#AD1828
Closest named color: Firebrick (#B22222). oklch(48.2% 0.181 23.1), rgb(173, 24, 40).
Aa
White text reads best on this color (7.14:1).
About this color
#AD1828 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.181 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.019 away. White text reads best on it, at 7.14:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.181) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 2.93:1 |
| White text | 7.14:1 |
Values
| HEX | #AD1828 |
| RGB | rgb(173, 24, 40) |
| HSL | hsl(354, 76%, 39%) |
| OKLCH | oklch(48.2% 0.181 23.1) |
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 #AD1828 | 7.14:1 | AAA | Lc -88.0 | Fine for body text |
| Black text on #AD1828 | 2.93:1 | Fails | Lc 21.1 | Dividers and decoration only |
| #AD1828 text on white | 7.14:1 | AAA | Lc 82.9 | Fine for body text |
| #AD1828 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FBE4E2
oklch(93.7% 0.025 23.6)
-
Step 200
200
#F8CDCA
oklch(88.4% 0.049 22.8)
-
Step 300
300
#F4ABA6
oklch(81% 0.087 23.5)
-
Step 400
400
#EB7A77
oklch(70.7% 0.14 22.8)
-
Step 500
500
#E15254
oklch(63.1% 0.178 23)
-
Step 600
600
#CC2D38
oklch(55.5% 0.194 23.1)
-
Step 700
700 (this color)
#AD1828
oklch(48.2% 0.181 23.1)
-
Step 800
800
#8F1C24
oklch(42.6% 0.15 23.2)
-
Step 900
900
#732022
oklch(37.7% 0.116 23.4)
-
Step 950
950
#441414
oklch(27% 0.074 23.5)
#AD1828 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) | #4A4427 | 0.199 |
| Deuteranopia (no green cones) | #6E6322 | 0.182 |
| Tritanopia (no blue cones) | #BF0020 | 0.036 |
| Achromatopsia (no color) | #585858 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AD1828
#AD1828
oklch(48.2% 0.181 23.1)
- #006B73
#006B73
oklch(48.1% 0.082 203.8)
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 #AD1828, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.019
- Brown #A52A2A ΔE 0.022
- Rufous #AE2012 ΔE 0.023
- Rouge #AB1239 ΔE 0.024
- Rust Red #AA2704 ΔE 0.034
- Scarlet #BE0119 ΔE 0.035
- Auburn #9B2226 ΔE 0.037
- Lipstick Red #C0022F ΔE 0.039
Use #AD1828 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.