#A21818
Closest named color: Auburn (#9B2226). oklch(45.9% 0.172 27.4), rgb(162, 24, 24).
Aa
White text reads best on this color (7.83:1).
About this color
#A21818 is a medium-dark, vivid red. In OKLCH its lightness is 46%, its chroma 0.172 and its hue 27°. Its hue sits on the warm side of the wheel. The nearest named color is Auburn (#9B2226), ΔE 0.018 away. White text reads best on it, at 7.83:1.
| Hue family | Reds |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.172) |
| Temperature | warm |
| Nearest name | Auburn (#9B2226) |
| Black text | 2.68:1 |
| White text | 7.83:1 |
Values
| HEX | #A21818 |
| RGB | rgb(162, 24, 24) |
| HSL | hsl(0, 74%, 36%) |
| OKLCH | oklch(45.9% 0.172 27.4) |
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 #A21818 | 7.83:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #A21818 | 2.68:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #A21818 text on white | 7.83:1 | AAA | Lc 85.4 | Fine for body text |
| #A21818 text on black | 2.68:1 | Fails | Lc -16.6 | 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 800.
-
Step 50
50
#FEF2F0
oklch(97% 0.013 28.9)
-
Step 100
100
#FDE3DF
oklch(93.6% 0.029 28.1)
-
Step 200
200
#FCCCC5
oklch(88.5% 0.056 27.9)
-
Step 300
300
#FBA89D
oklch(81% 0.1 27.8)
-
Step 400
400
#F47367
oklch(70.6% 0.161 27.3)
-
Step 500
500
#EC443C
oklch(63.1% 0.206 27.5)
-
Step 600
600
#D70A17
oklch(55.5% 0.223 27.4)
-
Step 700
700
#B7000F
oklch(49% 0.2 27.4)
-
Step 800
800 (this color)
#A21818
oklch(45.9% 0.172 27.4)
-
Step 900
900
#791614
oklch(37.7% 0.134 27.3)
-
Step 950
950
#47100D
oklch(26.9% 0.084 27.4)
#A21818 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) | #473F16 | 0.187 |
| Deuteranopia (no green cones) | #685C0F | 0.169 |
| Tritanopia (no blue cones) | #B3001B | 0.035 |
| Achromatopsia (no color) | #525252 | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A21818
#A21818
oklch(45.9% 0.172 27.4)
- #00646E
#00646E
oklch(46% 0.079 206.7)
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 #A21818, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Auburn #9B2226 ΔE 0.018
- Burnt Red #9F2305 ΔE 0.019
- Carmine #9D0216 ΔE 0.021
- Brown #A52A2A ΔE 0.026
- Deep Red #9A0200 ΔE 0.028
- Rufous #AE2012 ΔE 0.030
- Rust Red #AA2704 ΔE 0.032
- Blood Red #980002 ΔE 0.032
Use #A21818 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.