#243A50
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.1% 0.048 249.4), rgb(36, 58, 80).
Aa
White text reads best on this color (11.69:1).
About this color
#243A50 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.048 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.009 away. White text reads best on it, at 11.69:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.79:1 |
| White text | 11.69:1 |
Values
| HEX | #243A50 |
| RGB | rgb(36, 58, 80) |
| HSL | hsl(210, 38%, 23%) |
| OKLCH | oklch(34.1% 0.048 249.4) |
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 #243A50 | 11.69:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #243A50 | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #243A50 text on white | 11.69:1 | AAA | Lc 96.8 | Preferred for body text |
| #243A50 text on black | 1.79:1 | 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
#E5EBF1
oklch(93.7% 0.01 247.9)
-
Step 200
200
#CFDBE6
oklch(88.6% 0.02 245.7)
-
Step 300
300
#AFC3D7
oklch(80.8% 0.036 248.3)
-
Step 400
400
#85A4C4
oklch(70.7% 0.058 249.5)
-
Step 500
500
#678DB5
oklch(63.1% 0.074 250.3)
-
Step 600
600
#4D77A0
oklch(55.6% 0.08 248.9)
-
Step 700
700
#3E6489
oklch(49.1% 0.074 248.9)
-
Step 800
800
#34526F
oklch(42.8% 0.06 248.6)
-
Step 900
900 (this color)
#243A50
oklch(34.1% 0.048 249.4)
-
Step 950
950
#1B2835
oklch(27.1% 0.03 249)
#243A50 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) | #313B51 | 0.019 |
| Deuteranopia (no green cones) | #2B3650 | 0.015 |
| Tritanopia (no blue cones) | #0E3F42 | 0.040 |
| Achromatopsia (no color) | #383838 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243A50
#243A50
oklch(34.1% 0.048 249.4)
- #48331B
#48331B
oklch(33.9% 0.048 68.7)
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 #243A50, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.009
- Prussian Blue #1D3557 ΔE 0.025
- Midnight Green #073B4C ΔE 0.027
- Gunmetal #293241 ΔE 0.032
- Onyx #343A40 ΔE 0.035
- Charcoal #264653 ΔE 0.039
- Dark Grey Blue #29465B ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.043
Use #243A50 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.