#243E5E
Closest named color: Dark Grey Blue (#29465B). oklch(35.9% 0.064 254.4), rgb(36, 62, 94).
Aa
White text reads best on this color (10.90:1).
About this color
#243E5E is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.064 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.029 away. White text reads best on it, at 10.90:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.92:1 |
| White text | 10.90:1 |
Values
| HEX | #243E5E |
| RGB | rgb(36, 62, 94) |
| HSL | hsl(213, 45%, 25%) |
| OKLCH | oklch(35.9% 0.064 254.4) |
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 #243E5E | 10.90:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #243E5E | 1.92:1 | Fails | Lc 8.8 | Not readable |
| #243E5E text on white | 10.90:1 | AAA | Lc 95.1 | Preferred for body text |
| #243E5E text on black | 1.92:1 | Fails | Lc -7.5 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EBF3
oklch(93.7% 0.013 251.6)
-
Step 200
200
#CDDAEB
oklch(88.4% 0.027 255.1)
-
Step 300
300
#ACC3E0
oklch(80.9% 0.048 254.3)
-
Step 400
400
#7FA3D0
oklch(70.6% 0.077 254.3)
-
Step 500
500
#5F8CC4
oklch(63.1% 0.098 254.5)
-
Step 600
600
#4475B1
oklch(55.5% 0.108 254.4)
-
Step 700
700
#366298
oklch(49.1% 0.1 254.6)
-
Step 800
800
#2D507B
oklch(42.6% 0.083 254.5)
-
Step 900
900 (this color)
#243E5E
oklch(35.9% 0.064 254.4)
-
Step 950
950
#18273A
oklch(26.9% 0.041 254.8)
#243E5E 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) | #31405F | 0.019 |
| Deuteranopia (no green cones) | #293A5D | 0.013 |
| Tritanopia (no blue cones) | #004549 | 0.056 |
| Achromatopsia (no color) | #3D3D3D | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243E5E
#243E5E
oklch(35.9% 0.064 254.4)
- #513710
#513710
oklch(35.9% 0.065 73.6)
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 #243E5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.032
- Charcoal #264653 ΔE 0.037
- Marine Blue #01386A ΔE 0.042
- Midnight Green #073B4C ΔE 0.043
- Twilight Blue #0A437A ΔE 0.049
- Onyx #343A40 ΔE 0.053
Use #243E5E 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.