#CA370D
Closest named color: Sinopia (#BB3E03). oklch(55.7% 0.19 34.8), rgb(202, 55, 13).
Aa
White text reads best on this color (5.16:1).
About this color
#CA370D is a medium-dark, vivid red. In OKLCH its lightness is 56%, its chroma 0.190 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.030 away. White text reads best on it, at 5.16:1.
| Hue family | Reds |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.190) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 4.06:1 |
| White text | 5.16:1 |
Values
| HEX | #CA370D |
| RGB | rgb(202, 55, 13) |
| HSL | hsl(13, 88%, 42%) |
| OKLCH | oklch(55.7% 0.19 34.8) |
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 #CA370D | 5.16:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #CA370D | 4.06:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #CA370D text on white | 5.16:1 | AA | Lc 74.2 | Content text, not long reading |
| #CA370D text on black | 4.06:1 | AA large text | Lc -27.5 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#FAE4DF
oklch(93.5% 0.025 32.9)
-
Step 200
200
#F7CFC4
oklch(88.6% 0.048 35.9)
-
Step 300
300
#F2AD9C
oklch(80.9% 0.085 34.3)
-
Step 400
400
#E87F65
oklch(70.7% 0.135 34.9)
-
Step 500
500
#DE5838
oklch(63% 0.174 34.7)
-
Step 600
600 (this color)
#CA370D
oklch(55.7% 0.19 34.8)
-
Step 700
700
#AD2900
oklch(49.1% 0.173 34.7)
-
Step 800
800
#8D2305
oklch(42.6% 0.146 34.8)
-
Step 900
900
#722411
oklch(37.8% 0.114 34.7)
-
Step 950
950
#43160C
oklch(27% 0.072 34.1)
#CA370D 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) | #655800 | 0.198 |
| Deuteranopia (no green cones) | #897900 | 0.178 |
| Tritanopia (no blue cones) | #DF0031 | 0.062 |
| Achromatopsia (no color) | #6D6D6D | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CA370D
#CA370D
oklch(55.7% 0.19 34.8)
- #008197
#008197
oklch(55.5% 0.098 215.2)
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 #CA370D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.030
- Brick Orange #C14A09 ΔE 0.034
- Burnt Orange #C04E01 ΔE 0.042
- Dull Red #BB3F3F ΔE 0.046
- Rust Orange #C45508 ΔE 0.053
- Burnt Siena #B75203 ΔE 0.056
- Deep Orange #DC4D01 ΔE 0.057
- Rusty Red #AF2F0D ΔE 0.059
Use #CA370D 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.