#10234B
Closest named color: Oxford Blue (#1B263B). oklch(26.6% 0.078 263), rgb(16, 35, 75).
Aa
White text reads best on this color (15.39:1).
About this color
#10234B is a dark, moderately saturated blue. In OKLCH its lightness is 27%, its chroma 0.078 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.036 away. White text reads best on it, at 15.39:1.
| Hue family | Blues |
| Lightness | dark (27%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.36:1 |
| White text | 15.39:1 |
Values
| HEX | #10234B |
| RGB | rgb(16, 35, 75) |
| HSL | hsl(221, 65%, 18%) |
| OKLCH | oklch(26.6% 0.078 263) |
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 #10234B | 15.39:1 | AAA | Lc -104.8 | Preferred for body text |
| Black text on #10234B | 1.36:1 | Fails | Lc 0.0 | Not readable |
| #10234B text on white | 15.39:1 | AAA | Lc 102.1 | Preferred for body text |
| #10234B text on black | 1.36:1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C7DAFC
oklch(88.5% 0.051 262.1)
-
Step 300
300
#A1C1FD
oklch(80.9% 0.092 262.7)
-
Step 400
400
#6E9EFD
oklch(70.7% 0.149 262.9)
-
Step 500
500
#4982FA
oklch(63.1% 0.189 263)
-
Step 600
600
#2D68E9
oklch(55.7% 0.205 263)
-
Step 700
700
#2055CB
oklch(49.1% 0.192 263)
-
Step 800
800
#1C46A4
oklch(42.6% 0.159 263.2)
-
Step 900
900
#1C3C82
oklch(37.6% 0.124 263.2)
-
Step 950
950 (this color)
#10234B
oklch(26.6% 0.078 263)
#10234B 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) | #0D284C | 0.016 |
| Deuteranopia (no green cones) | #01224A | 0.015 |
| Tritanopia (no blue cones) | #002C33 | 0.062 |
| Achromatopsia (no color) | #252525 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10234B
#10234B
oklch(26.6% 0.078 263)
- #322200
#322200
oklch(26.5% 0.054 82.4)
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 #10234B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.036
- Marine #042E60 ΔE 0.047
- Dark #1B2431 ΔE 0.051
- Space Cadet #2B2D42 ΔE 0.058
- Navy Blue #001146 ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.063
- Dark Indigo #1F0954 ΔE 0.064
- Rich Black #0D1B2A ΔE 0.065
Use #10234B 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.