My AI-built app needs sign-in and saving. Do I need a backend?

The short answer

Not on Tiniest Cloud. Sign-in, saving, live updates, file uploads and an AI helper are already inside every app, with nothing to set up. Your agent builds the part people see; Tiniest Cloud brings everything behind it.

The cloud hugging a barrel. It says: It remembers everything

Where apps usually get stuck

The first version of an app is quick: a screen, a list, a button. Then someone asks “can my sister use it too?” and everything changes. Now it needs to know who is who, keep each person’s things apart, and remember all of it after the tab closes. That is the “backend”, and it is where most AI-built apps quietly stop.

What is already there

  • Sign-in. Email link, Google, or a fingerprint. No accounts to make, no passwords anywhere.
  • Saving. Whatever people add is kept. Private to each person, shared with everyone, or worked on as a team; one switch.
  • Live updates. A change on one phone shows on the others in under a second.
  • Photos. People can add pictures, and the AI helper can read them.
  • An AI helper. Your app can ask AI to summarise, suggest, sort or write, with no keys and no separate bill.
  • Nudges and chores. It can send a notification to someone’s phone, and do things on a schedule while you sleep.

How your agent uses it

When your agent is connected to Tiniest Cloud, it knows all of this is there and builds with it, the same way it would build with anything else. You do not have to ask for it by name. Say what the app should do (“a list we both keep, and it tells me when she adds something”) and the sign-in, saving and nudges come with it.

Already built it the old way?

One sentence: “make this app fit Tiniest Cloud.” Your agent rewrites the saving and the sign-in to use what is already there, and the old version stays in case you want it back.

Plain answers

People also ask.

Do I need a database?

No. Saving is built into every app. Your agent stores and reads things without you setting anything up, and each person’s things are kept apart unless you choose to share them.

Do I need an API key for the AI?

No. The AI helper runs on your plan, with no keys in your app and no separate account. The people who use your app never pay for it.

What can the app not do?

It cannot run its own server code, take payments, or send email from inside the app. It is for the small, real apps a few people share, and for those it has everything.

Your tool

Put it online from wherever you built it.

The cloud pointing at you. It says: share the link

Go make it real.

Build it with your agent, say “put it online”, send the link.

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