or Russian?
The next version of Ebb speaks all six, and each translation needs a native speaker to read it before it reaches everyone. Half an hour of your eyes makes sure Ebb sounds natural, plain and calm in your language, and never promises more than it knows.
Try the preview and help check itInstalling
- Tap Download APK on your phone. Chrome warns that the file might be harmful — it says that about every app from outside the Play Store. Tap Download anyway.
- Open the download. At Do you want to install this app?, tap Install. The first time, your phone may ask you to allow Chrome to install unknown apps before that.
- If you see App blocked to protect your device, tap More details, then Install anyway. That's Play Protect being cautious about an app it hasn't seen before; Ebb is new.
Updates install over the top and keep your history. Uninstalling erases it — use Back up to a file first if you want to keep it. Coming to F-Droid.
Found a problem? Mention the version shown at the bottom of Ebb's Settings when you report it.
Questions people ask
Plain answers, including the one trade-off that comes with keeping everything on your phone.
Is Ebb really free?
Yes. There are no ads, no subscription and nothing to unlock. Ebb is open source under the GNU GPL, and SuperDaveLab's paid desktop apps are what pay for it.
Does Ebb work offline?
It only works offline. Ebb has no permission to use the internet, so the estimates, reminders and backups all happen on your phone. Reminders arrive in airplane mode too.
Does it work with irregular periods?
Yes. Ebb shows the next period as a range with how sure it is, and irregular cycles get a wider range rather than a confident wrong date. With only a little history it leans on a typical 28-day cycle and says so. A cycle thrown off by illness or a medication change can be left out of the estimate.
Where is my data stored?
On your phone, and nowhere else. There's no account and no server, so it never reaches us, and Ebb is left out of Android's cloud backup, so it isn't copied anywhere either. You can delete everything in Settings whenever you like.
What if I lose my phone?
Then your history goes with it, because there's no cloud copy to restore from. That's the trade-off for keeping it on your phone. Use Back up to a file in Settings now and then, and keep the file somewhere other than your phone.
Can I move my history to a new phone?
Yes. Choose Send to another phone in Settings on the old phone and Receive from another phone on the new one, then point the camera at the QR codes. No internet needed. A backup file works too: Restore from a backup brings it back.
Can I track someone else's period too?
Yes — a child who's just starting, for example. Choose Track someone else too in Settings and switch between people from the home screen. When they get their own phone, send just their history over to it.
Does Ebb predict ovulation or fertile days?
It can show an estimated fertile window, but only if you turn it on in Settings. It's worked out from cycle timing alone, which isn't reliable enough to use as contraception.
How is Ebb different from other period tracker apps?
Many popular period trackers keep your history on their servers so it can sync between devices. Ebb has no server: your history lives on your phone and moves only when you move it. It's also free and open source. It can't import from other apps yet, but you can add past periods by hand.
Where can I download Ebb?
Right here: download the APK for Android 7.0 or newer, on phones and tablets. It's coming to F-Droid. Updates install over the top and keep your history.
Also from SuperDaveLab
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- Import statements and review every extracted row before export
- Export to CSV and Excel for bookkeeping and tax prep
- A desktop app for Windows, macOS and Linux
Tell us what you think
Something confusing, something missing, or something that went wrong? Tell us. Every message is read.
This form belongs to the website, not the app: only what you type here is sent, by email, to SuperDaveLab. Nothing from Ebb itself is included. Leave your email out if you don't need a reply.
Prefer email? feedback@superdavelab.com
Checking a translation? The preview page says what to look for, and has its own form.