Last updated 17 September 2026. Nerdi is in closed beta.
Your library, your reading positions and your interests stay on your device. Nothing about them is sent to a server. The only thing that leaves your phone is usage data, described below, and you can turn that off.
Signing in is optional. If you do, these are stored so they follow you between devices: which papers you saved, your reading position in each, which papers you asked not to see again, your selected interests, and whether you finished onboarding. They are tied to the account identifier Apple gives us. If you chose to hide your email address, we only ever see Apple's private relay address.
When the app crashes or hits an unexpected error, a report goes to Sentry: the error, where in the code it happened, your device model and iOS version. Reports are filtered before they are sent to remove anything shaped like an email address or a login token. They never contain your searches or the contents of anything you read.
If usage sharing is on — it is on by default and there is a switch in Settings — the app records six things: opening a paper, a PDF loading, a PDF failing to load, saving a paper, tapping one of the day's picks, and returning to something you were reading. Each record holds the event name, the identifier of the paper it refers to, the time, and a random identifier for your installation of the app. If you are signed in, it also holds your account identifier.
It does not hold your search terms, the contents of any paper, or anything you typed. The database column that would be needed to store them does not exist.
Turning the switch off stops collection immediately and discards anything not yet sent. It does not delete records already sent.
Saved data and usage data are stored on Supabase, hosted in the European Union (Frankfurt). Crash reports are stored by Sentry. Sign-in is handled by Apple. When you open a paper's PDF or source page, it is fetched from the publisher or from OpenAlex, and their own privacy policies apply to that visit.
Nothing is sold, and there is no advertising or cross-app tracking in Nerdi.
Settings has a Delete account button. It removes your account and everything stored against it, including saved papers, dismissals, interests and usage records tied to that account. This cannot be undone. Full instructions.
Usage records created while you were signed out carry no account identifier, so there is nothing linking them to you and no way to single them out for deletion. They are tied only to a random per-installation identifier, which is erased when you delete the app.
Questions about any of this: korayozcan33@gmail.com.