#151F3F
Closest named color: Oxford Blue (#1B263B). oklch(24.9% 0.062 268.6), rgb(21, 31, 63).
Aa
White text reads best on this color (16.15:1).
About this color
#151F3F is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.062 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.029 away. White text reads best on it, at 16.15:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.29:1 |
| White text | 16.15:1 |
Values
| HEX | #151F3F |
| RGB | rgb(21, 31, 63) |
| HSL | hsl(226, 50%, 16%) |
| OKLCH | oklch(24.9% 0.062 268.6) |
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 #151F3F | 16.15:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #151F3F | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #151F3F text on white | 16.15:1 | AAA | Lc 103.0 | Preferred for body text |
| #151F3F text on black | 1.29:1 | 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
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED9F5
oklch(88.6% 0.04 268.5)
-
Step 300
300
#ADBFF1
oklch(80.8% 0.074 269.3)
-
Step 400
400
#829DEA
oklch(70.7% 0.117 268.6)
-
Step 500
500
#6483E4
oklch(63.2% 0.15 268.5)
-
Step 600
600
#4C6AD2
oklch(55.6% 0.164 268.5)
-
Step 700
700
#3D58B6
oklch(49.2% 0.152 268.3)
-
Step 800
800
#334893
oklch(42.7% 0.126 268.8)
-
Step 900
900
#2C3D75
oklch(37.7% 0.098 268.7)
-
Step 950
950 (this color)
#151F3F
oklch(24.9% 0.062 268.6)
#151F3F 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) | #102340 | 0.013 |
| Deuteranopia (no green cones) | #0B1F3E | 0.013 |
| Tritanopia (no blue cones) | #00262B | 0.056 |
| Achromatopsia (no color) | #212121 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151F3F
#151F3F
oklch(24.9% 0.062 268.6)
- #2B2000
#2B2000
oklch(25% 0.051 90)
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 #151F3F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.029
- Dark #1B2431 ΔE 0.036
- Rich Black #0D1B2A ΔE 0.044
- Jet #212529 ΔE 0.055
- Navy Blue #001146 ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.062
- Dark Indigo #1F0954 ΔE 0.066
- Marine #042E60 ΔE 0.071
Use #151F3F 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.