#243F4F
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.3% 0.043 235.8), rgb(36, 63, 79).
Aa
White text reads best on this color (11.05:1).
About this color
#243F4F is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.043 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.015 away. White text reads best on it, at 11.05:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.89:1 |
| White text | 11.05:1 |
Values
| HEX | #243F4F |
| RGB | rgb(36, 63, 79) |
| HSL | hsl(202, 37%, 23%) |
| OKLCH | oklch(35.3% 0.043 235.8) |
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 #243F4F | 11.05:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #243F4F | 1.89:1 | Fails | Lc 8.4 | Not readable |
| #243F4F text on white | 11.05:1 | AAA | Lc 95.5 | Preferred for body text |
| #243F4F text on black | 1.89:1 | 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
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CEDBE4
oklch(88.4% 0.019 237.8)
-
Step 300
300
#AEC4D3
oklch(80.8% 0.032 237.7)
-
Step 400
400
#82A6BD
oklch(70.7% 0.052 236.5)
-
Step 500
500
#6190AC
oklch(63% 0.066 235.4)
-
Step 600
600
#477A98
oklch(55.6% 0.072 235.9)
-
Step 700
700
#386782
oklch(49.2% 0.067 235.6)
-
Step 800
800
#2F5469
oklch(42.7% 0.055 234.9)
-
Step 900
900 (this color)
#243F4F
oklch(35.3% 0.043 235.8)
-
Step 950
950
#192932
oklch(27.1% 0.027 233.8)
#243F4F 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) | #383E50 | 0.028 |
| Deuteranopia (no green cones) | #323A4F | 0.023 |
| Tritanopia (no blue cones) | #0E4344 | 0.034 |
| Achromatopsia (no color) | #3C3C3C | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243F4F
#243F4F
oklch(35.3% 0.043 235.8)
- #4D3525
#4D3525
oklch(35.2% 0.043 54.5)
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 #243F4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.015
- Charcoal #264653 ΔE 0.023
- Dark Grey Blue #29465B ΔE 0.029
- Midnight Green #073B4C ΔE 0.030
- Onyx #343A40 ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.041
- Gunmetal #293241 ΔE 0.043
Use #243F4F 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.