#151D38
Closest named color: Rich Black (#0D1B2A). oklch(23.9% 0.053 269.6), rgb(21, 29, 56).
Aa
White text reads best on this color (16.60:1).
About this color
#151D38 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.053 and its hue 270°. 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 16.60:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.26:1 |
| White text | 16.60:1 |
Values
| HEX | #151D38 |
| RGB | rgb(21, 29, 56) |
| HSL | hsl(226, 45%, 15%) |
| OKLCH | oklch(23.9% 0.053 269.6) |
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 #151D38 | 16.60:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #151D38 | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #151D38 text on white | 16.60:1 | AAA | Lc 103.5 | Preferred for body text |
| #151D38 text on black | 1.26:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#D0D9F1
oklch(88.6% 0.034 269.3)
-
Step 300
300
#B0BFEA
oklch(80.8% 0.063 269.9)
-
Step 400
400
#889EE0
oklch(70.8% 0.1 269.6)
-
Step 500
500
#6B84D7
oklch(63.1% 0.128 269.8)
-
Step 600
600
#536CC4
oklch(55.5% 0.139 269.5)
-
Step 700
700
#445AAA
oklch(49.2% 0.13 269.6)
-
Step 800
800
#384A89
oklch(42.7% 0.107 269.5)
-
Step 900
900
#303E6E
oklch(37.7% 0.084 269.8)
-
Step 950
950 (this color)
#151D38
oklch(23.9% 0.053 269.6)
#151D38 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) | #122039 | 0.010 |
| Deuteranopia (no green cones) | #0E1D37 | 0.010 |
| Tritanopia (no blue cones) | #052327 | 0.048 |
| Achromatopsia (no color) | #1E1E1E | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151D38
#151D38
oklch(23.9% 0.053 269.6)
- #281D00
#281D00
oklch(23.8% 0.049 88.6)
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 #151D38, 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 0.033
- Oxford Blue #1B263B ΔE 0.033
- Jet #212529 ΔE 0.050
- Navy Blue #001146 ΔE 0.057
- Space Cadet #2B2D42 ΔE 0.068
- Dark Indigo #1F0954 ΔE 0.072
- Midnight Purple #280137 ΔE 0.079
Use #151D38 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.