#A21631
Closest named color: Rouge (#AB1239). oklch(46.1% 0.171 18.3), rgb(162, 22, 49).
Aa
White text reads best on this color (7.79:1).
About this color
#A21631 is a medium-dark, vivid red. In OKLCH its lightness is 46%, its chroma 0.171 and its hue 18°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.021 away. White text reads best on it, at 7.79:1.
| Hue family | Reds |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.171) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.69:1 |
| White text | 7.79:1 |
Values
| HEX | #A21631 |
| RGB | rgb(162, 22, 49) |
| HSL | hsl(348, 76%, 36%) |
| OKLCH | oklch(46.1% 0.171 18.3) |
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 #A21631 | 7.79:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #A21631 | 2.69:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #A21631 text on white | 7.79:1 | AAA | Lc 85.3 | Fine for body text |
| #A21631 text on black | 2.69:1 | Fails | Lc -16.8 | 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
#FAE4E4
oklch(93.7% 0.024 17.6)
-
Step 200
200
#F6CECD
oklch(88.5% 0.045 19.7)
-
Step 300
300
#F2ABAC
oklch(80.9% 0.084 18.1)
-
Step 400
400
#E77C81
oklch(70.7% 0.132 18.1)
-
Step 500
500
#DD5561
oklch(63.1% 0.17 18.2)
-
Step 600
600
#C83348
oklch(55.6% 0.184 18.1)
-
Step 700
700 (this color)
#A21631
oklch(46.1% 0.171 18.3)
-
Step 800
800
#8C2130
oklch(42.7% 0.142 18.1)
-
Step 900
900
#71222A
oklch(37.8% 0.111 18.5)
-
Step 950
950
#421519
oklch(26.9% 0.07 17.8)
#A21631 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) | #444031 | 0.190 |
| Deuteranopia (no green cones) | #665C2D | 0.173 |
| Tritanopia (no blue cones) | #B20023 | 0.034 |
| Achromatopsia (no color) | #525252 | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A21631
#A21631
oklch(46.1% 0.171 18.3)
- #006568
#006568
oklch(46% 0.078 198.4)
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 #A21631, closest first.
No curated palette has a color within ΔE 0.04 of #A21631.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.021
- Auburn #9B2226 ΔE 0.024
- Cranberry #9E003A ΔE 0.026
- Carmine #9D0216 ΔE 0.031
- Brown #A52A2A ΔE 0.031
- Deep Red #9A0200 ΔE 0.045
- Burnt Red #9F2305 ΔE 0.045
- Rufous #AE2012 ΔE 0.045
Use #A21631 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.