#243761
Closest named color: Prussian Blue (#1D3557). oklch(34.3% 0.078 264.3), rgb(36, 55, 97).
Aa
White text reads best on this color (11.70:1).
About this color
#243761 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.078 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.021 away. White text reads best on it, at 11.70:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.79:1 |
| White text | 11.70:1 |
Values
| HEX | #243761 |
| RGB | rgb(36, 55, 97) |
| HSL | hsl(221, 46%, 26%) |
| OKLCH | oklch(34.3% 0.078 264.3) |
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 #243761 | 11.70:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #243761 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #243761 text on white | 11.70:1 | AAA | Lc 96.7 | Preferred for body text |
| #243761 text on black | 1.79:1 | 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 900.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CED9EF
oklch(88.4% 0.033 264.4)
-
Step 300
300
#AEC1E7
oklch(80.9% 0.058 264.2)
-
Step 400
400
#83A0DB
oklch(70.7% 0.093 264)
-
Step 500
500
#6587D2
oklch(63.1% 0.12 264.7)
-
Step 600
600
#4C70BF
oklch(55.7% 0.13 264.2)
-
Step 700
700
#3D5DA5
oklch(49.1% 0.121 264.4)
-
Step 800
800
#334C85
oklch(42.6% 0.1 264.7)
-
Step 900
900 (this color)
#243761
oklch(34.3% 0.078 264.3)
-
Step 950
950
#1A263F
oklch(27.1% 0.05 263.9)
#243761 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) | #253B63 | 0.013 |
| Deuteranopia (no green cones) | #1D3660 | 0.010 |
| Tritanopia (no blue cones) | #004047 | 0.068 |
| Achromatopsia (no color) | #383838 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243761
#243761
oklch(34.3% 0.078 264.3)
- #4A3500
#4A3500
oklch(34.4% 0.071 84)
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 #243761, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.021
- Marine Blue #01386A ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.042
- Marine #042E60 ΔE 0.044
- Midnight Green #073B4C ΔE 0.051
- Twilight Blue #0A437A ΔE 0.052
- Dark Grey Blue #29465B ΔE 0.053
- Gunmetal #293241 ΔE 0.056
Use #243761 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.