#243F53
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.5% 0.048 241.9), rgb(36, 63, 83).
Aa
White text reads best on this color (10.98:1).
About this color
#243F53 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.048 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.017 away. White text reads best on it, at 10.98:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.91:1 |
| White text | 10.98:1 |
Values
| HEX | #243F53 |
| RGB | rgb(36, 63, 83) |
| HSL | hsl(206, 39%, 23%) |
| OKLCH | oklch(35.5% 0.048 241.9) |
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 #243F53 | 10.98:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #243F53 | 1.91:1 | Fails | Lc 8.6 | Not readable |
| #243F53 text on white | 10.98:1 | AAA | Lc 95.3 | Preferred for body text |
| #243F53 text on black | 1.91:1 | Fails | Lc -7.3 | 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
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CEDBE5
oklch(88.5% 0.02 240.8)
-
Step 300
300
#ADC4D6
oklch(80.9% 0.036 241.6)
-
Step 400
400
#81A6C2
oklch(70.8% 0.058 241.3)
-
Step 500
500
#608FB3
oklch(63.1% 0.075 242.3)
-
Step 600
600
#46799E
oklch(55.6% 0.08 241.7)
-
Step 700
700
#376687
oklch(49.1% 0.074 241.1)
-
Step 800
800
#2E536E
oklch(42.7% 0.062 241.9)
-
Step 900
900 (this color)
#243F53
oklch(35.5% 0.048 241.9)
-
Step 950
950
#192834
oklch(26.9% 0.03 243.3)
#243F53 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) | #363F54 | 0.025 |
| Deuteranopia (no green cones) | #303A53 | 0.021 |
| Tritanopia (no blue cones) | #094446 | 0.039 |
| Achromatopsia (no color) | #3C3C3C | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243F53
#243F53
oklch(35.5% 0.048 241.9)
- #4E3621
#4E3621
oklch(35.5% 0.048 61.5)
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 #243F53, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.017
- Charcoal #264653 ΔE 0.024
- Dark Grey Blue #29465B ΔE 0.026
- Midnight Green #073B4C ΔE 0.032
- Onyx #343A40 ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.037
- Charcoal Grey #3C4142 ΔE 0.045
- Gunmetal #293241 ΔE 0.046
Use #243F53 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.