#243D59
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.4% 0.058 252.3), rgb(36, 61, 89).
Aa
White text reads best on this color (11.13:1).
About this color
#243D59 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.058 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.023 away. White text reads best on it, at 11.13:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.88:1 |
| White text | 11.13:1 |
Values
| HEX | #243D59 |
| RGB | rgb(36, 61, 89) |
| HSL | hsl(212, 42%, 25%) |
| OKLCH | oklch(35.4% 0.058 252.3) |
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 #243D59 | 11.13:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #243D59 | 1.88:1 | Fails | Lc 8.3 | Not readable |
| #243D59 text on white | 11.13:1 | AAA | Lc 95.6 | Preferred for body text |
| #243D59 text on black | 1.88:1 | 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
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CEDBE9
oklch(88.6% 0.024 250.1)
-
Step 300
300
#ADC3DD
oklch(80.9% 0.044 252.7)
-
Step 400
400
#81A4CB
oklch(70.7% 0.069 251.5)
-
Step 500
500
#618DBE
oklch(63.2% 0.089 251.9)
-
Step 600
600
#4776AA
oklch(55.5% 0.096 252.1)
-
Step 700
700
#386392
oklch(49.1% 0.09 252)
-
Step 800
800
#2F5177
oklch(42.7% 0.075 252.4)
-
Step 900
900 (this color)
#243D59
oklch(35.4% 0.058 252.3)
-
Step 950
950
#192838
oklch(27.1% 0.036 250.8)
#243D59 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) | #323E5A | 0.019 |
| Deuteranopia (no green cones) | #2B3958 | 0.014 |
| Tritanopia (no blue cones) | #024347 | 0.050 |
| Achromatopsia (no color) | #3B3B3B | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243D59
#243D59
oklch(35.4% 0.058 252.3)
- #4E3616
#4E3616
oklch(35.3% 0.058 71.8)
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 #243D59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.023
- Prussian Blue #1D3557 ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.030
- Charcoal #264653 ΔE 0.035
- Midnight Green #073B4C ΔE 0.036
- Marine Blue #01386A ΔE 0.046
- Onyx #343A40 ΔE 0.046
- Gunmetal #293241 ΔE 0.048
Use #243D59 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.