#151C30
Closest named color: Rich Black (#0D1B2A). oklch(23% 0.04 268.5), rgb(21, 28, 48).
Aa
White text reads best on this color (16.92:1).
About this color
#151C30 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.040 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.018 away. White text reads best on it, at 16.92:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.92:1 |
Values
| HEX | #151C30 |
| RGB | rgb(21, 28, 48) |
| HSL | hsl(224, 39%, 14%) |
| OKLCH | oklch(23% 0.04 268.5) |
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 #151C30 | 16.92:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #151C30 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #151C30 text on white | 16.92:1 | AAA | Lc 103.8 | Preferred for body text |
| #151C30 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EB
oklch(88.5% 0.026 268.8)
-
Step 300
300
#B4C0E0
oklch(80.9% 0.047 269.1)
-
Step 400
400
#8C9FD1
oklch(70.6% 0.077 268.3)
-
Step 500
500
#7187C5
oklch(63.2% 0.097 268.6)
-
Step 600
600
#5970B1
oklch(55.6% 0.105 268.1)
-
Step 700
700
#495D99
oklch(49% 0.1 268.6)
-
Step 800
800
#3C4C7C
oklch(42.6% 0.083 268.8)
-
Step 900
900
#334064
oklch(37.7% 0.064 268.1)
-
Step 950
950 (this color)
#151C30
oklch(23% 0.04 268.5)
#151C30 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) | #151E31 | 0.007 |
| Deuteranopia (no green cones) | #121C30 | 0.005 |
| Tritanopia (no blue cones) | #0B2023 | 0.036 |
| Achromatopsia (no color) | #1D1D1D | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151C30
#151C30
oklch(23% 0.04 268.5)
- #251C04
#251C04
oklch(23.1% 0.041 88.9)
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 #151C30, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.018
- Dark #1B2431 ΔE 0.031
- Oxford Blue #1B263B ΔE 0.039
- Jet #212529 ΔE 0.045
- Navy Blue #001146 ΔE 0.065
- Rich Navy #001219 ΔE 0.068
- Space Cadet #2B2D42 ΔE 0.075
- Midnight Purple #280137 ΔE 0.081
Use #151C30 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.