#A51825
Closest named color: Auburn (#9B2226). oklch(46.6% 0.174 23.6), rgb(165, 24, 37).
Aa
White text reads best on this color (7.61:1).
About this color
#A51825 is a medium-dark, vivid red. In OKLCH its lightness is 47%, its chroma 0.174 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Auburn (#9B2226), ΔE 0.021 away. White text reads best on it, at 7.61:1.
| Hue family | Reds |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.174) |
| Temperature | warm |
| Nearest name | Auburn (#9B2226) |
| Black text | 2.75:1 |
| White text | 7.61:1 |
Values
| HEX | #A51825 |
| RGB | rgb(165, 24, 37) |
| HSL | hsl(354, 75%, 37%) |
| OKLCH | oklch(46.6% 0.174 23.6) |
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 #A51825 | 7.61:1 | AAA | Lc -89.6 | Fine for body text |
| Black text on #A51825 | 2.75:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #A51825 text on white | 7.61:1 | AAA | Lc 84.7 | Fine for body text |
| #A51825 text on black | 2.75:1 | Fails | Lc -17.3 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FAE4E2
oklch(93.6% 0.024 23.9)
-
Step 200
200
#F7CECA
oklch(88.5% 0.047 24.6)
-
Step 300
300
#F2ACA7
oklch(80.9% 0.083 23.6)
-
Step 400
400
#E87C78
oklch(70.6% 0.134 23.3)
-
Step 500
500
#DE5555
oklch(63% 0.172 23.4)
-
Step 600
600
#C9333A
oklch(55.5% 0.186 23.5)
-
Step 700
700 (this color)
#A51825
oklch(46.6% 0.174 23.6)
-
Step 800
800
#8D2125
oklch(42.7% 0.143 23.9)
-
Step 900
900
#712223
oklch(37.6% 0.111 23.5)
-
Step 950
950
#431515
oklch(27% 0.072 23.2)
#A51825 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) | #474124 | 0.191 |
| Deuteranopia (no green cones) | #695E1F | 0.174 |
| Tritanopia (no blue cones) | #B6001F | 0.034 |
| Achromatopsia (no color) | #545454 | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A51825
#A51825
oklch(46.6% 0.174 23.6)
- #00666E
#00666E
oklch(46.5% 0.079 204.2)
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 #A51825, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Auburn #9B2226 ΔE 0.021
- Brown #A52A2A ΔE 0.021
- Carmine #9D0216 ΔE 0.028
- Rouge #AB1239 ΔE 0.028
- Rufous #AE2012 ΔE 0.029
- Burnt Red #9F2305 ΔE 0.031
- Firebrick #B22222 ΔE 0.033
- Rust Red #AA2704 ΔE 0.036
Use #A51825 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.