#AD1B00
Closest named color: Rufous (#AE2012). oklch(48% 0.183 31.9), rgb(173, 27, 0).
Aa
White text reads best on this color (7.15:1).
About this color
#AD1B00 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.183 and its hue 32°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.009 away. White text reads best on it, at 7.15:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.183) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 2.93:1 |
| White text | 7.15:1 |
Values
| HEX | #AD1B00 |
| RGB | rgb(173, 27, 0) |
| HSL | hsl(9, 100%, 34%) |
| OKLCH | oklch(48% 0.183 31.9) |
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 #AD1B00 | 7.15:1 | AAA | Lc -88.0 | Fine for body text |
| Black text on #AD1B00 | 2.93:1 | Fails | Lc 21.1 | Dividers and decoration only |
| #AD1B00 text on white | 7.15:1 | AAA | Lc 82.9 | Fine for body text |
| #AD1B00 text on black | 2.93:1 | Fails | Lc -19.0 | 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
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FBE4DF
oklch(93.6% 0.026 32.2)
-
Step 200
200
#F8CEC5
oklch(88.5% 0.049 32.1)
-
Step 300
300
#F4AC9D
oklch(80.9% 0.088 32.1)
-
Step 400
400
#EB7C67
oklch(70.7% 0.141 32)
-
Step 500
500
#E1543C
oklch(63% 0.18 32)
-
Step 600
600
#CD3017
oklch(55.6% 0.197 31.8)
-
Step 700
700 (this color)
#AD1B00
oklch(48% 0.183 31.9)
-
Step 800
800
#8F1F0C
oklch(42.7% 0.15 32)
-
Step 900
900
#732114
oklch(37.6% 0.117 31.7)
-
Step 950
950
#44150D
oklch(27% 0.075 31.9)
#AD1B00 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) | #4D4300 | 0.196 |
| Deuteranopia (no green cones) | #706300 | 0.174 |
| Tritanopia (no blue cones) | #BF0019 | 0.040 |
| Achromatopsia (no color) | #585858 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AD1B00
#AD1B00
oklch(48% 0.183 31.9)
- #006A79
#006A79
oklch(48.1% 0.084 211.6)
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 #AD1B00, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.009
- Rust Red #AA2704 ΔE 0.013
- Firebrick #B22222 ΔE 0.023
- Rusty Red #AF2F0D ΔE 0.026
- Burnt Red #9F2305 ΔE 0.028
- Brown #A52A2A ΔE 0.030
- Brick #A03623 ΔE 0.038
- Scarlet #BE0119 ΔE 0.039
Use #AD1B00 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.