Build a local bookkeeping system with Claude
They used Claude to help plan and ship a self-hosted finance tool that sorted expenses, created a review queue, and replaced paid accounting software.
- What they did
- They began with a broad accounting outline from ChatGPT, then had Claude turn that outline into a step-by-step implementation plan. Codex was used to check for missing pieces, and the updated plan went back through Claude’s UltraPlan several times before they started building.
- How it went
- In two days, they had a Mac-based app running end to end, plus a simple Android dashboard. It processed a few thousand transactions, tagged them to Schedule C categories, and moved uncertain items into review; their yearly spend dropped from about $524 to a $60 bank-feed charge. The live bank-data connection was the part that took the most trial and error, and they still had a professional review the books.
- Tips
- This approach makes sense for a small, mostly passive LLC where a human still checks the output. Expect the bank-feed integration to take the most work, even if the rest of the system comes together quickly.
Try it yourself with Claude
I want to create a local bookkeeping tool for my [small business/freelance operation] that takes the place of [current paid software]. Start by asking about my workflow, then draft a simple architecture I can run on my own hardware and an implementation plan broken into small steps. After each major step, stop and ask for my approval before continuing, especially before anything irreversible such as payments, sending, deleting, or submitting. The system should import bank transactions through [bank connection method], attach them to [tax category scheme], send uncertain entries to a review queue, turn my edits into reusable rules, and produce an accountant-ready export in [format]. Include a basic [desktop/mobile] dashboard too.
Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.
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