#10203D
Closest named color: Oxford Blue (#1B263B). oklch(24.7% 0.059 261.3), rgb(16, 32, 61).
Aa
White text reads best on this color (16.20:1).
About this color
#10203D is a very dark, muted blue. In OKLCH its lightness is 25%, its chroma 0.059 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.028 away. White text reads best on it, at 16.20:1.
| Hue family | Blues |
| Lightness | very dark (25%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.29:1 |
| White text | 16.20:1 |
Values
| HEX | #10203D |
| RGB | rgb(16, 32, 61) |
| HSL | hsl(219, 58%, 15%) |
| OKLCH | oklch(24.7% 0.059 261.3) |
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 #10203D | 16.20:1 | AAA | Lc -105.6 | Preferred for body text |
| Black text on #10203D | 1.29:1 | Fails | Lc 0.0 | Not readable |
| #10203D text on white | 16.20:1 | AAA | Lc 103.0 | Preferred for body text |
| #10203D 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
#CBDAF4
oklch(88.5% 0.039 261.5)
-
Step 300
300
#A7C2EF
oklch(81% 0.07 260.6)
-
Step 400
400
#79A0E7
oklch(70.6% 0.113 261.9)
-
Step 500
500
#5687E0
oklch(63.1% 0.145 261.4)
-
Step 600
600
#3B6FCE
oklch(55.6% 0.157 261.3)
-
Step 700
700
#2E5CB2
oklch(49% 0.146 261.5)
-
Step 800
800
#274C90
oklch(42.7% 0.12 261.4)
-
Step 900
900
#244073
oklch(37.8% 0.094 261.4)
-
Step 950
950 (this color)
#10203D
oklch(24.7% 0.059 261.3)
#10203D 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) | #13233E | 0.011 |
| Deuteranopia (no green cones) | #0C1F3C | 0.006 |
| Tritanopia (no blue cones) | #00272B | 0.050 |
| Achromatopsia (no color) | #202020 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10203D
#10203D
oklch(24.7% 0.059 261.3)
- #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 #10203D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.028
- Dark #1B2431 ΔE 0.034
- Rich Black #0D1B2A ΔE 0.039
- Jet #212529 ΔE 0.053
- Navy Blue #001146 ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.064
- Marine #042E60 ΔE 0.072
- Dark Indigo #1F0954 ΔE 0.073
Use #10203D 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.