#243E4C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.9% 0.04 233.1), rgb(36, 62, 76).
Aa
White text reads best on this color (11.23:1).
About this color
#243E4C is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.040 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.013 away. White text reads best on it, at 11.23:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.86:1 |
| White text | 11.23:1 |
Values
| HEX | #243E4C |
| RGB | rgb(36, 62, 76) |
| HSL | hsl(201, 36%, 22%) |
| OKLCH | oklch(34.9% 0.04 233.1) |
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 #243E4C | 11.23:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #243E4C | 1.86:1 | Fails | Lc 8.0 | Not readable |
| #243E4C text on white | 11.23:1 | AAA | Lc 95.9 | Preferred for body text |
| #243E4C text on black | 1.86:1 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CFDBE3
oklch(88.5% 0.017 236.7)
-
Step 300
300
#AEC4D1
oklch(80.8% 0.03 233.7)
-
Step 400
400
#83A6BA
oklch(70.6% 0.048 233.4)
-
Step 500
500
#6390A9
oklch(63% 0.062 233.4)
-
Step 600
600
#497A94
oklch(55.5% 0.067 232.9)
-
Step 700
700
#3A677F
oklch(49.2% 0.063 233.3)
-
Step 800
800
#315467
oklch(42.8% 0.051 233.5)
-
Step 900
900 (this color)
#243E4C
oklch(34.9% 0.04 233.1)
-
Step 950
950
#1A2931
oklch(27.1% 0.025 232.2)
#243E4C 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) | #373D4D | 0.027 |
| Deuteranopia (no green cones) | #32394C | 0.024 |
| Tritanopia (no blue cones) | #114243 | 0.030 |
| Achromatopsia (no color) | #3B3B3B | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243E4C
#243E4C
oklch(34.9% 0.04 233.1)
- #4B3526
#4B3526
oklch(35% 0.04 55.3)
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 #243E4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.013
- Charcoal #264653 ΔE 0.027
- Onyx #343A40 ΔE 0.028
- Midnight Green #073B4C ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.034
- Gunmetal #293241 ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.041
Use #243E4C 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.