Privacy

Plain language, no fine print. Open Book is built local-first: the sensitive detail never leaves your phone.

What stays on your device

The specific sites, apps, and content you browse or block are processed on your device by Apple's built-in Screen Time controls. That detail is never sent to our servers and never shared with your accountability partner.

What our server stores

To connect you with your partner and detect tampering, the server keeps only:

• Event types + timestamps — e.g. "blocking started", "a pause was requested". Never what was visited.
• Check-in status — whether your device is reporting in on schedule.
• Your partner's account — the email and password they choose when they accept your invite, and their mobile number (encrypted at rest), used only to text alerts.
• An anonymous device ID for your phone — no email or password is required from you to use blocking.
• Your subscription status, if you go Premium.

Event records are retained no longer than 90 days, then automatically deleted.

What your partner sees

Your partner sees event types and your check-in status — nothing about the sites or apps you use. Alert texts are status-free: they say something needs a look, never what happened.

Who we share with

Two service providers, each for one job:

• Twilio — delivers the SMS alerts to your partner's number.
• RevenueCat — manages your subscription.
• Email provider — if a partner requests a password reset, delivers the reset-link email to them. It contains only the link — never any of the accountable person's activity.

No advertising, no tracking, no analytics or data-broker SDKs. Open Book does not track you across apps or websites.

You're in control

Screen Time access can be turned off in your iPhone Settings at any time — you're never locked out of your own device. Turning it off simply lets your partner know.

Questions? Reach us at the address in the App Store listing.