#900D57
Closest named color: Mulberry (#920A4E). oklch(43.3% 0.17 353.9), rgb(144, 13, 87).
Aa
White text reads best on this color (8.81:1).
About this color
#900D57 is a dark, vivid red. In OKLCH its lightness is 43%, its chroma 0.170 and its hue 354°. Its hue sits on the warm side of the wheel. The nearest named color is Mulberry (#920A4E), ΔE 0.016 away. White text reads best on it, at 8.81:1.
| Hue family | Reds |
| Lightness | dark (43%) |
| Chroma | vivid (0.170) |
| Temperature | warm |
| Nearest name | Mulberry (#920A4E) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #900D57 |
| RGB | rgb(144, 13, 87) |
| HSL | hsl(326, 83%, 31%) |
| OKLCH | oklch(43.3% 0.17 353.9) |
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 #900D57 | 8.81:1 | AAA | Lc -93.0 | Preferred for body text |
| Black text on #900D57 | 2.38:1 | Fails | Lc 15.6 | Dividers and decoration only |
| #900D57 text on white | 8.81:1 | AAA | Lc 88.4 | Fine for body text |
| #900D57 text on black | 2.38:1 | Fails | Lc -13.8 | 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
#FDF2F6
oklch(97.1% 0.013 353.1)
-
Step 100
100
#FBE2EB
oklch(93.6% 0.03 353.9)
-
Step 200
200
#F8CBDC
oklch(88.6% 0.055 353.6)
-
Step 300
300
#F4A6C5
oklch(80.9% 0.099 354)
-
Step 400
400
#EA72A7
oklch(70.7% 0.158 354.1)
-
Step 500
500
#E04492
oklch(63.1% 0.204 353.9)
-
Step 600
600
#CB137C
oklch(55.6% 0.221 354)
-
Step 700
700
#AE0069
oklch(49.1% 0.203 353.8)
-
Step 800
800 (this color)
#900D57
oklch(43.3% 0.17 353.9)
-
Step 900
900
#721746
oklch(37.7% 0.132 354.1)
-
Step 950
950
#431029
oklch(26.9% 0.083 354)
#900D57 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) | #2E3C59 | 0.194 |
| Deuteranopia (no green cones) | #525254 | 0.169 |
| Tritanopia (no blue cones) | #9C0033 | 0.062 |
| Achromatopsia (no color) | #4A4A4A | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #900D57
#900D57
oklch(43.3% 0.17 353.9)
- #005F4D
#005F4D
oklch(43.3% 0.082 173.9)
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 #900D57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mulberry #920A4E ΔE 0.016
- Dark Fuchsia #9D0759 ΔE 0.027
- Berry #990F4B ΔE 0.030
- Purple Red #990147 ΔE 0.032
- Deep Magenta #A0025C ΔE 0.034
- Red Violet #9E0168 ΔE 0.039
- Red Purple #820747 ΔE 0.039
- Violet Red #A50055 ΔE 0.044
Use #900D57 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.