#151B45
Closest named color: Navy Blue (#001146). oklch(24.4% 0.079 273), rgb(21, 27, 69).
Aa
White text reads best on this color (16.47:1).
About this color
#151B45 is a very dark, moderately saturated blue. In OKLCH its lightness is 24%, its chroma 0.079 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Navy Blue (#001146), ΔE 0.045 away. White text reads best on it, at 16.47:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Navy Blue (#001146) |
| Black text | 1.27:1 |
| White text | 16.47:1 |
Values
| HEX | #151B45 |
| RGB | rgb(21, 27, 69) |
| HSL | hsl(233, 53%, 18%) |
| OKLCH | oklch(24.4% 0.079 273) |
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 #151B45 | 16.47:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #151B45 | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #151B45 text on white | 16.47:1 | AAA | Lc 103.2 | Preferred for body text |
| #151B45 text on black | 1.27:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CDD8FC
oklch(88.5% 0.051 271.9)
-
Step 300
300
#ACBDFD
oklch(80.9% 0.093 272.7)
-
Step 400
400
#8398FD
oklch(70.8% 0.149 273.2)
-
Step 500
500
#667AFA
oklch(63% 0.19 273)
-
Step 600
600
#505FE9
oklch(55.5% 0.207 272.9)
-
Step 700
700
#424DCB
oklch(49% 0.193 273.1)
-
Step 800
800
#3640A4
oklch(42.6% 0.16 273.2)
-
Step 900
900
#2E3882
oklch(37.7% 0.124 273.1)
-
Step 950
950 (this color)
#151B45
oklch(24.4% 0.079 273)
#151B45 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) | #022146 | 0.025 |
| Deuteranopia (no green cones) | #001D44 | 0.025 |
| Tritanopia (no blue cones) | #00252C | 0.068 |
| Achromatopsia (no color) | #1F1F1F | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151B45
#151B45
oklch(24.4% 0.079 273)
- #281F00
#281F00
oklch(24.3% 0.05 93.2)
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 #151B45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Navy Blue #001146 ΔE 0.045
- Oxford Blue #1B263B ΔE 0.045
- Dark Indigo #1F0954 ΔE 0.049
- Dark #1B2431 ΔE 0.054
- Rich Black #0D1B2A ΔE 0.054
- Night Blue #040348 ΔE 0.068
- Marine #042E60 ΔE 0.071
- Jet #212529 ΔE 0.072
Use #151B45 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.