#A81100
Closest named color: Burnt Red (#9F2305). oklch(46.5% 0.183 30.7), rgb(168, 17, 0).
Aa
White text reads best on this color (7.64:1).
About this color
#A81100 is a medium-dark, vivid red. In OKLCH its lightness is 47%, its chroma 0.183 and its hue 31°. Its hue sits on the warm side of the wheel. The nearest named color is Burnt Red (#9F2305), ΔE 0.022 away. White text reads best on it, at 7.64:1.
| Hue family | Reds |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.183) |
| Temperature | warm |
| Nearest name | Burnt Red (#9F2305) |
| Black text | 2.74:1 |
| White text | 7.64:1 |
Values
| HEX | #A81100 |
| RGB | rgb(168, 17, 0) |
| HSL | hsl(6, 100%, 33%) |
| OKLCH | oklch(46.5% 0.183 30.7) |
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 #A81100 | 7.64:1 | AAA | Lc -89.4 | Fine for body text |
| Black text on #A81100 | 2.74:1 | Fails | Lc 19.6 | Dividers and decoration only |
| #A81100 text on white | 7.64:1 | AAA | Lc 84.4 | Fine for body text |
| #A81100 text on black | 2.74:1 | Fails | Lc -17.5 | 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 700.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FBE4E0
oklch(93.6% 0.026 29.4)
-
Step 200
200
#F8CEC6
oklch(88.5% 0.049 30.7)
-
Step 300
300
#F4AC9E
oklch(80.9% 0.088 31.3)
-
Step 400
400
#EB7B69
oklch(70.6% 0.142 30.5)
-
Step 500
500
#E25340
oklch(63.1% 0.182 30.4)
-
Step 600
600
#CD2F1C
oklch(55.6% 0.197 30.7)
-
Step 700
700 (this color)
#A81100
oklch(46.5% 0.183 30.7)
-
Step 800
800
#901E10
oklch(42.8% 0.152 30.8)
-
Step 900
900
#732116
oklch(37.7% 0.117 30.8)
-
Step 950
950
#44150E
oklch(27% 0.074 30.9)
#A81100 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) | #483F00 | 0.199 |
| Deuteranopia (no green cones) | #6C5F00 | 0.176 |
| Tritanopia (no blue cones) | #BA0011 | 0.038 |
| Achromatopsia (no color) | #535353 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A81100
#A81100
oklch(46.5% 0.183 30.7)
- #006573
#006573
oklch(46.5% 0.081 211.2)
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 #A81100, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Red #9F2305 ΔE 0.022
- Rufous #AE2012 ΔE 0.022
- Rust Red #AA2704 ΔE 0.024
- Carmine #9D0216 ΔE 0.032
- Brown #A52A2A ΔE 0.032
- Auburn #9B2226 ΔE 0.034
- Firebrick #B22222 ΔE 0.034
- Deep Red #9A0200 ΔE 0.035
Use #A81100 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.