SaaS

Sell small used-car dealers a per-car profit tracker

Build a simple online tool for independent used-car dealers. It adds up the purchase price, repairs, fees, and sale price of each car to show the real profit. Dealers pay a monthly subscription so they can stop relying on spreadsheets that hide their margins.

The hard part: reaching independent dealers, who rarely shop for software online and are used to their spreadsheets.

Setup 2 weeksRuns $10/moYour time A few hours a weekNeeds ClaudeSupabaseVercelStripe

Who pays

Independent dealers pay a small monthly subscription to see what they actually made on each car. One builder reports $293 in monthly recurring revenue from 26 paying dealers, which is their own claim. They did not publish their price, so set your own plan price and test it with your first dealers.

How to build it

  1. Talk to a few local dealers

    Visit or call three to five independent lots and ask how they track costs on each car today. Write down every cost type they mention, such as auction fees, transport, repairs, detailing, and title fees.

  2. Build the car cost tracker

    Use Claude Code or Cursor to build a web app where a dealer adds a car, logs each cost as it happens, and enters the sale price. Store the data in Supabase and host the app on Vercel.

  3. Show profit per car clearly

    Make the main screen a list of cars with total cost, sale price, and real profit for each one, plus monthly totals. Let dealers import their existing spreadsheet so they don't have to start over.

  4. Add a monthly subscription

    Add Stripe Checkout with one simple monthly plan and a short free trial.

  5. Find dealers where they gather

    Post in dealer Facebook groups and forums, and visit nearby lots in person with a demo on your phone. Share your progress in public on X, as the source poster does.

Sources on X

  • aydmaxxx · Jul 15, 2026

    aydmaxxx reports $293 MRR from 26 paying dealers and 373 active users in the last 28 days. These are the poster's own figures. The tool shows real profit on every car, covering purchase, repairs, fees, and sale, and the poster says dealers pay monthly 'because spreadsheets hide their margin.'

Ideas are curated from public posts and untested by us. Read the full note.