I’m validating a private PDF/DOCX comparison tool before building it

I’m validating a small Windows desktop tool before spending time building it.

The idea is called Redline Local.

It would compare documents entirely on your PC:

• PDF ↔ PDF
• DOCX ↔ DOCX
• PDF ↔ DOCX
• side-by-side text differences
• exportable redline
• no uploads or cloud processing

The planned price is €39 one-time, with no subscription.

I’m mainly trying to answer two questions:

1. Is the value proposition immediately clear?
2. Would local/offline document comparison be useful enough to pay €39 once?

The product does not exist yet — this is deliberately a pre-launch validation test.

Landing page:

https://redline-local-6eg0ogl13-digitalmax.vercel.app/

Feedback is very welcome, especially from anyone who regularly works with revised contracts, PDFs, Word documents, procurement files, or translation/review workflows.