Is it legal to use AI to build an app? Mother isn't your lawyer.
November 12, 2026.
Yes. No US law or app store rule bans apps written with AI tools. The real questions are who owns the code, whether it copies someone else's, and how you treat your users' data. This is a summary of public sources, not legal advice.
Who owns the code AI writes for you?
The AI companies hand you their rights in what their tools make.
- OpenAI says you own the output, as far as the law allows.
- Anthropic gives you its rights in the output, "if any."
- Google says it won't claim ownership of what you generate.
OpenAI and Google both warn that other people may get the same or similar output. Owning the output is also not the same as having a copyright in it.
Can you copyright an app built with AI?
Often in part. The US Copyright Office looked at this in January 2025. Work can be protected where AI is a tool and a person decides the expressive parts. Prompts alone, it said, are unlikely to be enough.
In March 2025, a federal appeals court ruled in Thaler v. Perlmutter. A machine cannot be the author. A human must be. The Supreme Court declined to hear the case in March 2026.
So the parts you write, choose, arrange, or change are the parts most likely to be yours to protect. Your project history shows what you did.
Can AI copy someone else's code?
Sometimes. GitHub checks Copilot's suggestions against public code. It says matches happen in less than one percent of suggestions, and it can show the source and its license. If a match shows up, read that license before you keep the code.
Some paid business plans promise to defend you if the output is challenged for copyright. Microsoft, OpenAI and Anthropic offer this, with conditions. OpenAI and Anthropic exclude output you changed. The consumer terms we read offer no such promise.
Do the app stores allow apps built with AI?
Yes. No rule targets how the code was written. The rules are about what the app is.
- Apple rejects apps that copy others or are little more than a repackaged website. It also rejects apps made by a template or app generation service, unless the owner of the app's content submits them.
- If your app makes AI content, Apple asks for filtering, reporting, blocking, and contact details. Google Play holds you responsible for stopping offensive output.
- If your app sends personal data to an AI service, Apple requires you to say so and get permission first.
Who is responsible for your users' data?
You are. The FTC tells app developers that ready-made code gives them a head start, but they are their app's "last line of defense." If children under 13 use it, a separate law, COPPA, applies.
Watch what you paste into AI tools, too. On Google's free AI Studio tier, human reviewers may read what you send. Google says not to send personal information.
What about the EU AI Act?
Most apps aren't affected. The European Commission says the act sets no rules for AI with minimal or no risk. Its transparency rules started in August 2026. A chatbot must say it is a machine, and AI-made content must be identifiable.
Is there a safer starting point?
Software with a known license and a long history. Open source projects say exactly what you may do with the code. Our post on building a business app with AI for free shows how to start from one.
Search the directory by the product you would replace, or ask your coding agent:
/mothermachine <what you need>
What we do not cover yet
- Other countries. This covers US law, the two big app stores, and the EU AI Act.
- Your situation. We are not lawyers. Ask one before you sell an app or collect personal data.
Frequently asked questions
Is it legal to use AI to build an app?
Yes. No US law or app store rule bans apps written with AI tools. You are still responsible for what the app does and the data it holds.
Do I own the code AI writes for me?
The big AI companies give you whatever rights they have in it. Whether you can register a copyright depends on how much of it you made yourself.
Can I copyright an app I built with AI?
Often in part. The US Copyright Office says work where a human decides the expressive parts can be protected, but prompts alone are unlikely to be enough.
Will Apple reject an app built with AI?
Not for that reason. Apple rejects apps that are copies, repackaged websites, or made by a template service that submits for you.
Is this legal advice?
No. It is a summary of public sources. Ask a lawyer about your own app, especially before you sell it or collect personal data.
Sources
All read November 12, 2026.
- Copyright and Artificial Intelligence, Part 2: Copyrightability. US Copyright Office, January 2025.
- Thaler v. Perlmutter, No. 23-5233. US Court of Appeals for the D.C. Circuit, March 18, 2025.
- Docket 25-449. Supreme Court of the United States.
- Terms of use and Service terms. OpenAI.
- Consumer terms and Commercial terms. Anthropic.
- Gemini API additional terms. Google.
- Code referencing. GitHub.
- Copilot Copyright Commitment. Microsoft, September 7, 2023.
- App Review Guidelines. Apple.
- AI-generated content policy. Google Play.
- App developers: start with security. Federal Trade Commission.
- AI Act. European Commission.