#243C4E
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.5% 0.044 242), rgb(36, 60, 78).
Aa
White text reads best on this color (11.46:1).
About this color
#243C4E is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.044 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.007 away. White text reads best on it, at 11.46:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.83:1 |
| White text | 11.46:1 |
Values
| HEX | #243C4E |
| RGB | rgb(36, 60, 78) |
| HSL | hsl(206, 37%, 22%) |
| OKLCH | oklch(34.5% 0.044 242) |
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 #243C4E | 11.46:1 | AAA | Lc -100.1 | Preferred for body text |
| Black text on #243C4E | 1.83:1 | Fails | Lc 7.5 | Not readable |
| #243C4E text on white | 11.46:1 | AAA | Lc 96.3 | Preferred for body text |
| #243C4E text on black | 1.83:1 | 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
#CFDBE4
oklch(88.5% 0.018 240)
-
Step 300
300
#AFC4D4
oklch(81% 0.032 240.7)
-
Step 400
400
#84A5BF
oklch(70.6% 0.053 242.2)
-
Step 500
500
#658FAF
oklch(63.2% 0.067 241.9)
-
Step 600
600
#4B799A
oklch(55.7% 0.072 241)
-
Step 700
700
#3C6584
oklch(49% 0.068 242.5)
-
Step 800
800
#32536B
oklch(42.7% 0.056 241.3)
-
Step 900
900 (this color)
#243C4E
oklch(34.5% 0.044 242)
-
Step 950
950
#1A2833
oklch(26.9% 0.028 242.7)
#243C4E 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) | #343C4F | 0.022 |
| Deuteranopia (no green cones) | #2F384E | 0.019 |
| Tritanopia (no blue cones) | #104042 | 0.035 |
| Achromatopsia (no color) | #393939 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243C4E
#243C4E
oklch(34.5% 0.044 242)
- #4A3421
#4A3421
oklch(34.5% 0.044 61.4)
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 #243C4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.007
- Midnight Green #073B4C ΔE 0.026
- Onyx #343A40 ΔE 0.030
- Charcoal #264653 ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.033
- Gunmetal #293241 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.037
- Charcoal Grey #3C4142 ΔE 0.046
Use #243C4E 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.