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Just open Ember and tap "Log Today" on the dashboard. Select your flow level (spotting, light, medium, or heavy) and you're done. You can also tap any past date on the calendar to retroactively log period days.
For the most accurate predictions, log at least 2-3 complete cycles. The more data Ember has, the better it can predict your next period.
No. Ember has no account system at all. There's nothing to sign up for, no email to enter, and no password to remember. Just download and start using it immediately. Your data is stored only on your device.
Ember requires iOS 17 or later. It works on iPhone and Apple Watch. To check your iOS version, go to Settings > General > About on your iPhone.
We're actively working on data import support. In the meantime, you can manually log past period dates on the calendar view to help Ember build an accurate prediction model. Tap any date and log it as a period day.
All your data is stored locally on your device in encrypted storage. We do not operate any servers that store user data. If you enable iCloud sync (Premium), your data is also stored in your personal iCloud account, which is encrypted end-to-end by Apple. We never have access to it.
Deleting the app removes all locally stored data from your device. If you had iCloud sync enabled, your data remains in your iCloud account and will restore when you reinstall the app.
We strongly recommend enabling iCloud sync or exporting your data (PDF/CSV) before deleting the app if you want to preserve your history.
Your data is protected by your device's security (passcode, Face ID, or Touch ID). Since we don't store your data on any server, there is nothing for us, hackers, law enforcement, or anyone else to access remotely. The only way someone could see your data is by having physical access to your unlocked device.
For extra protection, you can enable the in-app passcode/biometric lock in Ember's settings.
With Premium, go to Settings > Export Data. You can choose:
Both formats include your cycle history, symptom patterns, and any other tracked data. The export is generated on your device -- you choose where to share it via the iOS share sheet.
Go to Settings > Privacy > Delete All Data in the app. This permanently removes all your cycle data from your device. This action cannot be undone. If you have iCloud sync enabled, data will also be removed from iCloud.
Premium includes everything in the free version, plus:
Premium is available in three options:
Prices may vary by region. All purchases are processed through the App Store.
To cancel your Ember Premium subscription:
You'll keep Premium access until the end of your current billing period. All your logged data remains on your device regardless of subscription status.
Since subscriptions are handled by Apple, refund requests go through Apple as well. Visit reportaproblem.apple.com, sign in with your Apple ID, find the Ember purchase, and follow the steps to request a refund.
Yes. Open Ember on your new device, go to Settings > Premium, and tap "Restore Purchases." As long as you're signed in with the same Apple ID, your subscription or lifetime purchase will be restored automatically. If you had iCloud sync enabled, your data will also sync to the new device.
Ember uses an on-device algorithm that analyzes your logged period data to predict future cycles. It considers your average cycle length, variations in cycle length, and period duration. After 2-3 cycles, predictions become quite accurate for most users. The algorithm runs entirely on your device -- no data is sent anywhere.
Important: Predictions are estimates and should not be used as a sole method of contraception.
To add an Ember widget to your home screen:
Widgets update throughout the day to show your current cycle day, phase, and upcoming predictions.
The Ember Apple Watch app installs automatically when you have Ember on your iPhone and an Apple Watch paired. It lets you:
Data syncs between your iPhone and Apple Watch automatically.
Ember is available in seven languages: English, German (Deutsch), Spanish (Espanol), French (Francais), Japanese, Korean, and Portuguese (Brasileiro). The app automatically uses your device's language setting. We're working on adding more languages.
Ember is currently iOS only. We're focused on making the best possible iOS experience before considering other platforms. This lets us take full advantage of iOS-specific technologies like SwiftData for encrypted local storage, WidgetKit for home screen widgets, and WatchKit for the Apple Watch companion app.
Quick solutions for the most common problems.
Ember needs at least 2-3 logged cycles for accurate predictions. Make sure you're logging the start and end of each period. If your cycle is irregular, predictions will naturally have a wider range.