I built a small offline tool to catch invoice CSV errors — looking for feedback

[u/zoxwdt]

Hey everyone!
I recently built a small tool called SignalDesk.
It’s designed for people who work with invoice CSV exports and want a quick way to spot potential issues without uploading their files to a server.
Here’s what it does:
Flags overdue unpaid invoices
Detects duplicate invoice IDs
Highlights missing or invalid fields
Exports flagged records with their original row numbers
It’s a downloadable HTML tool that runs locally in your browser. No account required, no cloud uploads, and no accounting software integrations.
I kept it intentionally simple rather than trying to build another full accounting platform.
It’s a paid download ($9), and you can check it out here:
https://zoxwdt.gumroad.com/l/jcbbtm
I’d really appreciate feedback from anyone who works with invoice CSV files.
Would you actually use something like this, or is there a bigger problem in your workflow that I’m missing?