#851903
Closest named color: Dark Red (#8B0000). oklch(40.2% 0.146 32.8), rgb(133, 25, 3).
Aa
White text reads best on this color (9.82:1).
About this color
#851903 is a dark, vivid red. In OKLCH its lightness is 40%, its chroma 0.146 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Dark Red (#8B0000), ΔE 0.021 away. White text reads best on it, at 9.82:1.
| Hue family | Reds |
| Lightness | dark (40%) |
| Chroma | vivid (0.146) |
| Temperature | warm |
| Nearest name | Dark Red (#8B0000) |
| Black text | 2.13:1 |
| White text | 9.82:1 |
Values
| HEX | #851903 |
| RGB | rgb(133, 25, 3) |
| HSL | hsl(10, 96%, 27%) |
| OKLCH | oklch(40.2% 0.146 32.8) |
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 #851903 | 9.82:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #851903 | 2.13:1 | Fails | Lc 12.7 | Not readable |
| #851903 text on white | 9.82:1 | AAA | Lc 91.3 | Preferred for body text |
| #851903 text on black | 2.13:1 | Fails | Lc -11.1 | Not readable |
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 900.
-
Step 50
50
#FFF2EF
oklch(97.1% 0.015 33.1)
-
Step 100
100
#FEE3DD
oklch(93.6% 0.031 32.6)
-
Step 200
200
#FFCBC0
oklch(88.5% 0.061 32.1)
-
Step 300
300
#FFA693
oklch(80.9% 0.11 32.7)
-
Step 400
400
#FA7055
oklch(70.7% 0.175 32.8)
-
Step 500
500
#F23B15
oklch(63% 0.223 32.8)
-
Step 600
600
#D02900
oklch(55.5% 0.206 32.8)
-
Step 700
700
#B02100
oklch(49% 0.182 32.8)
-
Step 800
800
#921900
oklch(42.7% 0.159 32.7)
-
Step 900
900 (this color)
#851903
oklch(40.2% 0.146 32.8)
-
Step 950
950
#4A0D03
oklch(27% 0.093 33)
#851903 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) | #3C3400 | 0.156 |
| Deuteranopia (no green cones) | #574C00 | 0.138 |
| Tritanopia (no blue cones) | #930016 | 0.037 |
| Achromatopsia (no color) | #434343 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #851903
#851903
oklch(40.2% 0.146 32.8)
- #00525E
#00525E
oklch(40.2% 0.07 211.6)
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 #851903, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Red #8B0000 ΔE 0.021
- Brick Red #8F1402 ΔE 0.021
- Maroon #800000 ΔE 0.028
- Red Brown #8B2E16 ΔE 0.038
- Chestnut #742802 ΔE 0.039
- Blood Red #980002 ΔE 0.040
- Deep Red #9A0200 ΔE 0.044
- Brown Red #922B05 ΔE 0.044
Use #851903 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.