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Build a mini-app with AI, no coding: 20 ideas you can finish in an afternoon
Updated · Level: Beginner · Every product fact comes from the vendor's own pages.
You can build a small working tool, like a chore chart or a price calculator, by describing it in plain English to an AI assistant. Below are 20 ideas you can finish in an afternoon, 8 copy-paste starter prompts and a template for describing your own.
What counts as a mini-app?
A mini-app is a single-page tool that runs in your web browser. It has buttons, boxes to type in and results that update, and some can remember what you entered. Think of a calculator, a checklist or a tracker, not something you'd find in an app store.
Mini-apps suit jobs a spreadsheet does clumsily and nobody sells exactly the way you want. They're the wrong choice for anything that takes payments, handles logins or holds sensitive information about other people. For those, or a tool that works with files on your computer, move up to a coding agent; see AI coding tools compared.
Which AI can build an app for me?
Here's what each assistant offers as of Oct 26, 2026. Prices are in US dollars, can differ by country, and taxes are extra.
| Assistant | Which plans | How to start | Saves data? | Sharing |
|---|---|---|---|---|
| Grok (Grok Build) | X Subscription Plus US$8.00/month · CA$9.99 13 and up, from one weekly usage pool 3 | Install Grok Build and run it in a folder on your computer. It's a coding agent that runs in a terminal window, so it suits bigger projects more than quick mini-apps 4 | Whatever you build; files stay on your computer | You host and share it yourself |
| Claude (artifacts) | All plans, including Free 1 | Describe the app in any chat, or start from the Artifacts tab | Pro and up: up to 20 MB of text per app, personal or shared 1 | Private at first. Pro and Max: by link or email invite, and viewers need a Claude account 5 |
| Gemini (Canvas) | Free, signed in to Gemini 2 | On gemini.google.com, choose Canvas below the text box | Yes, across sessions and devices | By public link, which opens on the web only. Anyone with the link can view and edit the app's data 2 |
| ChatGPT (Sites) | Plus US$20.00/month, Pro, Business and Enterprise; not Free or Go 6 | Select Work and ask for a "website" | Yes, a database of up to 10 GB per Site | Private at first. Invite people, who sign in, or publish publicly where allowed 6 |
- Grok: Grok Studio is no longer supported, and xAI points users to Grok Build instead. 7
- Claude: an app can use Claude's AI inside it with no API key. Each person who uses it spends their own plan's allowance, not yours. Apps that use Claude or your connected apps can't be shared by public link. 1,5
- Gemini: adding Gemini's AI features to an app needs you to be 18 or over. 2
- ChatGPT: building or editing a Site counts toward your Codex usage. 6
- Copilot: Microsoft is previewing Copilot Code, a Code tab in the Copilot app that builds small apps, through its Frontier early-access program; personal accounts need a supported Copilot plan. 8
The best builder to start with is usually the assistant you already use. The ideas and prompts below work in any of them.
How do I describe the app I want?
Vague requests get generic apps. Answer four questions before you type, and you'll skip most of the back-and-forth:
- Who uses it, and on what? You on your phone, your kids on a tablet, volunteers on whatever they own.
- What does it do? One sentence, then the actions people take: tap, type, choose, print.
- What does it remember? Nothing (it resets when closed), your own data, or shared data that everyone sees.
- How should it look and feel? Big buttons for kids, calm and clean for a budget, printable for a quote.
Here's a reusable template. Fill in what you know and delete the rest.
Prompt: fill-in app template
App name: [name]
Who uses it: [me / my kids with me / customers / volunteers], on [phone / laptop / tablet].
What it does: [one sentence].
What people do in it: [e.g. tap a chore to mark it done, enter a price, add a name to a shift].
What it shows or calculates: [totals, progress, a printable summary].
What it remembers: [nothing / my own data between visits / shared data everyone sees]. If you can't save data here, tell me before you build.
Look and feel: [e.g. big buttons, calm colors, readable on a phone, playful for kids].
Never: [collect contact details / need a login / use outside services].
Keep version one small: build the core feature only, then suggest 3 improvements.
Before you finish, check it with these examples: [input → expected result].
The last line matters most. Two or three examples with the right answers make the AI check its own math and logic.
20 mini-app ideas, grouped by where they help
The 8 marked "prompt below" have full starter prompts in the next section.
Home
- Chore chart with stars: kids tap a chore to earn a star toward a reward (prompt below).
- Meal planner: plan a week of dinners and get a grocery list grouped by aisle.
- Family budget: enter income and bills and see what's left in each category.
- Allowance tracker: each child's earnings, spending and savings goal.
- Reading log: books and minutes, with a progress bar toward a family goal.
Learning
- Phonics blending game: tap letter sounds, then blend them into a word (prompt below).
- Times-tables quiz: one table at a time, with gentle repeats of missed facts.
- Spelling practice: hear this week's words read aloud, then type them.
