Privacy Policy
Lens teaches how AI works through short lessons on your iPhone. You sign in with Apple or Google to use it, and that account is the only information about you that leaves your device.
Last updated 1 October 2026
In short
- You sign in with Apple or Google. Lens keeps only what it needs to sign you in: your name, email address and an account ID.
- Your progress is saved only on your iPhone. Your account doesn’t hold it.
- Nothing you type in a lesson leaves your iPhone.
- There are no ads and no tracking, and Lens has no analytics of its own. Google’s sign-in software and Firebase report some technical details to Google, as this policy describes.
- You can delete your account in the app at any time.
Your account
Lens asks you to sign in with Apple or Google before your first lesson. When you do, we keep:
- your name, as Apple or Google gives it to us
- your email address. With Apple you can choose to hide it, and we then receive a private relay address that forwards to you
- an account ID that identifies you to Lens
- whether you used Apple or Google, and when you created the account and last signed in
These are stored in Firebase Authentication, a Google service that runs Lens’s sign-in on our behalf. Firebase also receives your device’s IP address and basic details of the app and iOS version with each sign-in, which it uses to operate and secure the service. We use your account only to sign you in. We don’t use it to contact you, we don’t sell it, and we don’t share it with anyone else.
We keep your account until you delete it. Deleting it in the app removes it from Firebase Authentication straight away (see Deleting your data).
What Lens saves on your iPhone
To remember your progress between sessions, Lens keeps a small record in its own storage on your device:
- the lessons you’ve completed
- your XP total and day streak
- the days you completed a lesson or finished a game, for the calendar on the Profile tab
- your best score in each Practice game
- whether you’ve been past the welcome screen
This record contains no name, contact details, location or anything else that identifies you, and Lens never sends it anywhere. It isn’t linked to your account, so signing in on another iPhone doesn’t bring it with you.
To keep you signed in, Firebase and Google Sign-In also store your sign-in session in your iPhone’s keychain.
What you type in lessons
Two lessons have a text box: Tokens, where you type text to see how a model splits it, and Prompt practice, where you draft a prompt. What you type stays on screen while the lesson is open and is discarded when you close it. It isn’t saved, and it isn’t sent to an AI or any other service.
Every reply you see in a lesson is written in advance and built into the app.
What Lens doesn’t do
- Connect to the internet for anything other than signing you in
- Send your progress, or anything you type, to us or to anyone else
- Show ads or use advertising identifiers
- Include analytics or crash reporting of its own
- Track you across other apps or websites
- Sell or share your data
What Apple and Google handle
Your App Store account and downloads are handled by Apple under Apple’s own privacy policy.
When you sign in, Apple or Google checks who you are on its own sign-in screen, under its own privacy policy: Apple’s for Sign in with Apple, Google’s for Google. For example, Google may ask for a phone number for two-step verification, or check where a sign-in comes from to spot suspicious activity. Google’s sign-in software inside Lens reports that kind of information to Google, not to us, and Lens’s entry on the App Store lists it for that reason.
If you’ve turned on Share With App Developers in your iPhone’s settings (under Privacy & Security, then Analytics & Improvements), Apple may give us crash reports and statistics about how Lens is used. Apple collects these, not Lens, and we use them only to find and fix problems. You can turn the setting off at any time.
If you back up your iPhone to iCloud or a computer, iOS includes Lens’s saved progress in the backup, as it does for most apps. Your backup settings control this.
Deleting your data
Delete account on the Profile tab deletes your account from Firebase Authentication straight away and clears your progress on the iPhone. It asks you to sign in with Apple or Google once more to confirm. For Sign in with Apple, it also withdraws Lens’s access to your Apple Account; for Google, it removes Lens from your Google Account’s connected apps.
Reset progress on the Profile tab clears your completed lessons, XP, streak, calendar and best game scores, and keeps your account. Sign out keeps both. Deleting Lens from your iPhone removes the progress it saved there, but not your account: delete that in the app first, or email us and we’ll delete it for you.
Children
Lens’s lessons are suitable for all ages. Signing in needs an Apple or Google account, and those companies set their own rules for children’s accounts. For a child under 13 that means an account a parent created and manages. Lens keeps the same account details for everyone, and nothing more.
Changes to this policy
If Lens changes in a way that affects your privacy, for example saving your progress to your account, we’ll update this policy and the date at the top before that version is released.
Contact
For questions about this policy or your privacy, email: