#243E63
Closest named color: Dark Grey Blue (#29465B). oklch(36.2% 0.072 257.3), rgb(36, 62, 99).
Aa
White text reads best on this color (10.80:1).
About this color
#243E63 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.072 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.033 away. White text reads best on it, at 10.80:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #243E63 |
| RGB | rgb(36, 62, 99) |
| HSL | hsl(215, 47%, 26%) |
| OKLCH | oklch(36.2% 0.072 257.3) |
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 #243E63 | 10.80:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #243E63 | 1.94:1 | Fails | Lc 9.0 | Not readable |
| #243E63 text on white | 10.80:1 | AAA | Lc 94.9 | Preferred for body text |
| #243E63 text on black | 1.94:1 | Fails | Lc -7.7 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CDDAED
oklch(88.4% 0.03 257.8)
-
Step 300
300
#ABC2E4
oklch(80.8% 0.054 258)
-
Step 400
400
#7EA3D6
oklch(70.8% 0.086 256.5)
-
Step 500
500
#5D8BCC
oklch(63.2% 0.111 257.1)
-
Step 600
600
#4374B8
oklch(55.7% 0.119 256.9)
-
Step 700
700
#35619F
oklch(49.2% 0.111 257.3)
-
Step 800
800
#2C4F81
oklch(42.7% 0.093 257.5)
-
Step 900
900 (this color)
#243E63
oklch(36.2% 0.072 257.3)
-
Step 950
950
#18273D
oklch(27.1% 0.046 257.8)
#243E63 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) | #2E4165 | 0.017 |
| Deuteranopia (no green cones) | #263B62 | 0.009 |
| Tritanopia (no blue cones) | #00464B | 0.062 |
| Achromatopsia (no color) | #3D3D3D | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243E63
#243E63
oklch(36.2% 0.072 257.3)
- #523805
#523805
oklch(36.2% 0.072 78.1)
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 #243E63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.035
- Marine Blue #01386A ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.039
- Twilight Blue #0A437A ΔE 0.042
- Charcoal #264653 ΔE 0.043
- Midnight Green #073B4C ΔE 0.050
- Onyx #343A40 ΔE 0.061
Use #243E63 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.