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OCR Challenge Lab

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Every week there is a screenshot with something wrong in it. Find the bugs, rewrite them, and get a real score. The kind of bug a DOM test lets through.

Challenge of the Week

Week of 5 October 2026

Easy

The invoice for a US customer

You will practise: Currency symbol against the customer’s region

Invoice number 1042. Region: United States. Subtotal €1,234.56. Total €1,234.56.

This invoice was generated for a customer in the United States. Find what is wrong, then rewrite it as it should read.

What is wrong? Tick every problem you can see.

How It Works

  1. 1

    Look at the screenshot

    Read it the way a customer would. Add up the numbers. Check the dates against the country.

  2. 2

    Name the bugs and rewrite them

    Tick the kinds of bug you see, then type the text as it should read. Wrong guesses cost points.

  3. 3

    See what a test would catch

    You get a score, the reason for each bug and the one-line RenderCheck assertion that fails on it.

Grading runs in your browser and the answers are in the page, so this is practice, not a contest. Nothing you type is sent anywhere.

Practice

  • The invoice for a US customerThis week

    Currency symbol against the customer’s region

    easy

  • A Swiss receipt in German

    Locale date order, one currency per document, and sums

    hard

  • The Arabic welcome card

    Right-to-left text and clipped boxes

    hard

Use RenderCheck in your tests

These challenges are practice. In production, RenderCheck runs the same checks in Playwright and Cypress, on your machine, with no upload.

Learn RenderCheckRead the developer docs