#AD311F
Closest named color: Rusty Red (#AF2F0D). oklch(50.1% 0.163 31.3), rgb(173, 49, 31).
Aa
White text reads best on this color (6.48:1).
About this color
#AD311F is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.163 and its hue 31°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.011 away. White text reads best on it, at 6.48:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.163) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.23:1 |
| White text | 6.48:1 |
Values
| HEX | #AD311F |
| RGB | rgb(173, 49, 31) |
| HSL | hsl(8, 70%, 40%) |
| OKLCH | oklch(50.1% 0.163 31.3) |
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 #AD311F | 6.48:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #AD311F | 3.23:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #AD311F text on white | 6.48:1 | AA | Lc 81.0 | Fine for body text |
| #AD311F text on black | 3.23:1 | AA large text | Lc -20.9 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F9E5E1
oklch(93.7% 0.023 31.1)
-
Step 200
200
#F5CFC8
oklch(88.5% 0.044 30.2)
-
Step 300
300
#EFAEA1
oklch(80.8% 0.079 31.6)
-
Step 400
400
#E4816F
oklch(70.7% 0.126 31.3)
-
Step 500
500
#DA5C48
oklch(63.1% 0.163 31.1)
-
Step 600
600
#C53D29
oklch(55.6% 0.176 31.3)
-
Step 700
700 (this color)
#AD311F
oklch(50.1% 0.163 31.3)
-
Step 800
800
#8A2819
oklch(42.8% 0.135 31.5)
-
Step 900
900
#6F261B
oklch(37.7% 0.106 31.1)
-
Step 950
950
#411811
oklch(27% 0.066 31.5)
#AD311F 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) | #564D1C | 0.172 |
| Deuteranopia (no green cones) | #756819 | 0.156 |
| Tritanopia (no blue cones) | #BF002E | 0.054 |
| Achromatopsia (no color) | #5E5E5E | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AD311F
#AD311F
oklch(50.1% 0.163 31.3)
- #007080
#007080
oklch(50% 0.087 211.9)
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 #AD311F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.011
- Rust Red #AA2704 ΔE 0.020
- Rufous #AE2012 ΔE 0.021
- Firebrick #B22222 ΔE 0.021
- Brick #A03623 ΔE 0.025
- Brown #A52A2A ΔE 0.026
- Russet #A13905 ΔE 0.033
- Burnt Red #9F2305 ΔE 0.041
Use #AD311F 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.