#10284B
Closest named color: Oxford Blue (#1B263B). oklch(27.9% 0.071 258), rgb(16, 40, 75).
Aa
White text reads best on this color (14.71:1).
About this color
#10284B is a dark, moderately saturated blue. In OKLCH its lightness is 28%, its chroma 0.071 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.031 away. White text reads best on it, at 14.71:1.
| Hue family | Blues |
| Lightness | dark (28%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.42:1 |
| White text | 14.71:1 |
Values
| HEX | #10284B |
| RGB | rgb(16, 40, 75) |
| HSL | hsl(216, 65%, 18%) |
| OKLCH | oklch(27.9% 0.071 258) |
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 #10284B | 14.71:1 | AAA | Lc -104.2 | Preferred for body text |
| Black text on #10284B | 1.42:1 | Fails | Lc 0.0 | Not readable |
| #10284B text on white | 14.71:1 | AAA | Lc 101.3 | Preferred for body text |
| #10284B text on black | 1.42:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C6DBF9
oklch(88.5% 0.047 257.3)
-
Step 300
300
#9FC3F7
oklch(81% 0.084 257.5)
-
Step 400
400
#69A1F4
oklch(70.6% 0.136 258.1)
-
Step 500
500
#3F87F0
oklch(63.1% 0.174 258.1)
-
Step 600
600
#1A6EDE
oklch(55.6% 0.188 258)
-
Step 700
700
#0A5BC1
oklch(49.1% 0.175 258)
-
Step 800
800
#0F4B9C
oklch(42.7% 0.145 258.1)
-
Step 900
900
#15407C
oklch(37.8% 0.112 257.7)
-
Step 950
950 (this color)
#10284B
oklch(27.9% 0.071 258)
#10284B 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) | #172B4C | 0.014 |
| Deuteranopia (no green cones) | #0D264A | 0.008 |
| Tritanopia (no blue cones) | #003035 | 0.057 |
| Achromatopsia (no color) | #282828 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10284B
#10284B
oklch(27.9% 0.071 258)
- #382400
#382400
oklch(27.8% 0.058 77.5)
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 #10284B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.031
- Marine #042E60 ΔE 0.040
- Space Cadet #2B2D42 ΔE 0.047
- Dark #1B2431 ΔE 0.048
- Prussian Blue #1D3557 ΔE 0.049
- Gunmetal #293241 ΔE 0.055
- Midnight Green #073B4C ΔE 0.063
- Jet #212529 ΔE 0.064
Use #10284B 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.