#243F63
Closest named color: Dark Grey Blue (#29465B). oklch(36.5% 0.071 256.1), rgb(36, 63, 99).
Aa
White text reads best on this color (10.68:1).
About this color
#243F63 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.071 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.030 away. White text reads best on it, at 10.68:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.96:1 |
| White text | 10.68:1 |
Values
| HEX | #243F63 |
| RGB | rgb(36, 63, 99) |
| HSL | hsl(214, 47%, 26%) |
| OKLCH | oklch(36.5% 0.071 256.1) |
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 #243F63 | 10.68:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #243F63 | 1.96:1 | Fails | Lc 9.3 | Not readable |
| #243F63 text on white | 10.68:1 | AAA | Lc 94.6 | Preferred for body text |
| #243F63 text on black | 1.96:1 | Fails | Lc -8.0 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CDDAED
oklch(88.4% 0.03 257.8)
-
Step 300
300
#ABC3E3
oklch(81% 0.052 255.7)
-
Step 400
400
#7EA3D5
oklch(70.7% 0.084 256.1)
-
Step 500
500
#5C8BCA
oklch(63% 0.109 256.1)
-
Step 600
600
#4274B7
oklch(55.6% 0.118 256.3)
-
Step 700
700
#33619E
oklch(49% 0.111 256.2)
-
Step 800
800
#2B5080
oklch(42.8% 0.091 255.7)
-
Step 900
900 (this color)
#243F63
oklch(36.5% 0.071 256.1)
-
Step 950
950
#17273C
oklch(27% 0.045 255.6)
#243F63 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) | #304165 | 0.017 |
| Deuteranopia (no green cones) | #283B62 | 0.012 |
| Tritanopia (no blue cones) | #00474C | 0.060 |
| Achromatopsia (no color) | #3E3E3E | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243F63
#243F63
oklch(36.5% 0.071 256.1)
- #533809
#533809
oklch(36.3% 0.07 75.8)
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 #243F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.037
- Dark Blue Grey #1F3B4D ΔE 0.040
- Marine Blue #01386A ΔE 0.040
- Charcoal #264653 ΔE 0.041
- Twilight Blue #0A437A ΔE 0.041
- Midnight Green #073B4C ΔE 0.050
- Onyx #343A40 ΔE 0.061
Use #243F63 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.