#151E43
Closest named color: Oxford Blue (#1B263B). oklch(25% 0.071 270.3), rgb(21, 30, 67).
Aa
White text reads best on this color (16.17:1).
About this color
#151E43 is a very dark, moderately saturated blue. In OKLCH its lightness is 25%, its chroma 0.071 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.035 away. White text reads best on it, at 16.17:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.29:1 |
| White text | 16.17:1 |
Values
| HEX | #151E43 |
| RGB | rgb(21, 30, 67) |
| HSL | hsl(228, 52%, 17%) |
| OKLCH | oklch(25% 0.071 270.3) |
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 #151E43 | 16.17:1 | AAA | Lc -105.5 | Preferred for body text |
| Black text on #151E43 | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #151E43 text on white | 16.17:1 | AAA | Lc 103.0 | Preferred for body text |
| #151E43 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8F9
oklch(88.4% 0.047 270.8)
-
Step 300
300
#ACBEF8
oklch(80.8% 0.085 271.1)
-
Step 400
400
#819BF4
oklch(70.7% 0.134 270.4)
-
Step 500
500
#637FF0
oklch(63.1% 0.172 270.4)
-
Step 600
600
#4C65DE
oklch(55.5% 0.186 270.4)
-
Step 700
700
#3E53C1
oklch(49.1% 0.173 270.5)
-
Step 800
800
#33459C
oklch(42.8% 0.143 270.4)
-
Step 900
900
#2C3B7C
oklch(37.7% 0.111 270.5)
-
Step 950
950 (this color)
#151E43
oklch(25% 0.071 270.3)
#151E43 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) | #0B2344 | 0.018 |
| Deuteranopia (no green cones) | #041F42 | 0.019 |
| Tritanopia (no blue cones) | #00262D | 0.060 |
| Achromatopsia (no color) | #212121 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #151E43
#151E43
oklch(25% 0.071 270.3)
- #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 #151E43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.035
- Dark #1B2431 ΔE 0.045
- Rich Black #0D1B2A ΔE 0.050
- Navy Blue #001146 ΔE 0.052
- Dark Indigo #1F0954 ΔE 0.058
- Jet #212529 ΔE 0.063
- Space Cadet #2B2D42 ΔE 0.065
- Marine #042E60 ΔE 0.067
Use #151E43 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.