[Source](https://sheaf.us/ocr-scoreboards.html)

Evals

# OCR scoreboards

Evals of reading a page: OCR engines, their settings, and what is built on their output.

## The scoreboards

| Scoreboard | What it measures | Created | Updated |
| --- | --- | --- | --- |
| [OCR accuracy](scoreboard-ocr-accuracy.md) | Which checked values each OCR engine reads correctly, from the PDF and from the page image, with time and cost. | Oct 8 2026 | — |
| [Grounding](scoreboard-grounding.md) | Where each grounding option puts a checked value: its own bounding box, its row or line, or its block. | Oct 7 2026 | — |
| [Table formats](scoreboard-table-formats.md) | How OCR engines write a table: HTML, Markdown or other, and whether merged table cells survive. | Oct 3 2026 | — |
| [Form blocks by engine](scoreboard-form-blocks-by-engine.md) | The block types Mistral, Landing AI and Reducto have for the parts of a form. | Oct 3 2026 | — |
| [Mistral OCR settings](scoreboard-mistral-ocr-settings.md) | What Mistral OCR 4.1's page annotation corrects on form pages, and what it costs. | Oct 3 2026 | — |
| [Chinese OCR](scoreboard-chinese-ocr.md) | Chinese OCR models: precision, speed, hosted price, bounding boxes and input. | Oct 3 2026 | — |
| [Form review variations](scoreboard-form-review-variations.md) | The Level 2 form review on handwritten pages, by model, picture and scope. | Oct 3 2026 | — |
| [Forms · Level 2 Parse](scoreboard-forms-level-2.md) | Second passes that correct Mistral OCR's reading of a form page. | Oct 3 2026 | — |
| [Forms · Level 1](scoreboard-forms-level-1.md) | OCR engines on the same form pages, scored against ground truth. | Oct 3 2026 | — |

## Recent changes

## Glossary

| Term | Definition |
| --- | --- |
| OCR | Optical character recognition: reading the text, tables and marks of a page from its image or PDF. |
| engine | An OCR product or model that reads a page and returns its text, such as Mistral OCR, Landing AI or Reducto. |
| block | One part of a page as an engine returns it: a paragraph, a table, a heading or a figure. |
| bounding box | The rectangle that marks where something is printed on the page. |
| table cell | One value of a table, where a row and a column meet. |
| form field | A label on a form and the value written for it. |
| grounding | Linking each value of a reading to its bounding box on the page. |
| ground truth | The correct answers for a page, one fact per value, checkbox, choice or signature. Every reading is scored against them. |
| test set | The pages a scoreboard is measured on, with their ground truth. |
| grader | The program or model that compares a reading with the ground truth and counts what is right. |