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An app where your users can ask the AI about their own things.

A summary of the month, a chat about their entries, or each new entry sorted for them. Your AI builds the app and the button; the answers come from your own AI key, and each user’s AI can read only what that user can already see.

Paste this into your AI chat

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holbeck-yard.pagelemon.dev

The Expense log template, as your AI fills it in: 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)

From a first AI button to an app people rely on

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

  1. The idea
  2. Try it first
  3. Your own key
  4. Sorting
  5. Keeping it fair
  6. Telling people

  1. The idea

    Your users keep entries, and they keep asking “what did I spend this month?”

    Start with an app where people add their own entries. Then ask for a button that gives each user an AI summary of their month. It reads only what that user can already see, and the answer is marked “AI answer, may be wrong”.

    holbeck-yard.pagelemon.dev/app/months

    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

    Build with PageLemon.com: an app where my team adds expenses with a photo of the receipt, with a button for an AI summary of their month

    Later, you might ask

    • “Show me the app as a user sees it” Your AI gives you a sign-in link for a test user, who never counts towards your users.
    • “What can the summary read?” Only that user’s own entries, and lists you’ve made public. Never other users’ entries, emails, files or your private notes.

    Free: build it and try the AI freeAppsAI in your app

    Step-by-step guide

  2. Try it first

    You want to see it work before you set anything up

    Try AI in your app free for 3 days or 10 requests, whichever comes first, on Page Lemon’s key. The trial runs on your pagelemon.dev address, and only you and your test users can use it. Your Dashboard shows how many requests are left.

    holbeck-yard.pagelemon.dev/app/claims

    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

    Add an AI chat to my app where users can ask about their own entries

    Later, you might ask

    • “Stop an answer halfway” Users can stop an answer, copy it or try again.
    • “How many free requests have I left?” Your Dashboard shows it under Pages, then AI.

    Free: the trial is free on every planAI in your appApps

    Step-by-step guide

  3. Your own key

    You’re ready to open it to your users

    Add a key from OpenRouter, OpenAI, Anthropic, Google Gemini, Meta, xAI, Mistral, DeepSeek or Groq in your Dashboard, after confirming it’s you with a code we email you. You pay your provider directly and set a spending limit there. Page Lemon sells no AI credits.

    holbeck-yard.pagelemon.dev/app/policy

    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

    I’d like to use my own AI key so my users can use the summary

    Later, you might ask

    • “My provider account ran out of credit” AI answers pause and we tell you once. Top up, and AI comes back on by itself within about 10 minutes.
    • “Which provider should I use?” Use the one you already have an account with. OpenRouter can set a spending limit on the key itself.

    Paid plan: your own AI key, on a bigger paid planAI in your appSecurity

  4. Sorting

    Nobody wants to pick a category for every entry

    Have the AI sort each new entry into a category when a user adds it, so lists stay tidy without a dropdown. The same key and the same limits apply.

    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

    Have the AI sort each new expense into a category

    Later, you might ask

    • “Add a category for travel” The AI uses it from the next entry.
    • “Show me the totals by category” Each user’s page shows their own totals by category, and you see everything in your Dashboard.

    Paid plan: your own AI key, on a bigger paid planAI in your appMenus and prices

    Step-by-step guide

  5. Keeping it fair

    You want to know what it costs, and stop one person using it all

    Each user can ask 10 times an hour and 20 times a day, and your site 500 times a day. You can lower these, add a monthly number per user and give users on a paid plan of your app more. Your Dashboard shows requests, tokens, errors and timings by day, prompt, model, plan or user, and downloads them as a CSV file.

    tollgate-harriers.pagelemon.dev/app/subs

    The Stride template: Club vest: racing green and amber stripes like a club vest, white race numbers, a running-track lane motif, bold condensed headings, dark scheme
    A real template: Stride. Preview it (opens in a new tab)

    You type in your AI chat

    Give paying users more AI requests than free users

    Later, you might ask

    • “Send a record of each request to Langfuse” Page Lemon sends the time, model, tokens and outcome, with a code for the user. Never the question or the answer.
    • “Show me AI usage by model for last week” Your Dashboard shows it, and you can download it as a CSV file.

