Privacy policy
Last updated 2 September 2026. Operator: Semantig Tech Pte. Ltd., reachable at derek@semantig.ai.
The short version
Knowingo keeps the things it needs to give you back the book you were reading: where you stopped, what you highlighted, how much XP you have, which two languages you chose, and whether your subscription is active. It has no advertising, no advertising identifier, and no third party analytics or advertising software inside the app.
What we collect
From Sign in with Apple
Apple gives us an account identifier so we can recognise you on your next visit. Apple may also pass your name and an email address, and only the first time you authorise the app. If you use Apple's private relay address, that relay address is all we ever see. We never receive your Apple password.
What you create by reading
- Your position in a book, and which parts you have completed.
- The blocks you highlighted.
- Your XP total.
- Your interface language and your preferred book language, which are two separate settings.
- The length and language level you last chose for each book.
About your subscription
When you buy Premium, Apple performs the transaction. We receive a transaction identifier and the result of verifying it with Apple, so that the app can open the content you paid for. We never see your card, your billing address or your Apple account balance.
What we do not collect
- No advertising identifier, and no advertising network.
- No third party analytics software inside the app.
- No contacts, no photo library, no location, no microphone.
- No tracking of you across other companies' apps or websites.
Why we keep each thing
Every item above exists to deliver the service you asked for. Reading position and highlights are the product. Language preferences decide what the library can show you. Subscription status decides what the app may open. We do not keep a category of data because it might be interesting later.
Who else handles it
- Apple. Sign in, payment, subscription state and refund notifications.
- Supabase. Our hosting provider, which stores the account record and reading data on our behalf under contract.
- Nobody else. Your data is not sold, not rented, and not shared for advertising. If a law or a valid legal order ever compels disclosure, we comply with the order and no more.
Images and offline copies
Pictures inside a protected book are held only in memory while you read. They are cleared when you sign out, when a subscription lapses, or when access is withdrawn. The first version keeps no long term offline copy of protected content on your device.
How long we keep it
Your reading data stays while your account exists, because that is what makes the app usable when you come back. Ask us to delete the account and we remove the account record and the reading data attached to it.
Deleting your account
Write to derek@semantig.ai from the address on the account, or from the app, and ask for deletion. One thing to know first: deleting the account does not cancel an Apple subscription. Apple owns that billing relationship, so cancel the subscription in your Apple account settings first, then ask us to delete.
Children
Knowingo is not directed at children under 13 and we do not knowingly keep data about them. If you believe a child has created an account, write to us and we will remove it.
Your rights
You may ask for a copy of what we hold, ask us to correct it, or ask us to delete it. Write to derek@semantig.ai and we answer within 30 days.
Changes
If this policy changes in a way that affects what we collect or who touches it, we update the date at the top of this page and describe the change here rather than replacing the text silently.