#A21509
Closest named color: Burnt Red (#9F2305). oklch(45.6% 0.175 30), rgb(162, 21, 9).
Aa
White text reads best on this color (7.93:1).
About this color
#A21509 is a medium-dark, vivid red. In OKLCH its lightness is 46%, its chroma 0.175 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 7.93:1.
| Hue family | Reds |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.175) |
| Temperature | warm |
| Nearest name | Burnt Red (#9F2305) |
| Black text | 2.64:1 |
| White text | 7.93:1 |
Values
| HEX | #A21509 |
| RGB | rgb(162, 21, 9) |
| HSL | hsl(5, 89%, 34%) |
| OKLCH | oklch(45.6% 0.175 30) |
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 #A21509 | 7.93:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #A21509 | 2.64:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #A21509 text on white | 7.93:1 | AAA | Lc 85.6 | Fine for body text |
| #A21509 text on black | 2.64:1 | Fails | Lc -16.5 | 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
#FFF2F0
oklch(97.1% 0.014 28)
-
Step 100
100
#FDE3DE
oklch(93.6% 0.03 30.6)
-
Step 200
200
#FDCCC3
oklch(88.5% 0.057 30.3)
-
Step 300
300
#FCA899
oklch(81% 0.102 30.6)
-
Step 400
400
#F57361
oklch(70.6% 0.163 29.8)
-
Step 500
500
#ED4331
oklch(63% 0.209 30)
-
Step 600
600
#D71000
oklch(55.6% 0.223 30)
-
Step 700
700
#B60B00
oklch(49.1% 0.197 30)
-
Step 800
800 (this color)
#A21509
oklch(45.6% 0.175 30)
-
Step 900
900
#7A150C
oklch(37.7% 0.137 29.9)
-
Step 950
950
#481009
oklch(27.1% 0.086 30.5)
#A21509 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) | #473E04 | 0.189 |
| Deuteranopia (no green cones) | #685C00 | 0.171 |
| Tritanopia (no blue cones) | #B30015 | 0.036 |
| Achromatopsia (no color) | #515151 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A21509
#A21509
oklch(45.6% 0.175 30)
- #00626F
#00626F
oklch(45.5% 0.079 210.5)
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 #A21509, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Red #9F2305 ΔE 0.016
- Carmine #9D0216 ΔE 0.022
- Auburn #9B2226 ΔE 0.024
- Deep Red #9A0200 ΔE 0.024
- Blood Red #980002 ΔE 0.029
- Rust Red #AA2704 ΔE 0.031
- Rufous #AE2012 ΔE 0.031
- Brown #A52A2A ΔE 0.032
Use #A21509 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.