The best AI side project ideas are small tools that fix a problem you, or someone you know, runs into every week. With an AI coding agent or app builder, you describe the idea in plain words and get a working first version in an evening or a weekend.
Below are thirty ideas in five groups, each with a difficulty level and a first prompt to paste in.
- Choose a project you would use, can explain in one sentence and can finish in a weekend.
- Easy means one page and no logins. Medium saves data or calls a service. Stretch involves accounts, personal data or money.
- “AI inside” projects call an AI model while they run, so each use costs a little.
- Ask the agent for a plan first, then build the smallest version that works.
How to pick the right idea
The best idea is the one you finish, so pick something small that you would use yourself.
| Level | What it involves | Rough time |
|---|---|---|
| Easy | One page, runs in the browser, no logins, nothing stored online | An evening |
| Medium | Saves data, calls an outside service, or runs a small server | A weekend |
| Stretch | Accounts, other people’s personal data, or money | Several weekends, plus a security review |
AI inside means the finished app calls an AI model while it runs, for example to read a photo. That needs an API key, a secret password for a paid service, which belongs on a server and never in the page. Each call costs a little. Here is how to keep API keys safe.
Tools for yourself
Start here if you are new. You are the only user, so nothing has to be perfect. Several of these also work well as a browser add-on, which our guide to building a Chrome extension with AI walks through.
Every subscription, its renewal date and your yearly total.
First prompt: “Build a one-page app to list my subscriptions with price, billing cycle and renewal date. Show the yearly total and flag renewals due within 14 days.”
Reminds you to stay in touch with people who matter.
First prompt: “Build a contact tracker: name, how we met, last contact and how often I want to be in touch. Put overdue people first. Save data in the browser.”
A timer that records what you did in each session.
First prompt: “Build a 25-minute focus timer. After each session, ask what I worked on and save it. Show a weekly summary of hours per project.”
Turns a folder of receipt photos into a spreadsheet.
First prompt: “Build a script that reads each receipt photo in a folder, uses an AI model to extract date, shop and total, and saves them to receipts.csv.”
Turns rambling voice notes into a to-do list.
First prompt: “Build an app that transcribes a voice memo I upload, pulls out tasks and due dates, and adds them to a checklist.”
Suggests dinners from what you already have.
First prompt: “Build an app where I type my ingredients and dietary limits, and an AI model suggests five dinners plus a shopping list for what is missing.”
Tools for local businesses
Build for a café, salon or tradesperson you know, after asking what wastes their week.
Lets a cleaner’s customers price a job instantly.
First prompt: “Build a quote calculator for a house cleaner. Inputs: bedrooms, bathrooms, extras. Show the price with a breakdown and a button to request a booking by email.”
A phone menu the owner can update without a designer.
First prompt: “Build a mobile-first café menu with prices and allergen notes, plus a printable QR code that links to it. Keep the menu in one easy-to-edit file.”
Drafts replies to new reviews for the owner to approve.
First prompt: “Build a tool where a shop owner pastes a review and gets three reply drafts in their tone: short, warm and apologetic. Never post anything automatically.”
Collects appointment requests and emails them to the owner.
First prompt: “Build a booking request page for a barber: service, preferred times, name and phone number. Email each request to the owner and show a confirmation. No payments.”
Shows what is on the shelf, fed by a spreadsheet.
First prompt: “Build a page listing a shop’s products and whether each is in stock, read from a Google Sheet the owner edits. Add search.”
A stamp card on the customer’s phone instead of paper.
First prompt: “Plan a digital loyalty card for a coffee shop: a stamp per visit via a staff code, a free drink after nine. List the risks, then the simplest safe design.”
Content sites
You write the substance and AI builds the site. Google warns that generating many pages “without adding value for users” can break its spam rules.
Your hand-picked guide to the best of your town.
First prompt: “Build a one-page guide called [Best dog walks in town]. I will write the entries. Give each a photo, a short review, a map link and tags.”
Plain-English definitions for the jargon in your field.
First prompt: “Build a glossary site for [bookkeeping] terms with search and A to Z navigation. Help me draft plain definitions of the terms I supply.”
Recipes that rescale to any serving size and switch units.
First prompt: “Build a recipe site where each recipe rescales to any number of servings and switches between metric and US units. I will paste three recipes.”
A comparison of gear or apps you have actually used.
First prompt: “Build a comparison site for [beginner film cameras]: a sortable table plus a page per item with room for my own notes and photos.”
