#151D41
Closest named color: Oxford Blue (#1B263B). oklch(24.6% 0.069 271.1), rgb(21, 29, 65).
Aa
White text reads best on this color (16.35:1).
About this color
#151D41 is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.069 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.036 away. White text reads best on it, at 16.35:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.28:1 |
| White text | 16.35:1 |
Values
| HEX | #151D41 |
| RGB | rgb(21, 29, 65) |
| HSL | hsl(229, 51%, 17%) |
| OKLCH | oklch(24.6% 0.069 271.1) |
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 #151D41 | 16.35:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #151D41 | 1.28:1 | Fails | Lc 0.0 | Not readable |
| #151D41 text on white | 16.35:1 | AAA | Lc 103.2 | Preferred for body text |
| #151D41 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ADBEF6
oklch(80.8% 0.082 271.4)
-
Step 400
400
#839BF2
oklch(70.8% 0.13 271.1)
-
Step 500
500
#667FED
oklch(63.1% 0.167 271.3)
-
Step 600
600
#4F66DB
oklch(55.7% 0.18 271)
-
Step 700
700
#4053BE
oklch(49% 0.168 271.2)
-
Step 800
800
#35459A
oklch(42.7% 0.139 271.3)
-
Step 900
900
#2D3B7A
oklch(37.6% 0.108 271)
-
Step 950
950 (this color)
#151D41
oklch(24.6% 0.069 271.1)
#151D41 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) | #0B2242 | 0.018 |
| Deuteranopia (no green cones) | #041E40 | 0.020 |
| Tritanopia (no blue cones) | #00252B | 0.060 |
| Achromatopsia (no color) | #202020 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151D41
#151D41
oklch(24.6% 0.069 271.1)
- #2A1F00
#2A1F00
oklch(24.6% 0.05 89.5)
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 #151D41, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.036
- Dark #1B2431 ΔE 0.044
- Rich Black #0D1B2A ΔE 0.047
- Navy Blue #001146 ΔE 0.050
- Dark Indigo #1F0954 ΔE 0.058
- Jet #212529 ΔE 0.062
- Space Cadet #2B2D42 ΔE 0.067
- Marine #042E60 ΔE 0.072
Use #151D41 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.