# Ishihara Color Vision Test

> Free online Ishihara-style color vision test. AI-generated pseudoisochromatic plates, 15 plates per run, 92% accuracy vs lab screening, 13 languages, instant results, no sign-up, no account. Suitable for preliminary screening - not a medical diagnosis.

The test runs entirely in the browser. Anonymous session IDs are used to aggregate analytics and serve localized result PDFs. Color plates are generated by an algorithm trained on published Ishihara plate literature (Ishihara S., 1917; Birch J., 2006) rather than scanned copies.

Operated by Websy s.r.o. (Slovakia). Contact: tompokryvka@gmail.com.

## Core pages

- [Take the test (English, US)](https://ishiharatest.com/en-us/): Main entry point. 15-plate Ishihara test with instant scoring and localized result explanation.
- [Take the test (English, UK)](https://ishiharatest.com/en-gb/): British English variant.
- [Take the test (German)](https://ishiharatest.com/de/): Deutsche Version des Tests.
- [Take the test (French)](https://ishiharatest.com/fr/): Version française du test.
- [Take the test (Spanish)](https://ishiharatest.com/es/): Versión española.
- [Take the test (Italian)](https://ishiharatest.com/it/): Versione italiana.
- [Take the test (Polish)](https://ishiharatest.com/pl/): Polska wersja.
- [Take the test (Czech)](https://ishiharatest.com/cs/): Česká verze.
- [Take the test (Slovak)](https://ishiharatest.com/sk/): Slovenská verzia.
- [Take the test (Brazilian Portuguese)](https://ishiharatest.com/pt-br/): Versão brasileira.
- [Take the test (Hindi)](https://ishiharatest.com/hi/): हिन्दी संस्करण.
- [Take the test (Thai)](https://ishiharatest.com/th/): เวอร์ชันภาษาไทย.
- [Take the test (Turkish)](https://ishiharatest.com/tr/): Türkçe sürüm.

## Reference

- [About the test](https://ishiharatest.com/en-us/about/): How the online Ishihara test works, who it is for, known limitations (screen calibration, monitor color space, not a substitute for a clinical exam).
- [Research and methodology](https://ishiharatest.com/en-us/research/): Scientific background, algorithm parameters for plate generation, validation approach, and references.
- [Types of color vision deficiency](https://ishiharatest.com/en-us/guide/types/): Guide to protanopia, deuteranopia, tritanopia and milder anomalous trichromacies, with prevalence and inheritance.
- [Embed the test on your site](https://ishiharatest.com/en-us/share/): Free embeddable iframe widget with selectable test modes, for schools, clinics and HR teams.
- [Privacy policy](https://ishiharatest.com/en-us/privacy/): What anonymous data is collected (session ID, test answers, language, device class), how it is used (aggregate stats), user rights.
- [Contact](https://ishiharatest.com/en-us/contact/): Company details (Websy s.r.o., Slovakia) and support email.

## Machine-readable

- [Full markdown export](https://ishiharatest.com/llms-full.txt): Longer plain-markdown description of the test, methodology and FAQ for LLM ingestion.
- [Sitemap](https://ishiharatest.com/sitemap.xml): XML sitemap with hreflang alternates for all 13 language variants.