#AC3633
Closest named color: Brown (#A52A2A). oklch(50.7% 0.155 25.8), rgb(172, 54, 51).
Aa
White text reads best on this color (6.30:1).
About this color
#AC3633 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.155 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Brown (#A52A2A), ΔE 0.027 away. White text reads best on it, at 6.30:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.155) |
| Temperature | warm |
| Nearest name | Brown (#A52A2A) |
| Black text | 3.32:1 |
| White text | 6.30:1 |
Values
| HEX | #AC3633 |
| RGB | rgb(172, 54, 51) |
| HSL | hsl(1, 54%, 44%) |
| OKLCH | oklch(50.7% 0.155 25.8) |
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 #AC3633 | 6.30:1 | AA | Lc -85.5 | Fine for body text |
| Black text on #AC3633 | 3.32:1 | AA large text | Lc 23.7 | Dividers and decoration only |
| #AC3633 text on white | 6.30:1 | AA | Lc 80.4 | Fine for body text |
| #AC3633 text on black | 3.32:1 | 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
#EDAEA8
oklch(80.8% 0.075 25)
-
Step 400
400
#E18279
oklch(70.7% 0.119 26.2)
-
Step 500
500
#D65E57
oklch(63.1% 0.153 25.7)
-
Step 600
600
#C2403C
oklch(55.7% 0.167 25.9)
-
Step 700
700 (this color)
#AC3633
oklch(50.7% 0.155 25.8)
-
Step 800
800
#872A27
oklch(42.6% 0.128 26)
-
Step 900
900
#6D2824
oklch(37.8% 0.099 26.2)
-
Step 950
950
#401816
oklch(27% 0.063 25.1)
#AC3633 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) | #575032 | 0.165 |
| Deuteranopia (no green cones) | #74692F | 0.152 |
| Tritanopia (no blue cones) | #BD1436 | 0.047 |
| Achromatopsia (no color) | #606060 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC3633
#AC3633
oklch(50.7% 0.155 25.8)
- #00737D
#00737D
oklch(50.7% 0.087 205.4)
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 #AC3633, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown #A52A2A ΔE 0.027
- Firebrick #B22222 ΔE 0.027
- Rusty Red #AF2F0D ΔE 0.029
- Brick #A03623 ΔE 0.030
- Rufous #AE2012 ΔE 0.034
- Rust Red #AA2704 ΔE 0.037
- Dull Red #BB3F3F ΔE 0.038
- Russet #A13905 ΔE 0.044
Use #AC3633 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.