Why does a book tracker need my email address?

Open any app store category for trackers — films, books, games, running, travel — and count how many let you write down a single thing before asking who you are. It is a short list.

This is worth being annoyed about, briefly, and then being practical about.

Why the login is there

Rarely malice. Mostly architecture and incentives, in that order.

Most trackers are services, not apps. The thing you installed is a client; the actual product is a database on a server. Reviews other people can read, followers, cross-device sync, a public profile — none of that works without a user record. If those features are why you are there, the account is not overhead, it is the product.

An account also makes a business possible. A user record supports recommendations, engagement metrics, email, and in some cases advertising. Goodreads shows ads to everyone and has no ad-free tier. That is not a conspiracy, it is just what the shape of the company implies.

And it is the path of least resistance. Auth is a solved problem now. Building local-first — schema migrations on-device, export and restore that actually works, no server to fix your mistakes — is harder than adding a login screen.

What the account actually costs you

Three things, in rising order of how much you will care.

Your data has a landlord. Free tiers change. Trakt tightened its free-tier limits and roughly doubled VIP pricing in 2025; people who had spent years building a watch history found the boundaries had moved. That is a normal business decision and it is also the risk you accept by storing years of your own record on someone else’s terms.

Offline stops working. Most tracker services are useless on a plane, which is precisely where you finish books.

Export is an afterthought. Almost every service has an export button and almost nobody tests it. Goodreads’ CSV export has had reports for years of coming back without the “date read” column — the single field that makes a reading history worth having. Check yours before you need it.

What no-account apps give up

A fair page has to say this part too.

No sync. One device, unless you move a backup file yourself. If you log on a phone and a tablet, local-first is genuinely worse for you.

No social layer. No reviews from strangers, no followers, no lists to browse. For a lot of people that is the entire appeal of Letterboxd or Backloggd, and an offline tracker does not replace it.

Backups are your job. No server means no safety net. If you drop the phone in a canal and never exported, the data is gone. Any local-first app worth using makes exporting easy; you still have to actually do it.

What to look for

If you have decided the trade is worth it, four things separate a real local-first app from one that just delays the signup screen:

1. No account, not “optional account”. If there is a sync feature, there is a server, and your data is probably on it.
2. A real export. One file, everything in it, no paid tier gating it. Test it on day one.
3. Offline by default. Not “offline mode” — the normal state.
4. A named third-party list. Even a local-first app calls out to metadata providers when you search. It should say which.

Where this leaves you

Match the tool to the reason you are logging.

If you log to participate — to read reviews, to see what your friends are on, to have a profile — you want a service, and the account is the price of the thing you came for.

If you log to remember, an account buys you very little and costs you the three things above. That is the case Stadu is built for: films, TV, books, games, concerts, places and trips, all on one timeline, on your phone, with no sign-up and a one-file export. It has no social features whatsoever, which is the trade stated plainly.

Either answer is defensible. The mistake is ending up with an account you did not want because nobody offered the other option.