#151A31
Closest named color: Rich Black (#0D1B2A). oklch(22.6% 0.045 273), rgb(21, 26, 49).
Aa
White text reads best on this color (17.15:1).
About this color
#151A31 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.045 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.020 away. White text reads best on it, at 17.15:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.22:1 |
| White text | 17.15:1 |
Values
| HEX | #151A31 |
| RGB | rgb(21, 26, 49) |
| HSL | hsl(229, 40%, 14%) |
| OKLCH | oklch(22.6% 0.045 273) |
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 #151A31 | 17.15:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #151A31 | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #151A31 text on white | 17.15:1 | AAA | Lc 104.0 | Preferred for body text |
| #151A31 text on black | 1.22:1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8ED
oklch(88.4% 0.03 273.1)
-
Step 300
300
#B5BFE4
oklch(80.9% 0.053 273.3)
-
Step 400
400
#8F9DD7
oklch(70.7% 0.087 273.5)
-
Step 500
500
#7484CC
oklch(63.1% 0.11 273.3)
-
Step 600
600
#5D6DB9
oklch(55.7% 0.119 273)
-
Step 700
700
#4C5A9F
oklch(49% 0.112 273)
-
Step 800
800
#3F4A81
oklch(42.7% 0.092 273.4)
-
Step 900
900
#353E67
oklch(37.6% 0.071 273.1)
-
Step 950
950 (this color)
#151A31
oklch(22.6% 0.045 273)
#151A31 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) | #111D32 | 0.011 |
| Deuteranopia (no green cones) | #0F1A30 | 0.010 |
| Tritanopia (no blue cones) | #0A1F23 | 0.040 |
| Achromatopsia (no color) | #1B1B1B | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151A31
#151A31
oklch(22.6% 0.045 273)
- #231B01
#231B01
oklch(22.5% 0.044 92.9)
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 #151A31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.020
- Dark #1B2431 ΔE 0.038
- Oxford Blue #1B263B ΔE 0.044
- Jet #212529 ΔE 0.052
- Navy Blue #001146 ΔE 0.060
- Rich Navy #001219 ΔE 0.067
- Midnight Purple #280137 ΔE 0.075
- Very Dark Purple #2A0134 ΔE 0.076
Use #151A31 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.