#151E3B
Closest named color: Oxford Blue (#1B263B). oklch(24.4% 0.057 268.9), rgb(21, 30, 59).
Aa
White text reads best on this color (16.39:1).
About this color
#151E3B is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.057 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.030 away. White text reads best on it, at 16.39:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.39:1 |
Values
| HEX | #151E3B |
| RGB | rgb(21, 30, 59) |
| HSL | hsl(226, 48%, 16%) |
| OKLCH | oklch(24.4% 0.057 268.9) |
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 #151E3B | 16.39:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #151E3B | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #151E3B text on white | 16.39:1 | AAA | Lc 103.3 | Preferred for body text |
| #151E3B text on black | 1.28:1 | 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
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CFD9F3
oklch(88.6% 0.037 268.9)
-
Step 300
300
#AFC0ED
oklch(81% 0.067 268.7)
-
Step 400
400
#859DE4
oklch(70.6% 0.108 269.3)
-
Step 500
500
#6784DC
oklch(63.1% 0.137 268.5)
-
Step 600
600
#506BCA
oklch(55.5% 0.15 269.1)
-
Step 700
700
#4159AF
oklch(49.1% 0.14 269)
-
Step 800
800
#35498D
oklch(42.6% 0.115 268.8)
-
Step 900
900
#2E3E71
oklch(37.7% 0.09 268.7)
-
Step 950
950 (this color)
#151E3B
oklch(24.4% 0.057 268.9)
#151E3B 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) | #12213C | 0.010 |
| Deuteranopia (no green cones) | #0D1E3A | 0.011 |
| Tritanopia (no blue cones) | #022429 | 0.051 |
| Achromatopsia (no color) | #1F1F1F | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151E3B
#151E3B
oklch(24.4% 0.057 268.9)
- #2A1E00
#2A1E00
oklch(24.3% 0.05 87.2)
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 #151E3B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.030
- Dark #1B2431 ΔE 0.033
- Rich Black #0D1B2A ΔE 0.036
- Jet #212529 ΔE 0.052
- Navy Blue #001146 ΔE 0.057
- Space Cadet #2B2D42 ΔE 0.065
- Dark Indigo #1F0954 ΔE 0.070
- Gunmetal #293241 ΔE 0.077
Use #151E3B 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.