About 8% of men and 0.5% of women are colorblind — and most stream designs don't account for them. Here's how to design captions and overlays that work for every viewer, and how StreamTranslate gives you the control to do it right.
Add Accessible Captions to Your StreamColorblindness affects roughly 1 in 12 men and 1 in 200 women. The most common form is red-green colorblindness (deuteranopia and protanopia), which makes it difficult or impossible to distinguish reds from greens. Blue-yellow colorblindness (tritanopia) is rarer. Achromatopsia, which involves seeing no color at all, is the rarest form.
For stream design, colorblindness matters most when color is used as the only way to convey meaning. A red health bar that turns green when full is invisible to deuteranopia viewers. Caption text that appears in red against a dark background has poor contrast for protanopia viewers. Green text on a dark green background is essentially invisible to many colorblind viewers.
The good news: accessible caption design isn't complicated. High contrast is the most important factor. A simple white text with a dark semi-transparent background stroke reads clearly regardless of colorblindness type, viewing environment, or display calibration.
White or light yellow text on a dark semi-transparent background. Minimum 4.5:1 contrast ratio per WCAG AA standard. This works for all colorblindness types and in all lighting conditions.
Never use color alone to differentiate caption speakers or caption types. Use position, shape, or text labels alongside any color coding to ensure all viewers get the same information.
Adjust caption text color, background opacity, and positioning through the StreamTranslate dashboard and OBS browser source properties. Dial in exactly the style that works for your layout.
Text color: White (#FFFFFF) or light yellow (#FFFF99) are the safest choices. Both maintain high contrast against dark backgrounds regardless of colorblindness type. Avoid pure red text (#FF0000) — it disappears for protanopia viewers and has poor contrast against both light and dark backgrounds.
Background: A semi-transparent dark background behind your caption text dramatically improves readability over complex game backgrounds. Even a 60-70% opacity black overlay behind your caption strip makes text legible regardless of what's happening in the game behind it.
Font size: Minimum 40-48px for standard stream resolutions. Larger text improves readability for viewers with low vision and makes captions accessible on mobile devices where streams appear smaller.
Position: The lower third of the screen is the standard caption position. Avoid placing captions over busy UI elements, health bars, or minimap areas — not just for colorblind viewers but for all viewers who need to see both the game and the captions simultaneously.
StreamTranslate renders captions via OBS browser source, giving you full control over position, size, and styling. Setup guide here or check pricing.
White or light yellow text on a dark semi-transparent background works for all forms of colorblindness. Avoid pure red/green color coding without secondary indicators. High contrast ratios of 4.5:1 or higher per WCAG are the most important factor.
Yes. StreamTranslate captions are rendered via an OBS browser source, which can be styled through the StreamTranslate dashboard and OBS source properties. You can adjust text color, background opacity, font size, and position.
The main types are deuteranopia (red-green, most common), protanopia (red-green, affects reds specifically), tritanopia (blue-yellow, rare), and achromatopsia (no color vision). Designing with high contrast and no color-only information covers all types.
Yes. Placing captions over busy, multi-colored backgrounds reduces readability for all viewers and especially colorblind ones. A dedicated dark strip at the bottom or a semi-opaque background behind text improves all viewers experience.
Minimum 40-48px for stream captions viewed on standard monitors. For mobile viewers, larger is better. StreamTranslate default sizing is designed for readability across devices, and font size can be adjusted via OBS browser source properties.