#10243F
Closest named color: Oxford Blue (#1B263B). oklch(25.9% 0.057 256.5), rgb(16, 36, 63).
Aa
White text reads best on this color (15.59:1).
About this color
#10243F is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.057 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.019 away. White text reads best on it, at 15.59:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.34:1 |
| White text | 15.59:1 |
Values
| HEX | #10243F |
| RGB | rgb(16, 36, 63) |
| HSL | hsl(214, 59%, 15%) |
| OKLCH | oklch(25.9% 0.057 256.5) |
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 #10243F | 15.59:1 | AAA | Lc -105.1 | Preferred for body text |
| Black text on #10243F | 1.34:1 | Fails | Lc 0.0 | Not readable |
| #10243F text on white | 15.59:1 | AAA | Lc 102.4 | Preferred for body text |
| #10243F text on black | 1.34:1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#C9DBF2
oklch(88.5% 0.037 254.6)
-
Step 300
300
#A5C3ED
oklch(81% 0.068 256.8)
-
Step 400
400
#73A3E4
oklch(70.8% 0.109 256.2)
-
Step 500
500
#4E8ADC
oklch(63.1% 0.139 256.7)
-
Step 600
600
#3072C9
oklch(55.5% 0.151 256.6)
-
Step 700
700
#225FAE
oklch(49% 0.141 256.6)
-
Step 800
800
#1E4E8D
oklch(42.6% 0.117 256.6)
-
Step 900
900
#1E4271
oklch(37.8% 0.091 256.1)
-
Step 950
950 (this color)
#10243F
oklch(25.9% 0.057 256.5)
#10243F 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) | #182640 | 0.013 |
| Deuteranopia (no green cones) | #11223E | 0.007 |
| Tritanopia (no blue cones) | #002A2E | 0.046 |
| Achromatopsia (no color) | #242424 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10243F
#10243F
oklch(25.9% 0.057 256.5)
- #322000
#322000
oklch(26% 0.054 78.1)
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 #10243F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.019
- Dark #1B2431 ΔE 0.030
- Rich Black #0D1B2A ΔE 0.047
- Jet #212529 ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.053
- Gunmetal #293241 ΔE 0.063
- Marine #042E60 ΔE 0.063
- Navy Blue #001146 ΔE 0.067
Use #10243F 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.