#AC3707
Closest named color: Rusty Red (#AF2F0D). oklch(50.4% 0.161 38.1), rgb(172, 55, 7).
Aa
White text reads best on this color (6.35:1).
About this color
#AC3707 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.161 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.014 away. White text reads best on it, at 6.35:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.161) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.30:1 |
| White text | 6.35:1 |
Values
| HEX | #AC3707 |
| RGB | rgb(172, 55, 7) |
| HSL | hsl(17, 92%, 35%) |
| OKLCH | oklch(50.4% 0.161 38.1) |
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 #AC3707 | 6.35:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #AC3707 | 3.30:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #AC3707 text on white | 6.35:1 | AA | Lc 80.5 | Fine for body text |
| #AC3707 text on black | 3.30:1 | AA large text | Lc -21.3 | 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
#F4D0C5
oklch(88.5% 0.043 37.7)
-
Step 300
300
#EEB09C
oklch(81% 0.078 38.6)
-
Step 400
400
#E28366
oklch(70.6% 0.125 37.8)
-
Step 500
500
#D7603A
oklch(63.1% 0.159 38)
-
Step 600
600
#C34211
oklch(55.6% 0.173 38)
-
Step 700
700 (this color)
#AC3707
oklch(50.4% 0.161 38.1)
-
Step 800
800
#882C08
oklch(42.8% 0.133 38.4)
-
Step 900
900
#6D2912
oklch(37.6% 0.103 38.4)
-
Step 950
950
#40190C
oklch(26.9% 0.065 38.7)
#AC3707 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) | #5A4F00 | 0.163 |
| Deuteranopia (no green cones) | #776900 | 0.146 |
| Tritanopia (no blue cones) | #BE0C30 | 0.068 |
| Achromatopsia (no color) | #5F5F5F | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC3707
#AC3707
oklch(50.4% 0.161 38.1)
- #007087
#007087
oklch(50.4% 0.091 218.6)
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 #AC3707, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.014
- Russet #A13905 ΔE 0.022
- Rust Red #AA2704 ΔE 0.026
- Brick #A03623 ΔE 0.030
- Burnt Umber #A0450E ΔE 0.032
- Rufous #AE2012 ΔE 0.035
- Sinopia #BB3E03 ΔE 0.035
- Firebrick #B22222 ΔE 0.039
Use #AC3707 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.