#151D49
Closest named color: Oxford Blue (#1B263B). oklch(25.3% 0.082 271.5), rgb(21, 29, 73).
Aa
White text reads best on this color (16.10:1).
About this color
#151D49 is a dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.082 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.044 away. White text reads best on it, at 16.10:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.30:1 |
| White text | 16.10:1 |
Values
| HEX | #151D49 |
| RGB | rgb(21, 29, 73) |
| HSL | hsl(231, 55%, 18%) |
| OKLCH | oklch(25.3% 0.082 271.5) |
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 #151D49 | 16.10:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #151D49 | 1.30:1 | Fails | Lc 0.0 | Not readable |
| #151D49 text on white | 16.10:1 | AAA | Lc 102.9 | Preferred for body text |
| #151D49 text on black | 1.30:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FE
oklch(88.5% 0.054 271.5)
-
Step 300
300
#AABDFF
oklch(80.8% 0.096 271.7)
-
Step 400
400
#7F98FF
oklch(70.6% 0.153 271.7)
-
Step 500
500
#617AFF
oklch(63% 0.198 271.6)
-
Step 600
600
#4B5EEF
oklch(55.5% 0.217 271.6)
-
Step 700
700
#3D4CD0
oklch(49% 0.202 271.6)
-
Step 800
800
#3240A8
oklch(42.7% 0.166 271.5)
-
Step 900
900
#2B3885
oklch(37.7% 0.129 271.5)
-
Step 950
950 (this color)
#151D49
oklch(25.3% 0.082 271.5)
#151D49 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) | #01234B | 0.025 |
| Deuteranopia (no green cones) | #001F48 | 0.023 |
| Tritanopia (no blue cones) | #00272F | 0.069 |
| Achromatopsia (no color) | #212121 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151D49
#151D49
oklch(25.3% 0.082 271.5)
- #2B2100
#2B2100
oklch(25.2% 0.052 92.1)
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 #151D49, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.044
- Navy Blue #001146 ΔE 0.049
- Dark Indigo #1F0954 ΔE 0.049
- Dark #1B2431 ΔE 0.056
- Rich Black #0D1B2A ΔE 0.061
- Marine #042E60 ΔE 0.062
- Space Cadet #2B2D42 ΔE 0.069
- Midnight Blue #191970 ΔE 0.071
Use #151D49 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.