Past issues as a searchable site that gathers subscribers.
First prompt: “Build a site from my newsletter archive, a folder of text files. One page per issue, tags, a search box and a sign-up form at the bottom.”
A chat box that answers visitors from your own articles.
First prompt: “Plan a chat box that answers questions using only my published articles, links its source and admits when it does not know. Label it clearly as AI.”
Small games
Keep version one to a single screen and rule. For art and sound, see our guide to AI game assets.
One themed word a day for everyone.
First prompt: “Build a daily word puzzle: guess a five-letter word from my themed list in six tries, with color hints and a shareable result. One word per day for everyone.”
A quiz about your club, town or hobby.
First prompt: “Build a 10-question trivia game about [our running club] with a timer, a score and a results screen. I will supply the questions and answers.”
Type the falling words before they land.
First prompt: “Build a typing game where falling words vanish when typed. Speed up every 30 seconds and keep a high score in the browser.”
An illustrated story where readers pick what happens next.
First prompt: “Build a choose-your-path story engine where each scene has text, an image and two or three choices. Start with a ten-scene story I will outline.”
A clicker game that keeps baking while you are away.
First prompt: “Build an idle game about a bakery: click to bake, buy ovens that bake on their own, unlock upgrades. Save progress in the browser. Pixel-art style.”
A shared screen asks, and players answer on their phones.
First prompt: “Plan a party quiz: a shared screen shows questions and players answer on their phones via a room code. Start with the simplest design and its running costs.”
Data projects
Use data you already own, or public data you are allowed to reuse.
Where your money went, charted from your bank’s export file.
First prompt: “Build a page where I drop in my bank’s CSV export and see spending by category and month. Keep everything on my computer and upload nothing.”
Shows where your calendar hours really go.
First prompt: “Build a tool that reads an exported calendar file (.ics) and shows hours in meetings per week, by person and by type, for the last three months.”
Pages per month, favorite authors and your longest streak.
First prompt: “Build a reading tracker that imports my book list from a CSV and shows pages per month, top authors and my longest reading streak.”
Your planting notes next to the real weather.
First prompt: “Build a garden log of what I plant and when, with daily rain and temperature for my town from the Open-Meteo API charted alongside.”
Public playgrounds, benches or trees, mapped from your city’s data.
First prompt: “Build a map of [my city’s] public playgrounds from the city’s open data file, with filters and a count per neighborhood. Credit the source on the page.”
Plain-English questions about your sales, answered with charts.
First prompt: “Build a tool where I upload a sales spreadsheet and ask questions in plain English. Answer with a chart and show the exact calculation so I can check it.”
Open-Meteo’s free weather API needs no key, but it is for non-commercial use only.
From first prompt to a working project
Ask for a plan before code
Paste the first prompt and add: “Before writing code, list the screens, the data you will store and anything you need from me.” Fix the plan, then tell it to start.
Build the smallest version
Get one path working end to end, then add one feature at a time and test after each.
Try it like a user
Use it on your phone with real data. Then hand it to one person and watch without helping. If the idea belongs on a phone more than a browser tab, our guide to building a mobile app with AI covers the extra steps.
Protect what matters
Keep keys out of the code, collect only the data you need, and put a real login in front of anything private.
Put it online
Publish it to a real address and share it with the people it was for. Our plan to ship an MVP in a weekend covers launch day.
FAQ
Do I need to know how to code to build these?
Not for the Easy ones: an AI builder or coding agent writes the code from your description. For Medium and Stretch ideas, learn where your data lives, how API keys work and how logins protect data as you go.
How much does it cost to build a side project with AI?
Often nothing to start. As of September 2026, ChatGPT Plus and Claude Pro, which include the Codex and Claude Code agents, cost $20 a month. Cyborb, our own agent, has a free plan and a $20 Pro plan. AI inside projects also pay per use, so set a spending cap where you can.
Can a side project make money?
Some do. Treat money as a later step: first check that people keep using it without being asked. Add payments only once login and data security are solid. If it takes off, our guide to building a SaaS with AI covers turning it into a subscription business.
New to building with AI? Start with what vibe coding is, then build a website with AI.
- Using generative AI content on your website, Google Search Central, December 2025
- Open-Meteo pricing, Open-Meteo, accessed September 2026
- ChatGPT plans and pricing, OpenAI, accessed September 2026
- Claude pricing, Anthropic, accessed September 2026




