What is difference between Pro and ProPDF plans

I am just about to sign up for one of the PRO plans.
My primary interest is to OCR PDF files. I thought I could do this with the Pro Plan. Is this not the case?
Do I need the PRO Pdf plan? what is the difference? TIA

You are correct: For ocr’ing PDF you will need the PRO PDF plan.

The PRO plan is for images (JPG, PNG,…).

The PRO PDF plan can do both, PDF documents and images.