#151C3E
Closest named color: Oxford Blue (#1B263B). oklch(24.1% 0.065 271.9), rgb(21, 28, 62).
Aa
White text reads best on this color (16.56:1).
About this color
#151C3E is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.065 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.037 away. White text reads best on it, at 16.56:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.26:1 |
| White text | 16.56:1 |
Values
| HEX | #151C3E |
| RGB | rgb(21, 28, 62) |
| HSL | hsl(230, 49%, 16%) |
| OKLCH | oklch(24.1% 0.065 271.9) |
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 #151C3E | 16.56:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #151C3E | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #151C3E text on white | 16.56:1 | AAA | Lc 103.4 | Preferred for body text |
| #151C3E 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9F9
oklch(93.5% 0.022 272.1)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#AFBEF3
oklch(80.9% 0.077 272.3)
-
Step 400
400
#869BEE
oklch(70.8% 0.124 272.1)
-
Step 500
500
#6980E8
oklch(63.2% 0.158 271.8)
-
Step 600
600
#5267D6
oklch(55.7% 0.171 271.7)
-
Step 700
700
#4354BA
oklch(49% 0.161 272)
-
Step 800
800
#374696
oklch(42.7% 0.132 271.7)
-
Step 900
900
#2F3B78
oklch(37.6% 0.104 272.1)
-
Step 950
950 (this color)
#151C3E
oklch(24.1% 0.065 271.9)
#151C3E 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) | #0B203F | 0.016 |
| Deuteranopia (no green cones) | #061D3D | 0.019 |
| Tritanopia (no blue cones) | #00242A | 0.058 |
| Achromatopsia (no color) | #1F1F1F | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151C3E
#151C3E
oklch(24.1% 0.065 271.9)
- #281E00
#281E00
oklch(24% 0.049 90.9)
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 #151C3E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.037
- Rich Black #0D1B2A ΔE 0.041
- Dark #1B2431 ΔE 0.042
- Navy Blue #001146 ΔE 0.050
- Jet #212529 ΔE 0.061
- Dark Indigo #1F0954 ΔE 0.061
- Space Cadet #2B2D42 ΔE 0.070
- Night Blue #040348 ΔE 0.074
Use #151C3E 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.