Developer Seeks Best OCR Tool to Grade Handwritten Gaokao Math Answers

A developer building an English-language Gaokao math exam platform is searching for a reliable OCR solution to automatically grade handwritten student responses. The challenge is complex because answers often span half a page and include fractions, square roots, crossed-out formulas, and geometry diagrams written under time pressure. Tools under consideration include Mathpix, MyScript iink, Google Cloud Vision, Azure Document Intelligence, and the open-source model TrOCR, each with distinct trade-offs between accuracy and implementation effort. The developer plans to use separate recognizers for formulas and plain handwriting, retain positional and confidence data for each recognized element, and flag unreadable lines as provisional rather than defaulting to a zero score. A real-world test set using authentic Gaokao-style handwriting, including messy and crossed-out samples, is yet to be built before any tool is adopted.