#CB3503
Closest named color: Sinopia (#BB3E03). oklch(55.6% 0.193 35.1), rgb(203, 53, 3).
Aa
White text reads best on this color (5.18:1).
About this color
#CB3503 is a medium-dark, vivid red. In OKLCH its lightness is 56%, its chroma 0.193 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.032 away. White text reads best on it, at 5.18:1.
| Hue family | Reds |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.193) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 4.04:1 |
| White text | 5.18:1 |
Values
| HEX | #CB3503 |
| RGB | rgb(203, 53, 3) |
| HSL | hsl(15, 97%, 40%) |
| OKLCH | oklch(55.6% 0.193 35.1) |
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 #CB3503 | 5.18:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #CB3503 | 4.04:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #CB3503 text on white | 5.18:1 | AA | Lc 74.2 | Content text, not long reading |
| #CB3503 text on black | 4.04:1 | 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
#F3AD9B
oklch(80.9% 0.087 35)
-
Step 400
400
#E97E63
oklch(70.7% 0.138 35.2)
-
Step 500
500
#DF5735
oklch(63% 0.177 35.1)
-
Step 600
600 (this color)
#CB3503
oklch(55.6% 0.193 35.1)
-
Step 700
700
#AC2A00
oklch(49% 0.172 35)
-
Step 800
800
#8E2201
oklch(42.7% 0.148 35.2)
-
Step 900
900
#72230F
oklch(37.7% 0.115 35)
-
Step 950
950
#43160B
oklch(27% 0.073 35)
#CB3503 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) | #645800 | 0.201 |
| Deuteranopia (no green cones) | #897900 | 0.179 |
| Tritanopia (no blue cones) | #E0002E | 0.061 |
| Achromatopsia (no color) | #6D6D6D | 0.194 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CB3503
#CB3503
oklch(55.6% 0.193 35.1)
- #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 #CB3503, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.032
- Brick Orange #C14A09 ΔE 0.035
- Burnt Orange #C04E01 ΔE 0.044
- Dull Red #BB3F3F ΔE 0.049
- Rust Orange #C45508 ΔE 0.055
- Deep Orange #DC4D01 ΔE 0.057
- Burnt Siena #B75203 ΔE 0.058
- Cherry #CF0234 ΔE 0.060
Use #CB3503 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.