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DaltonLens
DaltonLens offers desktop color filters and color information tools for people with color blindness, alongside technical articles.
About DaltonLens
DaltonLens provides software for people with color blindness and technical posts about color vision deficiency. Its Desktop utility for macOS, Windows and Linux runs as a tray program with a global shortcut, showing color information below the pointer, capturing screen areas to apply color filters, and highlighting pixels with similar colors for reading color-coded charts and plots.
It also offers an online color blindness simulator that compares simulation methods using predefined or uploaded images, a Python toolbox for simulators, Ishihara-like plates and confusion-line visualization, and a single-file public domain C library of simulation algorithms.
Key features
- Show color information below the pointer
- Capture screen area and apply color filters
- Highlight pixels with similar colors for charts
- Online simulator compares methods using predefined or uploaded images
- Generate Ishihara-like plates and visualize confusion lines
- Single-file public domain C library for simulation algorithms
Best for: People with color blindness who need color information and filters, and developers researching vision deficiency algorithms.
Good for
- Desktop tool combines pointer color readout, filtered screen capture and similar-color highlighting
- Online simulator allows comparison of methods on predefined or uploaded images
- Provides Python toolbox and C library for simulation development
DaltonLens at a glance
- Website
- daltonlens.org
- Category
- Software & Utilities › Hardware & Diagnostics
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- iOS, Linux, macOS, Web, Windows
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
DaltonLens alternatives
Tools and sites you could use instead, ranked by how closely they match.
Glances monitors system activity and is available for GNU/Linux, BSD, macOS, and Windows.
NVDA provides screen reading support for Microsoft Windows and is free and open source.
Toptal’s color filter tool simulates color vision anomalies by applying a selected filter to a web page.
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DaltonLens FAQ
What can DaltonLens for Desktop do?
It shows color information below the pointer, captures a screen area to apply color filters, and highlights pixels with similar colors.
Can I use my own images with the online simulator?
Yes, the simulator works with predefined images or images you upload.
What is DaltonLens-Python used for?
It is a toolbox for research and development with simulator implementations and tools to generate Ishihara-like plates and visualize confusion lines.
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