#151D3A
Closest named color: Oxford Blue (#1B263B). oklch(24% 0.057 270.1), rgb(21, 29, 58).
Aa
White text reads best on this color (16.55:1).
About this color
#151D3A is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.057 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.033 away. White text reads best on it, at 16.55:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.26:1 |
| White text | 16.55:1 |
Values
| HEX | #151D3A |
| RGB | rgb(21, 29, 58) |
| HSL | hsl(227, 47%, 15%) |
| OKLCH | oklch(24% 0.057 270.1) |
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 #151D3A | 16.55:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #151D3A | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #151D3A text on white | 16.55:1 | AAA | Lc 103.4 | Preferred for body text |
| #151D3A 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5EAF7
oklch(93.7% 0.018 269.1)
-
Step 200
200
#CFD9F3
oklch(88.6% 0.037 268.9)
-
Step 300
300
#B0BFED
oklch(80.9% 0.067 270.7)
-
Step 400
400
#879DE4
oklch(70.7% 0.107 270.3)
-
Step 500
500
#6A83DC
oklch(63.1% 0.137 270.3)
-
Step 600
600
#526BCA
oklch(55.7% 0.149 269.9)
-
Step 700
700
#4359AE
oklch(49.2% 0.137 269.8)
-
Step 800
800
#37498D
oklch(42.7% 0.114 269.9)
-
Step 900
900
#2F3D71
oklch(37.6% 0.091 270.2)
-
Step 950
950 (this color)
#151D3A
oklch(24% 0.057 270.1)
#151D3A 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) | #11203B | 0.010 |
| Deuteranopia (no green cones) | #0C1D39 | 0.012 |
| Tritanopia (no blue cones) | #032328 | 0.050 |
| Achromatopsia (no color) | #1F1F1F | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151D3A
#151D3A
oklch(24% 0.057 270.1)
- #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 #151D3A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.033
- Rich Black #0D1B2A ΔE 0.034
- Dark #1B2431 ΔE 0.035
- Jet #212529 ΔE 0.053
- Navy Blue #001146 ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.068
- Dark Indigo #1F0954 ΔE 0.069
- Midnight Purple #280137 ΔE 0.078
Use #151D3A 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.