#1B243C
Closest named color: Oxford Blue (#1B263B). oklch(26.4% 0.047 267.5), rgb(27, 36, 60).
Aa
White text reads best on this color (15.39:1).
About this color
#1B243C is a dark, muted blue. In OKLCH its lightness is 26%, its chroma 0.047 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.008 away. White text reads best on it, at 15.39:1.
| Hue family | Blues |
| Lightness | dark (26%) |
| Chroma | muted (0.047) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.36:1 |
| White text | 15.39:1 |
Values
| HEX | #1B243C |
| RGB | rgb(27, 36, 60) |
| HSL | hsl(224, 38%, 17%) |
| OKLCH | oklch(26.4% 0.047 267.5) |
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 #1B243C | 15.39:1 | AAA | Lc -105.0 | Preferred for body text |
| Black text on #1B243C | 1.36:1 | Fails | Lc 0.0 | Not readable |
| #1B243C text on white | 15.39:1 | AAA | Lc 102.3 | Preferred for body text |
| #1B243C 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EE
oklch(88.5% 0.031 267.2)
-
Step 300
300
#B1C0E6
oklch(80.9% 0.056 268.2)
-
Step 400
400
#889FD9
oklch(70.7% 0.089 267.5)
-
Step 500
500
#6B86CE
oklch(63% 0.113 267.5)
-
Step 600
600
#536FBB
oklch(55.6% 0.123 267.1)
-
Step 700
700
#445CA2
oklch(49.1% 0.116 267.8)
-
Step 800
800
#384C83
oklch(42.8% 0.095 267.3)
-
Step 900
900
#303F69
oklch(37.6% 0.075 267.8)
-
Step 950
950 (this color)
#1B243C
oklch(26.4% 0.047 267.5)
#1B243C 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) | #1B263D | 0.007 |
| Deuteranopia (no green cones) | #18233B | 0.006 |
| Tritanopia (no blue cones) | #0E292D | 0.041 |
| Achromatopsia (no color) | #252525 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B243C
#1B243C
oklch(26.4% 0.047 267.5)
- #2F2306
#2F2306
oklch(26.4% 0.047 85.9)
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 #1B243C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.008
- Dark #1B2431 ΔE 0.021
- Jet #212529 ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.042
- Rich Black #0D1B2A ΔE 0.050
- Gunmetal #293241 ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.067
- Marine #042E60 ΔE 0.069
Use #1B243C 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.