#C63A17
Closest named color: Sinopia (#BB3E03). oklch(55.3% 0.182 34.4), rgb(198, 58, 23).
Aa
White text reads best on this color (5.22:1).
About this color
#C63A17 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 0.024 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 | 4.01:1 |
| White text | 5.22:1 |
Values
| HEX | #C63A17 |
| RGB | rgb(198, 58, 23) |
| HSL | hsl(12, 79%, 43%) |
| OKLCH | oklch(55.3% 0.182 34.4) |
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 #C63A17 | 5.22:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #C63A17 | 4.01:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #C63A17 text on white | 5.22:1 | AA | Lc 74.7 | Content text, not long reading |
| #C63A17 text on black | 4.01:1 | 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
#F9E5DF
oklch(93.6% 0.023 37.4)
-
Step 200
200
#F6CFC5
oklch(88.5% 0.046 34.7)
-
Step 300
300
#F0AE9D
oklch(80.8% 0.082 35)
-
Step 400
400
#E68068
oklch(70.7% 0.131 34.2)
-
Step 500
500
#DC5B3D
oklch(63.2% 0.168 34.5)
-
Step 600
600 (this color)
#C63A17
oklch(55.3% 0.182 34.4)
-
Step 700
700
#AC2B08
oklch(49.1% 0.17 34.3)
-
Step 800
800
#8B260D
oklch(42.6% 0.14 34.4)
-
Step 900
900
#702614
oklch(37.8% 0.109 34.8)
-
Step 950
950
#42170D
oklch(27% 0.07 34.5)
#C63A17 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) | #64590F | 0.191 |
| Deuteranopia (no green cones) | #87780B | 0.172 |
| Tritanopia (no blue cones) | #DA0034 | 0.064 |
| Achromatopsia (no color) | #6C6C6C | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C63A17
#C63A17
oklch(55.3% 0.182 34.4)
- #008095
#008095
oklch(55.2% 0.097 214.5)
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 #C63A17, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.024
- Brick Orange #C14A09 ΔE 0.030
- Dull Red #BB3F3F ΔE 0.039
- Burnt Orange #C04E01 ΔE 0.039
- Rust Orange #C45508 ΔE 0.051
- Burnt Siena #B75203 ΔE 0.052
- Rusty Red #AF2F0D ΔE 0.054
- Dusty Red #B9484E ΔE 0.054
Use #C63A17 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.