Color Or Die

What Color Or Die Actually Does

It’s a macOS app that applies a real-time color transformation across your entire screen using CoreImage filters. The goal is to remap colors so people with red-green color vision deficiencies can distinguish things they normally can’t. It’s not a cure. It doesn’t fix your eyes. It just shifts the spectrum in ways that make certain combinations of red and green look more different from each other. I’ve been using it off and on for a few years. Bought it after my optometrist told me I have deuteranomaly — the most common form of red-green colorblindness. At first I was skeptical. Then I ran it next to my old x-chromaticity app and the difference was immediately noticeable on spreadsheets and code editors.

Getting Color Or Die Installed

You download it from the official website at colordie.com. There’s a free trial that runs for 14 days with full functionality, which is enough to tell you whether the filter actually helps your specific type of deficiency. After that it’s a one-time purchase, no subscription. The app is around $10-15 depending on current pricing. Installation is straightforward. You drag the app into your Applications folder, then launch it. On macOS 12 Monterey and later, you’ll be prompted to grant Accessibility permissions when you first try to activate the screen tint. Go to System Settings > Privacy & Security > Accessibility and toggle it on. Without that permission the app can’t draw its overlay on top of other windows. Here’s where people hit a wall. If you’re running multiple monitors with different color profiles, or if you use a GPU that does hardware-accelerated compositing in an unusual way, the initial color shift can look wrong or miss areas. I ran into this with a dual-monitor setup where one display was calibrated and the other wasn’t. The filter applied correctly to the calibrated screen but looked garbled on the uncalibrated one. The fix was to run the app’s built-in calibration dialog and manually adjust the color mapping for each display independently. The dialog lets you preview the effect by clicking through different test patterns.

How the Filters Actually Work

The app uses CoreImage’s color matrix and range reduction operators. What that means in practice is that it takes the RGB values coming from your GPU and applies a transformation matrix before they hit the display. The default filter for deuteranomaly shifts reds toward yellow and greens toward cyan, pushing them further apart on the chromaticity diagram. For protanomaly it does something similar but accounts for the fact that red perception is shifted differently. The counter-intuitive thing nobody mentions: stronger isn’t always better. I spent weeks running the intensity at 80 percent because I thought more correction meant better results. It didn’t. At high intensity the colors started looking unnatural and honestly harder to read, not easier. My skin tones in photos looked orange and grass looked neon. Settled on around 35-40 percent intensity and it worked noticeably better for the tasks that actually matter — reading data, editing photos, telling UI elements apart. Another thing beginners miss: the app has a preset for each common deficiency type (protanopia, deuteranopia, protanomaly, deuteranomaly, tritanopia), but those presets are based on average responses. If you have a mild form of the condition, the “protanopia” preset will overcorrect and make everything look weird. The workaround is to start with the closest preset, then dial the intensity down until it feels natural. There’s no automated calibration for your personal severity level, so you’re doing the tuning yourself.

When It Doesn’t Help

The app won’t do anything for tritan defects beyond the tritan preset, which itself is quite limited. Blue-yellow colorblindness is rarer and the filter options are fewer. If you have achromatopsia — complete color blindness — it’s irrelevant since there’s no color information to remap. It also struggles with content that’s already rendered in HDR. When applications use the Display P3 wide gamut or Dolby Vision outputs, the color transformation can introduce banding or shift hues in unexpected ways because the filter operates on the standard SDR color space before the content gets tone-mapped. I noticed this when watching Netflix through Safari — the overlay would make skies look purple in some scenes. Switching to the app’s built-in browser or using a non-HDR content source avoids the problem. If you use any kind of color-calibrated reference workflow — print proofing, broadcast color grading — turn it off. The transformation will ruin your white point and make your monitoring inaccurate. I learned that the hard way when I was checking a client’s print job and realized the blues looked completely wrong. Saved about two hours of backtracking after figuring out the app was still active.

Practical Setup Tips

Start by running the Color Or Die test chart in the app. It shows you how the filter changes a standard color vision test plate. If you can read the numbers in the filtered version but not without it, the app is doing what it should. Create a keyboard shortcut for toggling the app on and off. The built-in hotkey works but defaults to something you’ll constantly press accidentally. I use Command+Option+C and it’s much less annoying. This matters because there are moments when you genuinely want the unfiltered view — watching movies, picking out clothes, anything where accurate color matters more than distinction. If you use Chrome or Safari as your main browser, the app works fine. Firefox has occasional issues with WebGL content where the color transform causes flickering on video streams. This is a browser-side bug, not an app bug, and it happens about once every few weeks. The workaround is to switch to the app’s embedded browser for video-heavy pages.

The app does not persist its state across logins on older macOS versions. If you’re on Ventura or earlier, you need to add it to Login Items in System Settings or use a tool like Lingon to create a launch agent. On Sonoma and later it generally remembers its last state, but I’ve seen it reset after major OS updates. A five-second habit of re-enabling it after an update saves frustration.

Who Should Consider Color Or Die

People with mild to moderate red-green deficiencies who use a Mac primarily for work tasks involving color discrimination. The spreadsheet users, the photographers, the coders who need to tell syntax-highlighted blocks apart. It’s not worth it if you only occasionally notice color confusion, or if your primary device isn’t a Mac. Windows users should look at other options like Color Oracle or EnChroma glasses instead. The free trial is enough to make the call. Run it for a few days across your actual work tasks, not just the test charts. If you find yourself reaching for the toggle on and off throughout the day, that’s your answer. If you forget it’s running after an hour, it probably isn’t helping enough to justify keeping it on constantly.