Closest named color · ΔE 0.4
#F40407
Closest named color · ΔE 0.4
#F40407
Does it pop as a button? Stay readable as a background? Survive at badge size?
If an entire site used it as the primary color, it would feel like this —
Body copy goes here. The primary drives buttons and links, tints fill backgrounds, text uses the highest-contrast color.
Get startedHarmonious schemes generated from color theory.
How this color performs against black and white text.
White text on this background
Aa Ratio 4.31:1
Black text on this background
Aa Ratio 4.87:1
:root {
--color: #F40407;
--color-rgb: 244, 4, 7;
--color-hsl: 359.3, 96.8%, 48.6%;
}
.bg-color { background-color: #F40407; }
.text-on-color { color: #000000; }
.border-color { border-color: #F40407; }
.gradient {
background-image: linear-gradient(90deg, #F40407 0%, FF0000 100%);
}Nearest official code in each standard system, ranked by CIEDE2000.
Official color from public brand materials (simple-icons CC0 dataset)
What the ancients would have called this color.
The same color, as named in Japanese tradition.
Based on the Machado (2009) model - see how this color appears to 8 types of color vision.
Normal vision
#F40407
Standard trichromatic vision with all three cone types functioning.
Protanomaly
#7A1507
Abnormal L cone sensitivity (~1% of men). Weakened red perception.
Protanopia
#282006
Missing L cones (~1% of men). Reds are hard to perceive.
Deuteranomaly
#982C05
Abnormal M cone sensitivity (~6% of men). The most common deficiency.
Deuteranopia
#5B4704
Missing M cones (~1% of men). Reds and greens are confused.
Tritanomaly
#FF0006
Abnormal S cone sensitivity (extremely rare). Weakened blue-yellow perception.
Tritanopia
#FF0006
Missing S cones (extremely rare). Blues and yellows are confused.
Achromatomaly
#992B2D
Severely weakened color vision (~0.001%). Colors appear washed out.
Achromatopsia
#373737
No color vision at all (~0.003%). The world is shades of grey.
Closest names by CIEDE2000 perceptual distance.
Colors one step away in the RGB space — each with its own profile page.
Common derivatives of this color: lighter / darker / more saturated / less saturated, plus inverted, grayscale, web-safe and the nearest HTML named color. Click any to open its page.
Copy-paste snippets: foreground text, background, text shadow and a complementary gradient.
Text readability sample
color: #F40407;Text readability sample
background-color: #F40407;Text readability sample
text-shadow: 0.1em 0.1em 0.15em #F40407;linear-gradient(90deg, #F40407, #04F4F1)Drag hue, saturation and lightness to preview live - find the version that feels right.
This is the color with hex code #F40407. Its RGB channels are 244, 4, 7; the closest human-readable name is "Assassin’s Red" (ΔE 0.4, CIEDE2000).
#F40407 is rgb(244, 4, 7) in RGB, hsl(359.3, 96.8%, 48.6%) in HSL and cmyk(0%, 98.4%, 97.1%, 4.3%) in CMYK.
Its complement #04F4F1 works best, along with triadic and analogous harmonies - see the harmony section below to copy full palettes.
Contrast with black text is 4.87:1 and with white text 4.31:1. WCAG 2.1 requires at least 4.5:1 for body text (AA) and 3:1 for large text.