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More in Bookkeeping, receipts & invoices.

Build a free freelancer invoicing and expense tool with Claude Code

WorkedEvidence: Described by posterPosted Last checked

Joel Henry used Claude Code to build Kova, a free invoicing and expense tracker for contractors, after finding no lightweight tool.

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  4. Send it, then read the answer before acting on it.
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Prompt

Recreated prompt

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What the prompt labels mean

The person didn't share their exact words, so we wrote this from what they described. We haven't tested it, and they didn't use this exact version.

Help me build a simple invoicing and expense tracker for a solo contractor. It should create invoices, log income and expenses, and export a clean yearly summary for tax time. Keep it lightweight, with no features I don't need, and explain the architecture so I understand what ships.

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ChatGPT Gemini Grok Claude

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Optional stronger version

Our rewrite with extra checks. The poster didn't test it.

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: Build a lightweight invoicing and expense tracker that gets a solo contractor ready for tax time.

Questions to ask me first:
- Which currency and tax-year rules apply?
- Do invoices need your logo, payment terms or numbering format?
- Where should the data live (local file, database, hosted)?

Inputs (fill in or confirm):
- Invoice fields: [CLIENT / ITEMS / TERMS]
- Expense categories: [LIST]
- Tax year and currency: [DETAILS]
- Hosting preference: [LOCAL / HOSTED]

Rules:
- Keep features to invoices, income, expenses and a yearly summary.
- Explain each major file before writing it.
- Add tests for totals and tax-year boundaries.
- No third-party services without asking.

Checkpoint: Show the data model and screen list before writing code.

If you get stuck: If a tax rule is unclear, add a placeholder and ask instead of guessing.

Verify before you finish: Create two sample invoices and three expenses, then confirm the yearly summary totals match.

Output: A working app, setup steps and a one-page explanation of the architecture.

Done when: I can invoice a client and export a correct yearly summary.

AI tool

Claude Code

Outcome

Joel Henry, a contractor in Jamaica, dreaded tax season and couldn't find a lightweight tool for invoices plus income and expense tracking; the options were bloated, too expensive or not built for contractors. Henry, a developer, used Claude Code to build Kova, an invoicing and expense tracker for exactly that problem, going from idea to working product faster than Henry could have alone, and released it free and public. Henry cautions that developers should review and understand what the AI generates instead of leaning on it blindly.

Evidence: Described by posterThe person describes what happened in words, without screenshots or video.

Source

Posted
by Joel Henry
Last checked
Method:
How we verify

https://console-logs.hashnode.dev/i-built-my-own-invoicing-tool-using-ai-here-s-why-that-matters

Context: Short firsthand post with no metrics or exact prompt. Henry is a professional developer and links the tool's source code.

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