#A51B10
Closest named color: Burnt Red (#9F2305). oklch(46.6% 0.174 29.8), rgb(165, 27, 16).
Aa
White text reads best on this color (7.59:1).
About this color
#A51B10 is a medium-dark, vivid red. In OKLCH its lightness is 47%, its chroma 0.174 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Burnt Red (#9F2305), ΔE 0.016 away. White text reads best on it, at 7.59:1.
| Hue family | Reds |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.174) |
| Temperature | warm |
| Nearest name | Burnt Red (#9F2305) |
| Black text | 2.76:1 |
| White text | 7.59:1 |
Values
| HEX | #A51B10 |
| RGB | rgb(165, 27, 16) |
| HSL | hsl(4, 82%, 35%) |
| OKLCH | oklch(46.6% 0.174 29.8) |
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 #A51B10 | 7.59:1 | AAA | Lc -89.6 | Fine for body text |
| Black text on #A51B10 | 2.76:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #A51B10 text on white | 7.59:1 | AAA | Lc 84.6 | Fine for body text |
| #A51B10 text on black | 2.76:1 | Fails | Lc -17.4 | 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
#F7CEC7
oklch(88.5% 0.048 29.4)
-
Step 300
300
#F2ADA1
oklch(81% 0.084 30)
-
Step 400
400
#E87E6E
oklch(70.7% 0.134 29.8)
-
Step 500
500
#DE5746
oklch(63.1% 0.172 29.8)
-
Step 600
600
#C93627
oklch(55.6% 0.186 29.9)
-
Step 700
700 (this color)
#A51B10
oklch(46.6% 0.174 29.8)
-
Step 800
800
#8D2218
oklch(42.7% 0.144 29.6)
-
Step 900
900
#71231A
oklch(37.6% 0.112 29.8)
-
Step 950
950
#431610
oklch(27% 0.071 30)
#A51B10 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) | #4A410B | 0.187 |
| Deuteranopia (no green cones) | #6B5E03 | 0.169 |
| Tritanopia (no blue cones) | #B6001B | 0.037 |
| Achromatopsia (no color) | #545454 | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A51B10
#A51B10
oklch(46.6% 0.174 29.8)
- #006672
#006672
oklch(46.7% 0.08 208.8)
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 #A51B10, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Red #9F2305 ΔE 0.016
- Rufous #AE2012 ΔE 0.021
- Rust Red #AA2704 ΔE 0.022
- Brown #A52A2A ΔE 0.024
- Auburn #9B2226 ΔE 0.025
- Carmine #9D0216 ΔE 0.030
- Firebrick #B22222 ΔE 0.033
- Deep Red #9A0200 ΔE 0.034
Use #A51B10 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.