#251B59
Closest named color: Dark Indigo (#1F0954). oklch(27.7% 0.106 284.4), rgb(37, 27, 89).
Aa
White text reads best on this color (15.22:1).
About this color
#251B59 is a dark, moderately saturated purple. In OKLCH its lightness is 28%, its chroma 0.106 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.041 away. White text reads best on it, at 15.22:1.
| Hue family | Purples |
| Lightness | dark (28%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.37:1 |
| White text | 15.22:1 |
Values
| HEX | #251B59 |
| RGB | rgb(37, 27, 89) |
| HSL | hsl(250, 53%, 23%) |
| OKLCH | oklch(27.7% 0.106 284.4) |
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 #251B59 | 15.22:1 | AAA | Lc -104.6 | Preferred for body text |
| Black text on #251B59 | 1.37:1 | Fails | Lc 0.0 | Not readable |
| #251B59 text on white | 15.22:1 | AAA | Lc 101.8 | Preferred for body text |
| #251B59 text on black | 1.37:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E7E7FF
oklch(93.5% 0.032 285.8)
-
Step 200
200
#D4D5FF
oklch(88.6% 0.058 284.1)
-
Step 300
300
#B9B8FF
oklch(80.9% 0.1 284.6)
-
Step 400
400
#9790FF
oklch(70.8% 0.159 284.4)
-
Step 500
500
#806EFF
oklch(63% 0.207 284.4)
-
Step 600
600
#6E45FF
oklch(55.7% 0.256 284.5)
-
Step 700
700
#5E26EA
oklch(49.1% 0.261 284.4)
-
Step 800
800
#4C25BD
oklch(42.8% 0.215 284.4)
-
Step 900
900
#3E2795
oklch(37.7% 0.168 284.5)
-
Step 950
950 (this color)
#251B59
oklch(27.7% 0.106 284.4)
#251B59 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) | #00275B | 0.049 |
| Deuteranopia (no green cones) | #002458 | 0.048 |
| Tritanopia (no blue cones) | #0E2A37 | 0.088 |
| Achromatopsia (no color) | #262626 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #251B59
#251B59
oklch(27.7% 0.106 284.4)
- #2D2900
#2D2900
oklch(27.7% 0.058 103.9)
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 #251B59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.041
- Midnight Blue #191970 ΔE 0.046
- Marine #042E60 ΔE 0.059
- Oxford Blue #1B263B ΔE 0.069
- Darkblue #030764 ΔE 0.072
- Dark Purple #35063E ΔE 0.073
- Space Cadet #2B2D42 ΔE 0.074
- Prussian Blue #1D3557 ΔE 0.075
Use #251B59 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.