#243E64
Closest named color: Dark Grey Blue (#29465B). oklch(36.3% 0.074 257.8), rgb(36, 62, 100).
Aa
White text reads best on this color (10.77:1).
About this color
#243E64 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.074 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.034 away. White text reads best on it, at 10.77:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.94:1 |
| White text | 10.77:1 |
Values
| HEX | #243E64 |
| RGB | rgb(36, 62, 100) |
| HSL | hsl(216, 47%, 27%) |
| OKLCH | oklch(36.3% 0.074 257.8) |
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 #243E64 | 10.77:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #243E64 | 1.94:1 | Fails | Lc 9.1 | Not readable |
| #243E64 text on white | 10.77:1 | AAA | Lc 94.8 | Preferred for body text |
| #243E64 text on black | 1.94:1 | Fails | Lc -7.8 | 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
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#ABC2E5
oklch(80.9% 0.056 258.7)
-
Step 400
400
#7EA2D8
oklch(70.6% 0.089 258.3)
-
Step 500
500
#5D8ACD
oklch(63% 0.113 258.1)
-
Step 600
600
#4373BA
oklch(55.6% 0.123 258.1)
-
Step 700
700
#3460A0
oklch(49% 0.114 257.8)
-
Step 800
800
#2C4F82
oklch(42.7% 0.094 257.8)
-
Step 900
900 (this color)
#243E64
oklch(36.3% 0.074 257.8)
-
Step 950
950
#18273D
oklch(27.1% 0.046 257.8)
#243E64 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) | #2E4166 | 0.017 |
| Deuteranopia (no green cones) | #253B63 | 0.009 |
| Tritanopia (no blue cones) | #00474C | 0.063 |
| Achromatopsia (no color) | #3D3D3D | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243E64
#243E64
oklch(36.3% 0.074 257.8)
- #533803
#533803
oklch(36.3% 0.074 77.6)
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 #243E64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.036
- Marine Blue #01386A ΔE 0.037
- Twilight Blue #0A437A ΔE 0.040
- Dark Blue Grey #1F3B4D ΔE 0.041
- Charcoal #264653 ΔE 0.045
- Midnight Green #073B4C ΔE 0.052
- Marine #042E60 ΔE 0.062
Use #243E64 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.