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Mark Fulton
Mark Fulton

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Things to Build With an AI Coding Agent and Sell: 5 Ideas for This Month

You can describe software in plain English now and get it built. That part is solved. The hard part is picking something a stranger will pay for.

Here are five things worth building with an AI coding agent this month. Blunt version.

Free stuff to grab first

  • The open source AI Employees. Eight roles, all MIT licensed: GTM Engineer, SEO/AEO, Web Dev, Social Media, Ad Manager, Sales, Customer Satisfaction and a Chief of Staff. The page says every plan, including Free, opens the GitHub repo. Grab the AI Employees
  • Claude Code docs. Runs in the desktop app, your IDE and the browser. A paid subscription is required for some surfaces. Read the overview
  • Supabase Free plan. $0 a month, 500 MB database, 50,000 monthly active users, 2 active projects. Supabase pricing
  • Vercel Hobby plan. $0 a month. One catch: the FAQ says Hobby is for personal, non-commercial use. Once you charge money, read that line. Vercel pricing

I only link pages I opened today.

1. A small tool for one specific job

Not a platform. One job.

Example: billable.dev is a free invoice generator for developers. It pulls line items from your git history, you set hours and rate, you print a PDF. No account, no watermark. Pro is $4 a month billed every six months, or $79 once.

The page is honest about what it is not. It is not a billing system. It does not email clients or charge cards.

A narrow tool with a clear "not this" beats a wide tool nobody understands.

2. A done-for-you setup for a boring business

Plenty of owners will pay someone to set up a working workflow. They do not want to learn it. They want it running.

Pick one trade. Bookkeepers, dentists, local gyms. Build the same small workflow once, then adapt it.

3. A kit people buy and customize

Templates, starter repos, prompt packs with real structure. Sell it once, sell it again.

Build the thing, then package it so a buyer can change the name and ship it as theirs. A license that says so is part of the product.

4. A directory or lookup site in a niche you know

I'm a former domain reseller and blogger. I know a few corners of the internet well enough to see what is missing. You do too.

A directory needs three things: data that is useful, a page per entry, and a reason to come back. An agent can do the page building. You supply the taste.

5. Launch help for other builders

Everyone who builds something hits the same wall. Nobody sees it.

That is why I built Favors.dev, a marketing co-op for founders. The page says it is free to join. You get 50 points on signup and 200 more after your first favor. You earn points by helping other founders (reviews, shares, testimonials, feedback). You spend them on help with your own launch. Points are earned, never bought, and are released only after the work is verified.

Not every favor is equal. The page lists reviews at +50 and testimonials at +500.

If you are about to launch something from this list, that is where I'd start.

What to do this week

  • Pick one of the five. Not two.
  • Write one sentence: who pays, for what, how much.
  • Build the smallest version an actual person could use.
  • Show it to ten people before you add a feature.

I build some things for myself and some for people I know need them. The second kind is where the surprises are.

One more thing

If you are building in public and want company, the Vibe Coding is Life community is free. There is a Facebook group and a Skool community. Come say which of the five you picked.

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