#243E56
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.4% 0.053 247.6), rgb(36, 62, 86).
Aa
White text reads best on this color (11.06:1).
About this color
#243E56 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.053 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.019 away. White text reads best on it, at 11.06:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.89:1 |
| White text | 11.06:1 |
Values
| HEX | #243E56 |
| RGB | rgb(36, 62, 86) |
| HSL | hsl(209, 41%, 24%) |
| OKLCH | oklch(35.4% 0.053 247.6) |
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 #243E56 | 11.06:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #243E56 | 1.89:1 | Fails | Lc 8.4 | Not readable |
| #243E56 text on white | 11.06:1 | AAA | Lc 95.5 | Preferred for body text |
| #243E56 text on black | 1.89:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE7
oklch(88.5% 0.022 245.9)
-
Step 300
300
#ADC4DA
oklch(81% 0.04 247.1)
-
Step 400
400
#81A5C7
oklch(70.8% 0.064 247.3)
-
Step 500
500
#618EB8
oklch(63.1% 0.08 247.5)
-
Step 600
600
#4778A4
oklch(55.7% 0.087 247.1)
-
Step 700
700
#38648D
oklch(49% 0.082 248.3)
-
Step 800
800
#2F5272
oklch(42.7% 0.067 247.6)
-
Step 900
900 (this color)
#243E56
oklch(35.4% 0.053 247.6)
-
Step 950
950
#192836
oklch(27% 0.033 247.4)
#243E56 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) | #343F57 | 0.022 |
| Deuteranopia (no green cones) | #2D3A56 | 0.016 |
| Tritanopia (no blue cones) | #064446 | 0.046 |
| Achromatopsia (no color) | #3C3C3C | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243E56
#243E56
oklch(35.4% 0.053 247.6)
- #4E361B
#4E361B
oklch(35.4% 0.053 67.9)
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 #243E56, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.019
- Dark Grey Blue #29465B ΔE 0.027
- Charcoal #264653 ΔE 0.029
- Prussian Blue #1D3557 ΔE 0.032
- Midnight Green #073B4C ΔE 0.033
- Onyx #343A40 ΔE 0.041
- Gunmetal #293241 ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.050
Use #243E56 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.