#243F5D
Closest named color: Dark Grey Blue (#29465B). oklch(36.1% 0.062 252.2), rgb(36, 63, 93).
Aa
White text reads best on this color (10.80:1).
About this color
#243F5D is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.062 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.025 away. White text reads best on it, at 10.80:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.94:1 |
| White text | 10.80:1 |
Values
| HEX | #243F5D |
| RGB | rgb(36, 63, 93) |
| HSL | hsl(212, 44%, 25%) |
| OKLCH | oklch(36.1% 0.062 252.2) |
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 #243F5D | 10.80:1 | AAA | Lc -98.8 | Preferred for body text |
| Black text on #243F5D | 1.94:1 | Fails | Lc 9.0 | Not readable |
| #243F5D text on white | 10.80:1 | AAA | Lc 94.9 | Preferred for body text |
| #243F5D text on black | 1.94:1 | Fails | Lc -7.7 | 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
#E4EBF3
oklch(93.7% 0.013 251.6)
-
Step 200
200
#CDDBEA
oklch(88.5% 0.026 250)
-
Step 300
300
#ACC3DE
oklch(80.9% 0.046 252.5)
-
Step 400
400
#7FA4CE
oklch(70.7% 0.074 252)
-
Step 500
500
#5E8DC2
oklch(63.2% 0.095 252.3)
-
Step 600
600
#4376AE
oklch(55.6% 0.104 252.1)
-
Step 700
700
#356395
oklch(49.1% 0.095 252.1)
-
Step 800
800
#2C5179
oklch(42.7% 0.079 251.8)
-
Step 900
900 (this color)
#243F5D
oklch(36.1% 0.062 252.2)
-
Step 950
950
#182839
oklch(27.1% 0.038 250.8)
#243F5D 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) | #33405E | 0.020 |
| Deuteranopia (no green cones) | #2B3B5C | 0.014 |
| Tritanopia (no blue cones) | #00464A | 0.053 |
| Achromatopsia (no color) | #3D3D3D | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243F5D
#243F5D
oklch(36.1% 0.062 252.2)
- #513814
#513814
oklch(36.2% 0.062 73.3)
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 #243F5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.030
- Charcoal #264653 ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.034
- Midnight Green #073B4C ΔE 0.042
- Marine Blue #01386A ΔE 0.045
- Twilight Blue #0A437A ΔE 0.051
- Onyx #343A40 ΔE 0.051
Use #243F5D 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.