#AC3909
Closest named color: Rusty Red (#AF2F0D). oklch(50.7% 0.159 38.6), rgb(172, 57, 9).
Aa
White text reads best on this color (6.28:1).
About this color
#AC3909 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.159 and its hue 39°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.017 away. White text reads best on it, at 6.28:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.159) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.34:1 |
| White text | 6.28:1 |
Values
| HEX | #AC3909 |
| RGB | rgb(172, 57, 9) |
| HSL | hsl(18, 90%, 35%) |
| OKLCH | oklch(50.7% 0.159 38.6) |
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 #AC3909 | 6.28:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #AC3909 | 3.34:1 | AA large text | Lc 23.8 | Dividers and decoration only |
| #AC3909 text on white | 6.28:1 | AA | Lc 80.2 | Fine for body text |
| #AC3909 text on black | 3.34:1 | AA large text | Lc -21.6 | 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 700.
-
Step 50
50
#FCF3F0
oklch(97% 0.011 39.4)
-
Step 100
100
#F8E5DF
oklch(93.5% 0.022 38.3)
-
Step 200
200
#F3D0C5
oklch(88.4% 0.042 38.2)
-
Step 300
300
#EDB09D
oklch(80.9% 0.077 38)
-
Step 400
400
#E18466
oklch(70.7% 0.123 38.6)
-
Step 500
500
#D6613A
oklch(63% 0.157 38.6)
-
Step 600
600
#C24412
oklch(55.7% 0.171 38.7)
-
Step 700
700 (this color)
#AC3909
oklch(50.7% 0.159 38.6)
-
Step 800
800
#872C08
oklch(42.6% 0.131 38.5)
-
Step 900
900
#6D2912
oklch(37.6% 0.103 38.4)
-
Step 950
950
#40190C
oklch(26.9% 0.065 38.7)
#AC3909 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) | #5B5000 | 0.160 |
| Deuteranopia (no green cones) | #776A00 | 0.146 |
| Tritanopia (no blue cones) | #BE1231 | 0.068 |
| Achromatopsia (no color) | #606060 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC3909
#AC3909
oklch(50.7% 0.159 38.6)
- #007188
#007188
oklch(50.7% 0.091 218.5)
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 #AC3909, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.017
- Russet #A13905 ΔE 0.023
- Rust Red #AA2704 ΔE 0.029
- Burnt Umber #A0450E ΔE 0.030
- Brick #A03623 ΔE 0.031
- Sinopia #BB3E03 ΔE 0.033
- Rufous #AE2012 ΔE 0.038
- Firebrick #B22222 ΔE 0.042
Use #AC3909 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.