#10243D
Closest named color: Oxford Blue (#1B263B). oklch(25.8% 0.054 255), rgb(16, 36, 61).
Aa
White text reads best on this color (15.65:1).
About this color
#10243D is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.054 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.018 away. White text reads best on it, at 15.65:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.34:1 |
| White text | 15.65:1 |
Values
| HEX | #10243D |
| RGB | rgb(16, 36, 61) |
| HSL | hsl(213, 58%, 15%) |
| OKLCH | oklch(25.8% 0.054 255) |
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 #10243D | 15.65:1 | AAA | Lc -105.1 | Preferred for body text |
| Black text on #10243D | 1.34:1 | Fails | Lc 0.0 | Not readable |
| #10243D text on white | 15.65:1 | AAA | Lc 102.5 | Preferred for body text |
| #10243D 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CADBF1
oklch(88.6% 0.035 254.9)
-
Step 300
300
#A5C3EA
oklch(80.8% 0.064 255.1)
-
Step 400
400
#74A3E0
oklch(70.6% 0.103 255.3)
-
Step 500
500
#4F8BD7
oklch(63.1% 0.131 255.2)
-
Step 600
600
#3174C4
oklch(55.7% 0.142 254.8)
-
Step 700
700
#2361AA
oklch(49.2% 0.133 254.9)
-
Step 800
800
#1F4F89
oklch(42.6% 0.109 255)
-
Step 900
900
#1F426E
oklch(37.7% 0.086 255.3)
-
Step 950
950 (this color)
#10243D
oklch(25.8% 0.054 255)
#10243D 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) | #19263E | 0.014 |
| Deuteranopia (no green cones) | #13213C | 0.010 |
| Tritanopia (no blue cones) | #002A2D | 0.045 |
| Achromatopsia (no color) | #232323 | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10243D
#10243D
oklch(25.8% 0.054 255)
- #321F00
#321F00
oklch(25.7% 0.054 76)
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 #10243D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.018
- Dark #1B2431 ΔE 0.026
- Rich Black #0D1B2A ΔE 0.044
- Jet #212529 ΔE 0.045
- Space Cadet #2B2D42 ΔE 0.053
- Gunmetal #293241 ΔE 0.063
- Marine #042E60 ΔE 0.067
- Navy Blue #001146 ΔE 0.068
Use #10243D 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.