#900304
Closest named color: Dark Red (#8B0000). oklch(41.2% 0.167 28.8), rgb(144, 3, 4).
Aa
White text reads best on this color (9.54:1).
About this color
#900304 is a dark, vivid red. In OKLCH its lightness is 41%, its chroma 0.167 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Dark Red (#8B0000), ΔE 0.012 away. White text reads best on it, at 9.54:1.
| Hue family | Reds |
| Lightness | dark (41%) |
| Chroma | vivid (0.167) |
| Temperature | warm |
| Nearest name | Dark Red (#8B0000) |
| Black text | 2.20:1 |
| White text | 9.54:1 |
Values
| HEX | #900304 |
| RGB | rgb(144, 3, 4) |
| HSL | hsl(360, 96%, 29%) |
| OKLCH | oklch(41.2% 0.167 28.8) |
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 #900304 | 9.54:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #900304 | 2.20:1 | Fails | Lc 14.3 | Not readable |
| #900304 text on white | 9.54:1 | AAA | Lc 89.7 | Fine for body text |
| #900304 text on black | 2.20:1 | Fails | Lc -12.5 | 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 800.
-
Step 50
50
#FEF2F0
oklch(97% 0.013 28.9)
-
Step 100
100
#FCE3DF
oklch(93.5% 0.028 28.5)
-
Step 200
200
#FBCCC5
oklch(88.4% 0.054 28.1)
-
Step 300
300
#F9A99D
oklch(80.9% 0.097 28.8)
-
Step 400
400
#F27666
oklch(70.7% 0.156 29.1)
-
Step 500
500
#E9493B
oklch(63.1% 0.199 28.9)
-
Step 600
600
#D51915
oklch(55.6% 0.217 28.7)
-
Step 700
700
#B80004
oklch(49.2% 0.201 28.8)
-
Step 800
800 (this color)
#900304
oklch(41.2% 0.167 28.8)
-
Step 900
900
#781913
oklch(37.7% 0.131 28.7)
-
Step 950
950
#47110D
oklch(27% 0.083 28.2)
#900304 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) | #3B3300 | 0.183 |
| Deuteranopia (no green cones) | #5A4F00 | 0.162 |
| Tritanopia (no blue cones) | #A00008 | 0.035 |
| Achromatopsia (no color) | #454545 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #900304
#900304
oklch(41.2% 0.167 28.8)
- #00555F
#00555F
oklch(41.1% 0.071 208.5)
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 #900304, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Red #8B0000 ΔE 0.012
- Brick Red #8F1402 ΔE 0.013
- Blood Red #980002 ΔE 0.017
- Deep Red #9A0200 ΔE 0.022
- Carmine #9D0216 ΔE 0.031
- Maroon #800000 ΔE 0.037
- Brown Red #922B05 ΔE 0.045
- Auburn #9B2226 ΔE 0.045
Use #900304 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.