Replace Google Forms with a custom customer app for a one-person business with Claude Code

Source checked Oct 30, 2026
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I run a one-person business on seven Google Forms, one Google Sheet, Stripe and Gmail, and I check every row by hand. Build me a web app where customers enter their own vehicles and drivers, license plates and addresses are checked against official data and invoices come from the live vehicle count.

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Before you start, ask me 1–3 short questions about the details below and wait for my answers. Once I've answered, confirm the plan in one line and run the whole task start to finish.

Goal: Replace my spreadsheet-and-forms setup with a simple app that stops bad data at entry and saves me admin time.

Questions to ask me first:
- What does your current setup look like (forms, sheets, payment and email tools)?
- Which typos or mistakes cost you the most?
- What do customers need to do themselves?

Inputs (fill in or confirm):
- Current tools and how data flows between them: [CURRENT SETUP]
- The fields where mistakes happen most: [ERROR FIELDS]
- Official data sources I could check against: [DATA SOURCES]
- Payment and email tools: [TOOLS]

Rules:
- Explain each choice in plain words, since I don't write code.
- Validate key fields against official data before saving them.
- Never touch my live spreadsheet; import a copy, and stop to ask me about records that contradict each other.
- Set up secure sign-in and per-role permissions, and list the security checks I should repeat each week.

Checkpoint: Build the single process that costs me the most time first, and show it to me before adding features.

If you get stuck: If an outside service or API fails, show me the error and the simplest fix.

Verify before you finish: Test the app with ten real records from my sheet and show me which would have been rejected and why.

Output: A working app, a step-by-step setup guide, a data import plan and a weekly security checklist.

Done when: Customers enter their own data, mistakes are blocked at entry and I spend far less time on admin.

AI tool

Claude Code

Outcome

Maarten runs a one-person business in the Netherlands registering repair crews' vehicles and mechanics for a parking exemption, and for five years it ran on seven Google Forms, one Google Sheet, Stripe and Gmail, with every row checked by hand and every card laminated at the kitchen table. After months stuck in a no-code tool, Maarten installed Claude Code at the start of 2026 and by the end of that day had the things that had been blocking progress for months. The new app checks license plates against the Dutch roads authority's open API and addresses against a national database, generates invoices automatically and lets clients manage their own fleets, with a CSV import for one client with 800 vehicles. Cleaning five years of old data took a week or two. By Maarten's own estimates, operations now take about 4 hours a week, down from about 8.

Evidence: Article or interviewA newsletter, journalist or interview account of what happened.

Source

Posted: Sep 15, 2026 by Create With (case study interview)
Last checked: Oct 30, 2026
Method:: How we verify

https://createwith.com/blog/we-re-changing-direction

Context: Hours and costs are Maarten's own estimates; the app costs about €354 a month to run, plus a Claude subscription. Revenue also grew, but the business was growing anyway.