This is the whole policy, and it is short because the app is built so that there is very little to say.
Keep Up has no account, no sign-in and no server. I do not receive your data, because there is no mechanism by which I could: the app does not request Android's internet permission, so it cannot make a network connection even if it were asked to.
There is no analytics, no crash reporting, no advertising and no tracking of any kind.
Everything you put into Keep Up is stored only in the app's own private storage on your device:
Uninstalling Keep Up deletes all of it. Deleting a person in the app deletes theirs.
Keep Up asks permission to read your contacts in one situation only: when you tap Browse WhatsApp contacts or Browse Signal contacts. Those apps have no picker of their own — they sync into your address book under their own account type, and listing them means reading the address book.
Adding someone through the ordinary contact picker doesn't need the permission and doesn't use it. If you decline, everything else in the app still works.
What is read is copied into Keep Up's own storage on your phone. It is not uploaded, and I never see it.
When you tap Text, Call, Email, WhatsApp, Signal, Instagram or Messenger, Keep Up hands the person's number or handle to that app on your phone and steps out of the way. It does not send the message itself and does not see what you write.
Once you are in one of those apps, that app's own privacy policy applies to whatever happens next. Keep Up has no part in it.
Keep Up can write your data to a single file so you can move it to a new phone. That file is created only when you ask for one, and it goes wherever you send it — your email, your drive, a cable. It contains your Keep Up data in readable form, so treat it the way you would treat any file with your address book in it.
Separately, Android's own backup service may copy the app's data to your Google account, because Keep Up allows it the way most apps do. That is Android backing your phone up to your own account, not Keep Up sending anything to me. You can turn it off in Android's system settings, under Backup.
Keep Up is not directed at children, and does not knowingly collect anything from anyone, of any age.
If this policy changes, the new version will be published at this address with a new date at the top. Since the app collects nothing, any change is likely to be a correction rather than a new use of your data.