#151838
Closest named color: Rich Black (#0D1B2A). oklch(22.6% 0.061 276.3), rgb(21, 24, 56).
Aa
White text reads best on this color (17.21:1).
About this color
#151838 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.061 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.034 away. White text reads best on it, at 17.21:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.21:1 |
Values
| HEX | #151838 |
| RGB | rgb(21, 24, 56) |
| HSL | hsl(235, 45%, 15%) |
| OKLCH | oklch(22.6% 0.061 276.3) |
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 #151838 | 17.21:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #151838 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #151838 text on white | 17.21:1 | AAA | Lc 104.0 | Preferred for body text |
| #151838 text on black | 1.21:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D7F4
oklch(88.4% 0.04 276.3)
-
Step 300
300
#B4BDF0
oklch(80.9% 0.073 276.8)
-
Step 400
400
#8D9AE8
oklch(70.7% 0.115 275.8)
-
Step 500
500
#737EE2
oklch(63.1% 0.149 276.5)
-
Step 600
600
#5D65CF
oklch(55.5% 0.161 276.5)
-
Step 700
700
#4D54B4
oklch(49.2% 0.15 276.3)
-
Step 800
800
#3F4591
oklch(42.7% 0.123 276.4)
-
Step 900
900
#353B74
oklch(37.8% 0.096 276.2)
-
Step 950
950 (this color)
#151838
oklch(22.6% 0.061 276.3)
#151838 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) | #091D39 | 0.021 |
| Deuteranopia (no green cones) | #051A37 | 0.022 |
| Tritanopia (no blue cones) | #051F25 | 0.054 |
| Achromatopsia (no color) | #1B1B1B | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151838
#151838
oklch(22.6% 0.061 276.3)
- #221C00
#221C00
oklch(22.7% 0.047 98)
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 #151838, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.034
- Navy Blue #001146 ΔE 0.048
- Dark #1B2431 ΔE 0.048
- Oxford Blue #1B263B ΔE 0.049
- Dark Indigo #1F0954 ΔE 0.063
- Jet #212529 ΔE 0.064
- Midnight Purple #280137 ΔE 0.067
- Very Dark Purple #2A0134 ΔE 0.070
Use #151838 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.