#10203E
Closest named color: Oxford Blue (#1B263B). oklch(24.8% 0.061 261.8), rgb(16, 32, 62).
Aa
White text reads best on this color (16.17:1).
About this color
#10203E is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.061 and its hue 262°. 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 16.17:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.29:1 |
| White text | 16.17:1 |
Values
| HEX | #10203E |
| RGB | rgb(16, 32, 62) |
| HSL | hsl(219, 59%, 15%) |
| OKLCH | oklch(24.8% 0.061 261.8) |
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 #10203E | 16.17:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #10203E | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #10203E text on white | 16.17:1 | AAA | Lc 103.0 | Preferred for body text |
| #10203E 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A7C1F0
oklch(80.8% 0.073 262.2)
-
Step 400
400
#78A0E9
oklch(70.7% 0.116 261.9)
-
Step 500
500
#5687E2
oklch(63.2% 0.147 261.7)
-
Step 600
600
#3B6ED0
oklch(55.5% 0.161 261.9)
-
Step 700
700
#2D5CB4
oklch(49.1% 0.149 261.5)
-
Step 800
800
#264B92
oklch(42.6% 0.125 261.9)
-
Step 900
900
#234074
oklch(37.8% 0.096 261.1)
-
Step 950
950 (this color)
#10203E
oklch(24.8% 0.061 261.8)
#10203E 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) | #12233F | 0.011 |
| Deuteranopia (no green cones) | #0B1F3D | 0.007 |
| Tritanopia (no blue cones) | #00272B | 0.052 |
| Achromatopsia (no color) | #212121 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10203E
#10203E
oklch(24.8% 0.061 261.8)
- #2D1E00
#2D1E00
oklch(24.7% 0.051 81.9)
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 #10203E, 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 0.035
- Rich Black #0D1B2A ΔE 0.040
- Jet #212529 ΔE 0.054
- Navy Blue #001146 ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.064
- Marine #042E60 ΔE 0.071
- Dark Indigo #1F0954 ΔE 0.071
Use #10203E 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.