    Paid plan: paid plans for your usersAI in your appPayments

    Step-by-step guide

  6. Telling people

    Your users should know an AI is involved

    Your app’s privacy page has blanks for who sees the entries and how long you keep them. Add that you use an AI assistant, and your AI can write the wording. Questions and answers are never stored by Page Lemon.

    holbeck-yard.pagelemon.dev/privacy

    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

    Update my privacy page to say my app uses an AI assistant

    Later, you might ask

    • “Who can see what the AI says?” Only the user who asked. Nothing is stored.
    • “Who can read my users’ entries besides me?” Only you in your Dashboard. Your own AI reads entries only if you allow it for a list.

    Free: every app has a privacy pageSecurityAI in your app

What it replaces

The usual way, and the one-chat way.

  • TodayA server of your own to call an AI provider, with your key hidden in it.

    With Page LemonYour key saved in your Dashboard, and each question sent straight to your provider.

  • TodayCode to decide what the AI may read.

    With Page LemonThe AI reads only what the signed-in user can already see.

  • TodayA bill you find out about at the end of the month.

    With Page LemonPer-user and per-site limits, and a usage report by day, model and user.

  • TodayA spreadsheet export to find out which prompts people use.

    With Page LemonRequests, tokens and timings by day, prompt, model, plan or user, as a CSV file.

  • TodaySign-in, records and billing built before the AI part even starts.

    With Page LemonThe app, its sign-in and its plans come with the AI, set up by asking.

What it costs you

Free is for building and trying your app, including the AI trial. A paid plan lets your users in and lets you add your own AI key.

Free

No card needed.

  • Build your app and try it as a test user
  • Try AI in your app free for 3 days or 10 requests
  • A site at yourname.pagelemon.dev
  • A small Page Lemon badge

Paid plan

  • Users signed in to your app
  • Your own AI key, so your users can use it
  • Limits and a usage report for the AI
  • 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

Who pays for the AI?

You do, through your own AI key from OpenRouter, OpenAI, Anthropic or another listed provider. Page Lemon sells no AI credits. Try it first on ours, free for 3 days or 10 requests, whichever comes first. Your own key needs a paid plan. See AI in your app.

What can the AI read?

Only what the person using it could already read: a user’s own entries, their group’s where you share entries in groups, and lists you’ve made public. Never other users’ entries, emails, files or your private notes.

Are questions and answers stored?

No. Answers are plain text marked “AI answer, may be wrong”, and nothing is stored. A chat stays in the user’s browser tab and clears itself when what they’re allowed to see changes.

Can I stop one person running up the bill?

Yes. Each user can ask 10 times an hour and 20 times a day, and your site 500 times a day. You can lower these and add a monthly number per user. Your spending limit at your provider is the last guard.

Which AI providers can I use?

OpenRouter, OpenAI, Anthropic, Google Gemini, Meta, xAI, Mistral, DeepSeek and Groq. Page Lemon sends each question straight to your provider with its own code, with no other service in between.

Can I see what it costs and how it is used?

Your Dashboard shows requests, tokens, errors and timings by day, prompt, model, plan or user, and downloads them as a CSV file. Your provider’s own dashboard shows what you’re charged.

Do my users need to know it’s an AI?

Yes, tell them in your privacy notice that you use an AI assistant. Your AI can give you the wording, and the answers are marked as AI answers anyway.

What happens if my provider account runs out of credit?

AI answers pause and we tell you once. Top up at your provider and AI comes back on by itself; we try again every 10 minutes.

Is there anything I can’t put in it?

Yes. Apps are for adults only, and not for health, mood or therapy records, or for card, bank or ID numbers. Your AI will say no and offer something else.

All use cases

Put an AI button in your app today.

Paste one line into your AI.

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