#151B38
Closest named color: Rich Black (#0D1B2A). oklch(23.4% 0.056 272.5), rgb(21, 27, 56).
Aa
White text reads best on this color (16.85:1).
About this color
#151B38 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.056 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.031 away. White text reads best on it, at 16.85:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.85:1 |
Values
| HEX | #151B38 |
| RGB | rgb(21, 27, 56) |
| HSL | hsl(230, 45%, 15%) |
| OKLCH | oklch(23.4% 0.056 272.5) |
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 #151B38 | 16.85:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #151B38 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #151B38 text on white | 16.85:1 | AAA | Lc 103.7 | Preferred for body text |
| #151B38 text on black | 1.24:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F2
oklch(88.4% 0.037 272)
-
Step 300
300
#B2BFED
oklch(81% 0.067 272.5)
-
Step 400
400
#8A9CE3
oklch(70.7% 0.106 272.6)
-
Step 500
500
#6E82DB
oklch(63.1% 0.136 272.4)
-
Step 600
600
#576AC9
oklch(55.7% 0.148 272.3)
-
Step 700
700
#4857AE
oklch(49.1% 0.139 272.9)
-
Step 800
800
#3B488D
oklch(42.8% 0.114 272.7)
-
Step 900
900
#323D70
oklch(37.7% 0.088 272.4)
-
Step 950
950 (this color)
#151B38
oklch(23.4% 0.056 272.5)
#151B38 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) | #0E1F39 | 0.015 |
| Deuteranopia (no green cones) | #0A1C37 | 0.015 |
| Tritanopia (no blue cones) | #052126 | 0.050 |
| Achromatopsia (no color) | #1D1D1D | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151B38
#151B38
oklch(23.4% 0.056 272.5)
- #261D00
#261D00
oklch(23.5% 0.048 92.4)
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 #151B38, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.031
- Dark #1B2431 ΔE 0.039
- Oxford Blue #1B263B ΔE 0.039
- Navy Blue #001146 ΔE 0.053
- Jet #212529 ΔE 0.056
- Dark Indigo #1F0954 ΔE 0.068
- Midnight Purple #280137 ΔE 0.074
- Space Cadet #2B2D42 ΔE 0.074
Use #151B38 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.