Support

Yes. Every feature is free, including Ask Lumi and Insights. There are no ads, purchases or subscriptions.

Only on your iPhone. Lumi has no account and no cloud. Your logs are included in your normal iPhone backup (iCloud or computer), like other app data.

Restoring your new iPhone from a backup brings Lumi’s data with it. You can also open Settings → Your data → Export JSON on the old phone, send the file to yourself, and use Import JSON on the new one. Importing replaces what’s on the new phone.

Open Settings → Your data. Use Export JSON or Export CSV to save a copy, or Delete all data to erase everything on this iPhone. Deleting can’t be undone, so export first if you want to keep a copy.

Open the Ask tab and tap Download. Lumi downloads Google’s Gemma model (about 2.6 GB, Wi-Fi recommended) directly from Hugging Face, once. After that, every answer is generated on your iPhone, even offline. Nothing you ask is sent anywhere. You can remove the model in Settings → AI without losing your cycle data.

Make sure you’re on Wi-Fi and have about 3 GB of free space. If Hugging Face asks you to accept the Gemma license, open the model page in Safari, accept it, and try again. The download keeps going in the background, so you can leave the app while it runs.

Predictions start from the cycle length you enter and get better as you log more periods. They’re estimates, not guarantees. Ovulation estimates are not a form of birth control.

Check that reminders are on in Settings → Communication, and that notifications for Lumi are allowed in the iPhone Settings → Notifications → Lumi. Focus modes can also hide them.

Turn it on in Settings → Privacy. It uses Apple’s Face ID or Touch ID on your device; Lumi never sees or stores your biometrics. If Face ID fails, you can use your iPhone passcode.

No. Lumi helps you notice patterns in your own cycle. It isn’t a medical device and doesn’t diagnose, treat or prevent any condition. Talk to a clinician for medical decisions.