Small business
- Quote calculator: pick services and get a clean, printable quote (prompt below).
- Marketplace fee and price calculator: see your real profit after an Etsy-style shop's fees (prompt below).
- Invoice generator: fill in a form and get a numbered invoice to print or save.
- Inventory tracker: count stock, flag low items and list what to reorder.
Nonprofits and volunteering
- Volunteer sign-up: shifts with spots left, filled in by volunteers (prompt below).
- Silent auction catalogue and bid tracker: items, bids and winners in one place (prompt below).
- Donation thermometer: a goal graphic you update as gifts come in.
Personal
- Habit tracker: tap habits each day and watch your streaks (prompt below).
- Trip planner: days, bookings, packing list and budget together.
- Gift list: people, ideas, budget, and bought or not.
Fun
- Party game: themed trivia or charades cards with a timer and score.
- Scavenger hunt generator: fresh, printable hunts for kids at the tap of a button (prompt below).
Starter prompts for the best 8
1. Chore chart with stars
Prompt: chore chart with stars
Each child gets a column of chores with simple picture icons: [make bed, feed the cat, put toys away, set the table].
Tapping a chore gives a star and a short celebration animation. Show stars earned this week and a goal of [20] stars for [reward].
Add a parent-only "edit chores" area and a "new week" button that resets the stars.
Big buttons, bright friendly colors, works on a tablet. Remember the stars between visits if this tool can save data.
2. Phonics blending game
Prompt: phonics blending game
Show one three-letter word at a time, made only from those letters, as big separate letters.
Each letter lights up when tapped, then a "Blend it!" button joins them into the word.
Add a "Say it" button that reads the word aloud if the browser supports speech.
Use only real, kid-friendly words, with a matching picture (an emoji is fine).
10 words per round, then a "You did it!" screen. No timers and no scores that go down.
Play it all the way through yourself before your child does, and listen for words the browser voice mispronounces. More learning-game ideas are in 15 ways to use leftover AI usage.
3. Marketplace fee and price calculator
Prompt: marketplace fee and price calculator
Inputs: item price, shipping charged, materials cost, time spent in minutes, and my hourly rate.
Fee settings I can edit, pre-filled with these current fees from the platform's own fee page: [listing fee], [transaction fee and what it applies to], [payment processing fee].
Show total fees, my profit, my profit margin, and the price I'd need to hit a target margin of [40]%.
Add a table comparing 5 price points side by side. Clean layout that works on a phone.
Copy each fee from the platform's current fee page (for Etsy, its Fees & Payments Policy) rather than from memory or an old blog post. Fees differ by country and change from time to time, which is why the prompt makes them editable.
4. Quote calculator
Prompt: quote calculator
Services and prices: [service: price per hour or per job], [service: price], [add-on: price].
I enter: customer first name, services chosen, hours or quantity, travel distance, and any discount.
Calculate the subtotal, a travel fee of [$X] beyond [Y] km, tax at [rate]%, the total, and a [25]% deposit.
Show a printable quote with my business name [name], today's date, a quote number and "valid for 30 days".
Add a "copy as text" button so I can paste the quote into an email.
5. Volunteer sign-up sheet
Prompt: volunteer sign-up sheet
Shifts: [setup 8–10 am, needs 4], [games table 10 am–12 pm, needs 3], [cleanup 2–4 pm, needs 5].
Volunteers add a first name and last initial to a shift. Show spots left and mark full shifts.
Everyone who opens it should see the same up-to-date list. If this tool can't do shared data, tell me before you build.
Add an organizer view that prints the list by shift. Don't collect phone numbers, emails or addresses.
Check how your volunteers will open it before you send the link. A shared Claude artifact needs each viewer to have a Claude account, and anyone with a Gemini app's public link can view and edit its data. 5,2 For a big group, a plain shared spreadsheet may be simpler.
6. Silent auction catalogue and bid tracker
Prompt: silent auction catalogue and bid tracker
Catalogue: item number, title, short description, donated by, value, starting bid and minimum raise. Show it as a clean list I can print.
Bid tracker: we enter bids from paper bid sheets using bidder numbers only, never names. Show the current high bid per item, flag any bid below the minimum raise, and total the amount raised.
At closing: a winners list by bidder number with amounts owed, and a list of items with no bids.
Let me add items by pasting rows from a spreadsheet.
Bidder numbers keep names and phone numbers out of the app. Keep the list that matches numbers to people on paper or in your own files.
7. Habit tracker
Prompt: habit tracker
Habits: [walk 20 minutes], [read 10 pages], [no phone after 9 pm]. Let me add, rename or remove habits.
Each day I tap a habit to mark it done. Show a 4-week grid, my current streak and my best streak for each habit.
Calm colors and big tap targets that work on my phone. Remember my data between visits if this tool can save data.
No guilt messages: a missed day just stays blank.
