redwarmCSS named color
Red #FF0000
Pure red at maximum saturation; the strongest attention color.
Use cases: Alerts · CTAs
Color values
| Format | Value | |
|---|---|---|
| HEX | #FF0000 | |
| RGB | rgb(255, 0, 0) | |
| HSL | hsl(0, 100%, 50%) | |
| HSV | hsv(0, 100%, 100%) | |
| CMYK | cmyk(0%, 100%, 100%, 0%) | |
| XYZ | xyz(41.2456, 21.2673, 1.9334) | |
| CIE-LAB | lab(53.2, 80.1, 67.2) | |
| Luminance | 0.213 (WCAG relative) |
/* Red */
color: #ff0000;
background-color: #ff0000;
Shade scale
Perceptual 50–950 scale, interpolated in CIE-LAB. Step 500 is the base color. Edit in the shade generator →
Shades (toward black)
#e60000 #cc0000 #b30000 #990000 #800000 #660000 #4d0000 #330000 #1a0000 #000000
Tints (toward white)
#ff1a1a #ff3333 #ff4d4d #ff6666 #ff8080 #ff9999 #ffb3b3 #ffcccc #ffe6e6 #ffffff
Tones (toward gray)
#f20d0d #e61a1a #d92626 #cc3333 #c04040 #b34d4d #a65a5a #996666 #8d7373 #808080
Color harmonies
Complementary
Edit in generator →#FF0000
#00FFFF
#ff0000 #00ffff
Analogous
Edit in generator →#FF0080
#FF0000
#FF8000
#ff0080 #ff0000 #ff8000
Triadic
Edit in generator →#FF0000
#00FF00
#0000FF
#ff0000 #00ff00 #0000ff
Tetradic
Edit in generator →#FF0000
#80FF00
#00FFFF
#7F00FF
#ff0000 #80ff00 #00ffff #7f00ff
Split Complementary
Edit in generator →#FF0000
#00FF80
#007FFF
#ff0000 #00ff80 #007fff
Monochromatic
Edit in generator →#850000
#C20000
#FF0000
#FF3D3D
#FF7A7A
#850000 #c20000 #ff0000 #ff3d3d #ff7a7a
Accessibility & contrast
4.00
#FF0000 on #FFFFFF
AA text ✗AA large ✓AAA text ✗UI 3:1 ✓
5.25
#FF0000 on #000000
AA text ✓AA large ✓AAA text ✗UI 3:1 ✓
Best text on red
5.25
#000000 text
WCAG 2.1: AA needs ≥4.5:1 for normal text, ≥3:1 for large text and UI components; AAA needs ≥7:1 / ≥4.5:1.
Color blindness preview
Simulation using the Machado et al. (2009) physiological model, severity 1.0. This is an approximation of perception — not a medical assessment.
Closest named colors
Nearest matches by CIEDE2000 perceptual distance (ΔE₀₀).
| Color | Name | ΔE₀₀ |
|---|---|---|
| Rust #B7410E | 13.34 | |
| Crimson #DC143C | 13.76 | |
| Terracotta #C96F4A | 14.18 | |
| Adobe #BD6C48 | 15.25 | |
| Coral #FF7F50 | 15.49 | |
| Clay #B66A50 | 15.78 |
Related colors
Palettes with red
Values computed from the sRGB color model. CMYK is the naive sRGB conversion without an ICC profile. RGB percentages may differ between color-managed applications.