#A9180B
Closest named color: Rufous (#AE2012). oklch(47.1% 0.18 30.1), rgb(169, 24, 11).
Aa
White text reads best on this color (7.44:1).
About this color
#A9180B is a medium-dark, vivid red. In OKLCH its lightness is 47%, its chroma 0.180 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.015 away. White text reads best on it, at 7.44:1.
| Hue family | Reds |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.180) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 2.82:1 |
| White text | 7.44:1 |
Values
| HEX | #A9180B |
| RGB | rgb(169, 24, 11) |
| HSL | hsl(5, 88%, 35%) |
| OKLCH | oklch(47.1% 0.18 30.1) |
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 #A9180B | 7.44:1 | AAA | Lc -88.9 | Fine for body text |
| Black text on #A9180B | 2.82:1 | Fails | Lc 20.1 | Dividers and decoration only |
| #A9180B text on white | 7.44:1 | AAA | Lc 83.9 | Fine for body text |
| #A9180B text on black | 2.82:1 | Fails | Lc -18.0 | 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 700.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FAE4E0
oklch(93.6% 0.025 29.9)
-
Step 200
200
#F8CEC6
oklch(88.5% 0.049 30.7)
-
Step 300
300
#F4AC9F
oklch(81% 0.087 30.5)
-
Step 400
400
#EA7C6B
oklch(70.6% 0.139 30.1)
-
Step 500
500
#E05543
oklch(63.1% 0.177 30.1)
-
Step 600
600
#CC3122
oklch(55.6% 0.194 29.9)
-
Step 700
700 (this color)
#A9180B
oklch(47.1% 0.18 30.1)
-
Step 800
800
#8F1F14
oklch(42.7% 0.149 30)
-
Step 900
900
#732118
oklch(37.7% 0.117 29.8)
-
Step 950
950
#44150F
oklch(27.1% 0.074 29.9)
#A9180B 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) | #4A4105 | 0.196 |
| Deuteranopia (no green cones) | #6D6000 | 0.174 |
| Tritanopia (no blue cones) | #BB0018 | 0.038 |
| Achromatopsia (no color) | #555555 | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A9180B
#A9180B
oklch(47.1% 0.18 30.1)
- #006774
#006774
oklch(47.1% 0.081 209.8)
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 #A9180B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.015
- Rust Red #AA2704 ΔE 0.019
- Burnt Red #9F2305 ΔE 0.022
- Brown #A52A2A ΔE 0.026
- Firebrick #B22222 ΔE 0.027
- Auburn #9B2226 ΔE 0.033
- Rusty Red #AF2F0D ΔE 0.034
- Carmine #9D0216 ΔE 0.036
Use #A9180B 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.