8. Scavenger hunt generator
Prompt: scavenger hunt generator
Settings: indoors or outdoors, season, number of items ([6–12]), and "can read" or "picture clues".
Each tap of "New hunt" picks a fresh list from a built-in collection of at least 60 safe, easy-to-find items. Nothing sharp, hot or dangerous, and nothing near roads or water.
Show a printable checklist with a box beside each item and a title I can type, like "[Nickname]'s Backyard Hunt".
Add a "rhyming clues" option for a treasure-hunt version.
How do I fix bugs and add features?
Your first version will be close, not perfect. Improve it like this:
- Get the core working first. Add extras only once the main job works.
- Make one change per message. Several changes at once make it hard to tell what broke what.
- Describe bugs plainly. Say what you did, what you expected and what happened instead.
- Test like a real user. Try it on a phone, and type silly inputs: blank, zero, a huge number.
- Start fresh when it goes in circles. Open a new chat, paste in the current version and summarize what it should do.
This bug-report prompt works in any assistant:
Prompt: bug report
Device: [phone / laptop], browser: [name].
Error message, if any: [paste it].
Fix only this. Don't change anything else, and tell me in one sentence what you changed.
Building uses more allowance than chatting, and long build chats add up. Anthropic, for one, lists artifacts among the things that use up Claude's limits faster. 9 If you have allowance left before a reset, a mini-app is a good use of it; see 15 ways to use leftover AI usage.
Can I share my app, and what about privacy?
Yes, but treat a shared link like a flyer: assume it can travel further than you meant.
- Claude: artifacts start private. On Pro and Max you can share by link or invite people by email, and everyone who opens it needs a Claude account. On Team and Enterprise, artifacts stay inside the organization by default. 5
- Gemini: a Canvas app is shared by public link. If the app saves data, anyone with the link can view and edit that data. 2
- ChatGPT: a new Site stays private until you change who has access. You can invite specific people, who sign in to view it, or publish it for anyone where public publishing is allowed. Deploying a change updates the live Site, so save a version and review it first. 6
Whatever you use, follow three rules:
- Keep personal details out. Use nicknames, first names or numbers instead of full names, addresses, phone numbers or anything about other people's health or money.
- Know what's shared. Shared data is visible to everyone who uses the app, so keep a family budget in personal storage or off shared links.
- Skip payments and sensitive data. OpenAI's rules for Sites, for example, forbid processing health records or payment-card data except through a third-party payment processor. 6
For kids' apps, run them on your own device and account. Claude requires users to be 18, Gemini is 13 and up in most countries, and ChatGPT requires users to be at least 13 (or the local minimum age). 10,11,12 For privacy settings in each assistant, see how to stay safe with AI.
Common questions
5 quick questions, answered
Do I need to know how to code to build a mini-app with AI?
No. You describe what you want in plain English and test the result like any user would. Knowing a little helps you describe bugs, but the AI writes and fixes the code.
Which AI is best for building small apps?
None is best for everyone. Claude artifacts and Gemini Canvas both build apps on free plans, ChatGPT Sites suits a small website on Plus or Pro, and Grok Build is a coding agent for bigger projects on your own computer. The one you already use is usually the best place to start.
Can my mini-app save data?
Usually, with conditions. Claude artifacts can store up to 20 MB of text each on Pro and higher, but not on Free. Gemini Canvas apps can save data across sessions and devices, and each ChatGPT Site has a database of up to 10 GB.
Can I sell a mini-app I made with AI?
Selling software brings support, security and legal questions that a one-file app isn't built for. A safer route is to use a mini-app to run your own small business better, like the quote and price calculators above.
Is it safe to put my family's information in an AI-built app?
Keep it light. Use nicknames and leave out addresses, birthdays, schools and health details, and keep money-related apps off shared links. If you share a link, assume anyone who gets it can see what's inside.
Related: Use leftover AI usage · AI coding tools compared · Get the most out of AI · Should I pay for AI? · All AI plans and prices
Tip: subscribe on the website, not in the app
Buying through the iPhone or iPad app often costs more because of Apple's App Store fees. Sign up on the provider's own site (like claude.ai or chatgpt.com) and you can still use the app with the same account. How to switch and what to know · Compare app and website prices.
Sources (13)
- Claude Help: What are artifacts and how do I use them?
- Gemini Apps Help: Create docs, apps and more with Canvas
- x.ai/pricing
- xAI docs: Grok Build
- Claude Help: Share artifacts
- OpenAI Help: Creating and using ChatGPT Sites
- xAI docs: Grok FAQ
- Microsoft Learn: Copilot Code (Frontier) requirements
- Claude Help Center: Usage limit best practices
- Anthropic Consumer Terms
- Gemini Apps Help: Age requirements
- OpenAI Terms of Use
- grok.com (Canada), checked Oct 23, 2026
Last checked Oct 26, 2026. Drafted with AI, tested and edited by me.