#AD3531
Closest named color: Firebrick (#B22222). oklch(50.7% 0.157 26.3), rgb(173, 53, 49).
Aa
White text reads best on this color (6.30:1).
About this color
#AD3531 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.157 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.025 away. White text reads best on it, at 6.30:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.157) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.33:1 |
| White text | 6.30:1 |
Values
| HEX | #AD3531 |
| RGB | rgb(173, 53, 49) |
| HSL | hsl(2, 56%, 44%) |
| OKLCH | oklch(50.7% 0.157 26.3) |
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 #AD3531 | 6.30:1 | AA | Lc -85.5 | Fine for body text |
| Black text on #AD3531 | 3.33:1 | AA large text | Lc 23.7 | Dividers and decoration only |
| #AD3531 text on white | 6.30:1 | AA | Lc 80.3 | Fine for body text |
| #AD3531 text on black | 3.33:1 | AA large text | Lc -21.5 | 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 700.
-
Step 50
50
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F8E5E2
oklch(93.6% 0.021 28.3)
-
Step 200
200
#F4CFCB
oklch(88.5% 0.042 25.3)
-
Step 300
300
#EEAEA7
oklch(80.9% 0.076 25.9)
-
Step 400
400
#E28178
oklch(70.6% 0.121 26.2)
-
Step 500
500
#D75D55
oklch(63% 0.155 26.2)
-
Step 600
600
#C33F3A
oklch(55.7% 0.169 26.4)
-
Step 700
700 (this color)
#AD3531
oklch(50.7% 0.157 26.3)
-
Step 800
800
#882926
oklch(42.7% 0.13 26.1)
-
Step 900
900
#6E2723
oklch(37.8% 0.102 26.3)
-
Step 950
950
#401815
oklch(26.9% 0.063 26.5)
#AD3531 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) | #574F2F | 0.167 |
| Deuteranopia (no green cones) | #75692D | 0.153 |
| Tritanopia (no blue cones) | #BE0F35 | 0.048 |
| Achromatopsia (no color) | #606060 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AD3531
#AD3531
oklch(50.7% 0.157 26.3)
- #00737E
#00737E
oklch(50.7% 0.087 206.4)
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 #AD3531, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.025
- Brown #A52A2A ΔE 0.027
- Rusty Red #AF2F0D ΔE 0.027
- Brick #A03623 ΔE 0.031
- Rufous #AE2012 ΔE 0.032
- Rust Red #AA2704 ΔE 0.035
- Dull Red #BB3F3F ΔE 0.038
- Russet #A13905 ΔE 0.044
Use #AD3531 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.