One of the most fascinating (and challenging) parts of building this was seeing just how wildly different the "best" model can be depending on the document type.

For example, during testing, I found that Marker is an absolute champion for clean, single-column layouts like blog posts. But throw a dense, multi-column academic paper at it, and MinerU often produces a far superior, structured output with proper LaTeX. Then, for a complex invoice table, PP-StructureV3 frequently beats both of them.

This really solidified my belief that a "one-size-fits-all" parser is a myth. The future seems to be less about finding a single perfect model and more about building a quick, effective workflow for selecting the right specialist for the job. It's a classic "routing" problem, and this tool is my attempt at solving the first step of that puzzle.