#A21830
Closest named color: Rouge (#AB1239). oklch(46.2% 0.17 19), rgb(162, 24, 48).
Aa
White text reads best on this color (7.75:1).
About this color
#A21830 is a medium-dark, vivid red. In OKLCH its lightness is 46%, its chroma 0.170 and its hue 19°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.022 away. White text reads best on it, at 7.75:1.
| Hue family | Reds |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.170) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.70:1 |
| White text | 7.75:1 |
Values
| HEX | #A21830 |
| RGB | rgb(162, 24, 48) |
| HSL | hsl(350, 74%, 36%) |
| OKLCH | oklch(46.2% 0.17 19) |
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 #A21830 | 7.75:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #A21830 | 2.70:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #A21830 text on white | 7.75:1 | AAA | Lc 85.2 | Fine for body text |
| #A21830 text on black | 2.70:1 | 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
#FAE4E3
oklch(93.6% 0.024 20.7)
-
Step 200
200
#F6CECD
oklch(88.5% 0.045 19.7)
-
Step 300
300
#F1ACAC
oklch(81% 0.081 19)
-
Step 400
400
#E77C80
oklch(70.7% 0.132 18.6)
-
Step 500
500
#DC5660
oklch(63.1% 0.168 18.9)
-
Step 600
600
#C83446
oklch(55.6% 0.184 19.1)
-
Step 700
700 (this color)
#A21830
oklch(46.2% 0.17 19)
-
Step 800
800
#8C212F
oklch(42.7% 0.142 18.7)
-
Step 900
900
#702229
oklch(37.6% 0.11 19.1)
-
Step 950
950
#421518
oklch(26.9% 0.07 19.2)
#A21830 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) | #444030 | 0.190 |
| Deuteranopia (no green cones) | #665D2C | 0.173 |
| Tritanopia (no blue cones) | #B20023 | 0.034 |
| Achromatopsia (no color) | #535353 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A21830
#A21830
oklch(46.2% 0.17 19)
- #006569
#006569
oklch(46% 0.078 199.6)
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 #A21830, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.022
- Auburn #9B2226 ΔE 0.022
- Brown #A52A2A ΔE 0.029
- Cranberry #9E003A ΔE 0.029
- Carmine #9D0216 ΔE 0.030
- Burnt Red #9F2305 ΔE 0.042
- Rufous #AE2012 ΔE 0.043
- Firebrick #B22222 ΔE 0.043
Use #A21830 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.