#243754
Closest named color: Prussian Blue (#1D3557). oklch(33.5% 0.057 258.6), rgb(36, 55, 84).
Aa
White text reads best on this color (12.00:1).
About this color
#243754 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.057 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.013 away. White text reads best on it, at 12.00:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.74:1 |
| White text | 12.00:1 |
Values
| HEX | #243754 |
| RGB | rgb(36, 55, 84) |
| HSL | hsl(216, 40%, 24%) |
| OKLCH | oklch(33.5% 0.057 258.6) |
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 #243754 | 12.00:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #243754 | 1.74:1 | Fails | Lc 0.0 | Not readable |
| #243754 text on white | 12.00:1 | AAA | Lc 97.4 | Preferred for body text |
| #243754 text on black | 1.74:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF2
oklch(93.6% 0.012 259.8)
-
Step 200
200
#D0DAE9
oklch(88.5% 0.023 258.4)
-
Step 300
300
#B0C2DD
oklch(80.9% 0.043 258.4)
-
Step 400
400
#87A2CC
oklch(70.7% 0.069 259.1)
-
Step 500
500
#698BBF
oklch(63.2% 0.088 258.7)
-
Step 600
600
#5074AB
oklch(55.6% 0.095 258.6)
-
Step 700
700
#416193
oklch(49.1% 0.089 259)
-
Step 800
800
#354F77
oklch(42.6% 0.074 258.8)
-
Step 900
900 (this color)
#243754
oklch(33.5% 0.057 258.6)
-
Step 950
950
#1B2738
oklch(27% 0.036 257.1)
#243754 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) | #2C3955 | 0.014 |
| Deuteranopia (no green cones) | #263453 | 0.009 |
| Tritanopia (no blue cones) | #0B3D41 | 0.051 |
| Achromatopsia (no color) | #363636 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243754
#243754
oklch(33.5% 0.057 258.6)
- #473310
#473310
oklch(33.6% 0.057 78.4)
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 #243754, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.013
- Dark Blue Grey #1F3B4D ΔE 0.021
- Midnight Green #073B4C ΔE 0.033
- Gunmetal #293241 ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.040
- Onyx #343A40 ΔE 0.045
- Marine Blue #01386A ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.049
Use #243754 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.