Rossum is an enterprise intelligent-document-processing platform built for high-volume accounts payable: cognitive capture, a validation UI, approvals and enterprise contracts. For a large finance operation, that's a lot of value in one place.
pdftojson is the opposite shape. It's a self-serve developer API: sign up, get a key, POST a PDF, get structured data back, on flat monthly pricing with a free tier.
Where pdftojson is different
Rossum is a strong fit if you're a large finance team automating accounts payable and you want a platform with a validation UI and a rollout to match. That comes with enterprise onboarding and pricing. pdftojson is for the developer who just wants the data: sign up, POST a PDF, get structured output back.
For statements it reconciles the transactions against the opening and closing balances out of the box and flags any that don't add up.