#C63A1B
Closest named color: Sinopia (#BB3E03). oklch(55.3% 0.182 33.7), rgb(198, 58, 27).
Aa
White text reads best on this color (5.22:1).
About this color
#C63A1B is a medium-dark, vivid red. In OKLCH its lightness is 55%, its chroma 0.182 and its hue 34°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.026 away. White text reads best on it, at 5.22:1.
| Hue family | Reds |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.182) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 4.02:1 |
| White text | 5.22:1 |
Values
| HEX | #C63A1B |
| RGB | rgb(198, 58, 27) |
| HSL | hsl(11, 76%, 44%) |
| OKLCH | oklch(55.3% 0.182 33.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #C63A1B | 5.22:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #C63A1B | 4.02:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #C63A1B text on white | 5.22:1 | AA | Lc 74.6 | Content text, not long reading |
| #C63A1B text on black | 4.02:1 | AA large text | Lc -27.1 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#F9E5E0
oklch(93.7% 0.023 34.3)
-
Step 200
200
#F6CFC6
oklch(88.5% 0.046 33.2)
-
Step 300
300
#F0AE9E
oklch(80.9% 0.081 34.1)
-
Step 400
400
#E68069
oklch(70.7% 0.131 33.7)
-
Step 500
500
#DB5B3F
oklch(63% 0.167 33.9)
-
Step 600
600 (this color)
#C63A1B
oklch(55.3% 0.182 33.7)
-
Step 700
700
#AB2B0D
oklch(49% 0.169 33.6)
-
Step 800
800
#8B2610
oklch(42.6% 0.14 33.6)
-
Step 900
900
#702616
oklch(37.8% 0.108 33.8)
-
Step 950
950
#42170E
oklch(27% 0.069 33.5)
#C63A1B with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #645915 | 0.190 |
| Deuteranopia (no green cones) | #877811 | 0.172 |
| Tritanopia (no blue cones) | #DA0035 | 0.064 |
| Achromatopsia (no color) | #6C6C6C | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C63A1B
#C63A1B
oklch(55.3% 0.182 33.7)
- #008195
#008195
oklch(55.4% 0.097 213.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #C63A1B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.026
- Brick Orange #C14A09 ΔE 0.032
- Dull Red #BB3F3F ΔE 0.037
- Burnt Orange #C04E01 ΔE 0.040
- Dusty Red #B9484E ΔE 0.052
- Rust Orange #C45508 ΔE 0.052
- Burnt Siena #B75203 ΔE 0.053
- Rusty Red #AF2F0D ΔE 0.054
Use #C63A1B in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.