#243E53
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.3% 0.049 244.2), rgb(36, 62, 83).
Aa
White text reads best on this color (11.11:1).
About this color
#243E53 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.049 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.015 away. White text reads best on it, at 11.11:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.88:1 |
| White text | 11.11:1 |
Values
| HEX | #243E53 |
| RGB | rgb(36, 62, 83) |
| HSL | hsl(207, 39%, 23%) |
| OKLCH | oklch(35.3% 0.049 244.2) |
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 #243E53 | 11.11:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #243E53 | 1.88:1 | Fails | Lc 8.3 | Not readable |
| #243E53 text on white | 11.11:1 | AAA | Lc 95.6 | Preferred for body text |
| #243E53 text on black | 1.88:1 | 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
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE6
oklch(88.5% 0.021 243.4)
-
Step 300
300
#ADC4D7
oklch(80.9% 0.037 243.1)
-
Step 400
400
#82A5C3
oklch(70.7% 0.059 244.6)
-
Step 500
500
#628FB4
oklch(63.2% 0.075 244.2)
-
Step 600
600
#4778A0
oklch(55.5% 0.082 244.7)
-
Step 700
700
#396589
oklch(49.1% 0.076 244.9)
-
Step 800
800
#2F536F
oklch(42.8% 0.063 243.5)
-
Step 900
900 (this color)
#243E53
oklch(35.3% 0.049 244.2)
-
Step 950
950
#192835
oklch(27% 0.032 245.5)
#243E53 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) | #353E54 | 0.023 |
| Deuteranopia (no green cones) | #2F3953 | 0.020 |
| Tritanopia (no blue cones) | #0A4345 | 0.041 |
| Achromatopsia (no color) | #3B3B3B | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243E53
#243E53
oklch(35.3% 0.049 244.2)
- #4D361F
#4D361F
oklch(35.3% 0.049 65.1)
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 #243E53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.015
- Charcoal #264653 ΔE 0.027
- Dark Grey Blue #29465B ΔE 0.028
- Midnight Green #073B4C ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.034
- Onyx #343A40 ΔE 0.036
- Gunmetal #293241 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.047
Use #243E53 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.