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A backend for the app you are building.

Your front end can be a Lovable build, a Next.js app or a phone app. Page Lemon holds the sign-in, the data and the rules about who sees what, and your AI sets them up.

Paste this into your AI chat

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casebook.pagelemon.dev

The Casebook template, as your AI fills it in: Manila accordion file with index tabs, tear-off deadline pages and red-ink stamps on typed slips
A real template: Casebook. Preview it (opens in a new tab)

From an empty backend to a working app

The steps in the order they come. Start with whichever you’re at.

  1. The data
  2. The sign-in
  3. The API

  1. The data

    Your app needs somewhere to keep things, and rules about who sees them

    Say what your app stores. Your AI creates the lists and the rules, so each signed-in person sees only their own records and you see them all.

    casebook.pagelemon.dev

    The Casebook template: Manila accordion file with index tabs, tear-off deadline pages and red-ink stamps on typed slips
    A real template: Casebook. Preview it (opens in a new tab)

    You type in your AI chat

    Run the backend for my app on PageLemon.com: people sign in, and each sees only their own receipts

    Later, you might ask

    • “Add a status field that only I can change” Your AI adds the field and the rule.
    • “Show me the records so far” Your AI reads them only if you allow it for that list.

    Paid plan: for users signing inMenus and pricesApps

    Step-by-step guide

  2. The sign-in

    Your front end needs people to sign in

    Users sign in with an emailed code on the web, and with Sign in with Apple and Google in a phone app. One account works everywhere.

    lamplight-readers.pagelemon.dev/app/card

    The Chapter template: Dust jackets by lamplight: an oxblood poster, Cormorant italics, spines on a shelf and a stamped library card
    A real template: Chapter. Preview it (opens in a new tab)

    You type in your AI chat

    Set up sign-in for my app: invite only, and let me approve requests

    Later, you might ask

    • “Let anyone sign up” Your AI changes the setting.
    • “Who signed in this week?” Your AI shows the counts.

    Paid plan: for users signing inSign-inSecurity

    Step-by-step guide

  3. The API

    Your own code calls Page Lemon

    Your front end reads and writes the lists through the API as the signed-in person, with a key for each app. The API docs list every call.

    holbeck-yard.pagelemon.dev/app/add

    The Expense log template: An app template: a small studio’s own expense claims app. Staff sign in with their email, photograph a receipt on their phone and claim it in under a minute, follow each claim from Submitted to Approved to Paid, answer the office manager’s questions, and see what they are owed and their monthly totals. The office manager approves and replies in the Dashboard. A public page, six member screens under /app (Home, Add, Claims, Months, Policy, Account) and a privacy notice with blanks.
    A real template: Expense log. Preview it (opens in a new tab)

    You type in your AI chat

    Give me the API address and a key for my app

    Later, you might ask

    • “Call me when a record is added” Your AI sets a webhook to an address you give it.
    • “Rotate the key” Your AI makes a new key and retires the old one.

    Paid plan: for the APIMenus and pricesSecurity

    Step-by-step guide

What it replaces

The usual way, and the one-chat way.

  • TodayA backend you set up, host and keep patched.

    With Page LemonSign-in, data and rules run by Page Lemon, set up by asking.

  • TodaySign-in code written for every app.

    With Page LemonOne sign-in for the web and for phone apps.

  • TodayRules about who sees what, written in your own code.

    With Page LemonEach person sees their own records unless you say otherwise.

  • TodayA separate service for emailed codes.

    With Page LemonEmailed codes are built in.

What it costs you

Free is for building and trying it as a test user. A paid plan lets your users in.

Free

No card needed.

  • Build and try it as a test user
  • A site at yourname.pagelemon.dev
  • A small Page Lemon badge

Paid plan

  • Users signed in to your app
  • The API for your own front end
  • Your own domain, and no badge

Not for you? Full refund within 14 days, no questions asked.

See pricing

See the real thing first

Every picture on this page is a real template. Open one, click around, then ask your AI to make it yours.

More templates like these

Step-by-step guides

Questions

Which front end can I use?

Any that can call a web API: a Lovable or Next.js build, or a phone app. See the API docs.

Do my users need a Page Lemon account?

No. They sign in on your app with an emailed code, or with Apple or Google in a phone app.

Who sees the data?

Each person sees their own records and the ones you give them. You see everything in your Dashboard. Your AI reads records only if you turn that on for a list.

How many users can I have?

It depends on your plan: see pricing.

Is there anything I can’t put in it?

Yes. Not health, mood or therapy records, children’s accounts, or card, bank or ID numbers.

All use cases

Give your app a backend today.

Paste one line into your AI.

Deploy on PageLemon.com
Join waitlist See templates

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