#151E31
Closest named color: Rich Black (#0D1B2A). oklch(23.7% 0.039 264.3), rgb(21, 30, 49).
Aa
White text reads best on this color (16.64:1).
About this color
#151E31 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.039 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.021 away. White text reads best on it, at 16.64:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.26:1 |
| White text | 16.64:1 |
Values
| HEX | #151E31 |
| RGB | rgb(21, 30, 49) |
| HSL | hsl(221, 40%, 14%) |
| OKLCH | oklch(23.7% 0.039 264.3) |
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 #151E31 | 16.64:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #151E31 | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #151E31 text on white | 16.64:1 | AAA | Lc 103.5 | Preferred for body text |
| #151E31 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D1D9EB
oklch(88.5% 0.026 266.6)
-
Step 300
300
#B2C1DF
oklch(80.9% 0.046 264.3)
-
Step 400
400
#89A0D0
oklch(70.6% 0.075 264.7)
-
Step 500
500
#6C88C3
oklch(63% 0.095 264.4)
-
Step 600
600
#5572B0
oklch(55.7% 0.103 264.3)
-
Step 700
700
#455F97
oklch(49.1% 0.096 264.3)
-
Step 800
800
#394E7A
oklch(42.8% 0.078 264)
-
Step 900
900
#314163
oklch(37.8% 0.062 264.4)
-
Step 950
950 (this color)
#151E31
oklch(23.7% 0.039 264.3)
#151E31 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) | #172032 | 0.008 |
| Deuteranopia (no green cones) | #141D31 | 0.004 |
| Tritanopia (no blue cones) | #0A2225 | 0.034 |
| Achromatopsia (no color) | #1E1E1E | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151E31
#151E31
oklch(23.7% 0.039 264.3)
- #271D06
#271D06
oklch(23.7% 0.04 85.6)
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 #151E31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.021
- Dark #1B2431 ΔE 0.024
- Oxford Blue #1B263B ΔE 0.033
- Jet #212529 ΔE 0.039
- Navy Blue #001146 ΔE 0.068
- Space Cadet #2B2D42 ΔE 0.069
- Rich Navy #001219 ΔE 0.072
- Gunmetal #293241 ΔE 0.079
Use #151E31 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.