#CB521D
Closest named color: Rust Orange (#C45508). oklch(59% 0.166 41), rgb(203, 82, 29).
Aa
Black text reads best on this color (4.76:1).
About this color
#CB521D is a medium-dark, vivid orange. In OKLCH its lightness is 59%, its chroma 0.166 and its hue 41°. Its hue sits on the warm side of the wheel. The nearest named color is Rust Orange (#C45508), ΔE 0.018 away. Black text reads best on it, at 4.76:1.
| Hue family | Oranges |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.166) |
| Temperature | warm |
| Nearest name | Rust Orange (#C45508) |
| Black text | 4.76:1 |
| White text | 4.40:1 |
Values
| HEX | #CB521D |
| RGB | rgb(203, 82, 29) |
| HSL | hsl(18, 75%, 45%) |
| OKLCH | oklch(59% 0.166 41) |
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 #CB521D | 4.40:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #CB521D | 4.76:1 | AA | Lc 34.4 | Non-text elements, placeholder text |
| #CB521D text on white | 4.40:1 | AA large text | Lc 69.7 | Content text, not long reading |
| #CB521D text on black | 4.76:1 | AA | Lc -31.9 | Non-text elements, placeholder text |
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
#FCF3F0
oklch(97% 0.011 39.4)
-
Step 100
100
#F7E5DF
oklch(93.5% 0.021 39.4)
-
Step 200
200
#F2D1C5
oklch(88.5% 0.041 41)
-
Step 300
300
#EBB19C
oklch(80.9% 0.074 40.8)
-
Step 400
400
#DF8665
oklch(70.7% 0.119 41)
-
Step 500
500
#D46438
oklch(63.2% 0.153 41)
-
Step 600
600 (this color)
#CB521D
oklch(59% 0.166 41)
-
Step 700
700
#A33900
oklch(49.1% 0.151 41.1)
-
Step 800
800
#862F05
oklch(42.8% 0.128 40.9)
-
Step 900
900
#6C2B11
oklch(37.8% 0.1 40.6)
-
Step 950
950
#3F1A0C
oklch(26.9% 0.063 40.6)
#CB521D 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) | #756713 | 0.162 |
| Deuteranopia (no green cones) | #928217 | 0.147 |
| Tritanopia (no blue cones) | #DF3348 | 0.078 |
| Achromatopsia (no color) | #787878 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #CB521D
#CB521D
oklch(59% 0.166 41)
- #008BAA
#008BAA
oklch(59% 0.108 220.9)
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 #CB521D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rust Orange #C45508 ΔE 0.018
- Rusty Orange #CD5909 ΔE 0.019
- Burnt Orange #C04E01 ΔE 0.026
- Brick Orange #C14A09 ΔE 0.028
- Deep Orange #DC4D01 ΔE 0.032
- Terra Cotta #C9643B ΔE 0.037
- Burnt Siena #B75203 ΔE 0.041
- Terracotta #CA6641 ΔE 0.043
Use #CB521D 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.