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Craig Mod: Built a Custom Accounting System in 5 Days with Claude via Vibe-Coding
Craig Mod documented vibe-coding a complete custom accounting software solution in five days using Claude, replacing a commercial SaaS tool for his specific needs. Simon Willison highlighted this as a concrete example of the SaaS replacement pattern — individual builders now shipping domain-specific internal tools faster than traditional development cycles. Adds qualitative signal to Cursor/Retool data showing 35% of internal tooling being replaced by bespoke vibe-coded alternatives.
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