extractio doesn't require the user to make any templates and can be used for any generic document layout.
A perfect use case for extractio would be resumes - candidates submit many different resume layouts, but it would be able to parse out the name, positions, email, etc. without making a template for each layout.
I'm building Pariso (parsio.io) that can parse invoices, receipts etc. They all may have different layout :)
What have you seen as the most common use case for something like Parsio vs Docparser?
As for the use cases, we have all kind of it.
For emails, our customers parse submitted forms and leads to Google Sheets and CRM, extract booking data from Airbnb confirmations, exporting Etsy orders to Trello, extract and filiter HARO queries.
For PDFs and scanned documents, we have businesses parsing invoices, receipts, quotes, contracts, business cards etc.