#151638
Closest named color: Rich Black (#0D1B2A). oklch(22.1% 0.065 278.4), rgb(21, 22, 56).
Aa
White text reads best on this color (17.44:1).
About this color
#151638 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.065 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.037 away. White text reads best on it, at 17.44:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.44:1 |
Values
| HEX | #151638 |
| RGB | rgb(21, 22, 56) |
| HSL | hsl(238, 45%, 15%) |
| OKLCH | oklch(22.1% 0.065 278.4) |
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 #151638 | 17.44:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #151638 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #151638 text on white | 17.44:1 | AAA | Lc 104.2 | Preferred for body text |
| #151638 text on black | 1.20:1 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F6
oklch(88.5% 0.043 278.2)
-
Step 300
300
#B5BCF2
oklch(80.9% 0.077 278.8)
-
Step 400
400
#9098EC
oklch(70.7% 0.123 278.6)
-
Step 500
500
#767CE6
oklch(63.1% 0.157 278.4)
-
Step 600
600
#6063D4
oklch(55.7% 0.17 278.2)
-
Step 700
700
#5051B7
oklch(49.1% 0.157 278.5)
-
Step 800
800
#414394
oklch(42.7% 0.13 278.3)
-
Step 900
900
#373976
oklch(37.6% 0.102 278.9)
-
Step 950
950 (this color)
#151638
oklch(22.1% 0.065 278.4)
#151638 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) | #051B39 | 0.025 |
| Deuteranopia (no green cones) | #021837 | 0.027 |
| Tritanopia (no blue cones) | #061E24 | 0.057 |
| Achromatopsia (no color) | #1A1A1A | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151638
#151638
oklch(22.1% 0.065 278.4)
- #201B00
#201B00
oklch(22.1% 0.046 99.8)
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 #151638, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.037
- Navy Blue #001146 ΔE 0.045
- Dark #1B2431 ΔE 0.054
- Oxford Blue #1B263B ΔE 0.055
- Dark Indigo #1F0954 ΔE 0.061
- Midnight Purple #280137 ΔE 0.062
- Night Blue #040348 ΔE 0.065
- Very Dark Purple #2A0134 ΔE 0.066
Use #151638 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.