#243A4C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.8% 0.042 244.2), rgb(36, 58, 76).
Aa
White text reads best on this color (11.76:1).
About this color
#243A4C is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.042 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.006 away. White text reads best on it, at 11.76:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.78:1 |
| White text | 11.76:1 |
Values
| HEX | #243A4C |
| RGB | rgb(36, 58, 76) |
| HSL | hsl(207, 36%, 22%) |
| OKLCH | oklch(33.8% 0.042 244.2) |
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 #243A4C | 11.76:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #243A4C | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #243A4C text on white | 11.76:1 | AAA | Lc 97.0 | Preferred for body text |
| #243A4C text on black | 1.78:1 | 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
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#D0DBE4
oklch(88.6% 0.017 242.5)
-
Step 300
300
#B0C3D4
oklch(80.8% 0.032 245.2)
-
Step 400
400
#86A5BF
oklch(70.8% 0.051 243.9)
-
Step 500
500
#688EAE
oklch(63.1% 0.064 244.5)
-
Step 600
600
#4E789A
oklch(55.6% 0.071 244)
-
Step 700
700
#3F6583
oklch(49.1% 0.065 243.5)
-
Step 800
800
#34526B
oklch(42.6% 0.055 244.7)
-
Step 900
900 (this color)
#243A4C
oklch(33.8% 0.042 244.2)
-
Step 950
950
#1B2833
oklch(27% 0.027 244.6)
#243A4C 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) | #323A4D | 0.020 |
| Deuteranopia (no green cones) | #2D364C | 0.017 |
| Tritanopia (no blue cones) | #123E40 | 0.035 |
| Achromatopsia (no color) | #383838 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243A4C
#243A4C
oklch(33.8% 0.042 244.2)
- #473320
#473320
oklch(33.9% 0.042 64.2)
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 #243A4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.006
- Midnight Green #073B4C ΔE 0.025
- Gunmetal #293241 ΔE 0.028
- Onyx #343A40 ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.030
- Charcoal #264653 ΔE 0.039
- Space Cadet #2B2D42 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.043
Use #243A4C 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.