#243F65
Closest named color: Dark Grey Blue (#29465B). oklch(36.6% 0.074 257.1), rgb(36, 63, 101).
Aa
White text reads best on this color (10.63:1).
About this color
#243F65 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.074 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.033 away. White text reads best on it, at 10.63:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.63:1 |
Values
| HEX | #243F65 |
| RGB | rgb(36, 63, 101) |
| HSL | hsl(215, 47%, 27%) |
| OKLCH | oklch(36.6% 0.074 257.1) |
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 #243F65 | 10.63:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #243F65 | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #243F65 text on white | 10.63:1 | AAA | Lc 94.5 | Preferred for body text |
| #243F65 text on black | 1.97:1 | Fails | Lc -8.1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF5
oklch(93.5% 0.017 259.4)
-
Step 200
200
#CDDAEE
oklch(88.5% 0.031 258.9)
-
Step 300
300
#AAC2E5
oklch(80.8% 0.056 257.7)
-
Step 400
400
#7DA3D8
oklch(70.8% 0.089 256.8)
-
Step 500
500
#5C8BCD
oklch(63.2% 0.113 257)
-
Step 600
600
#4174BA
oklch(55.7% 0.122 256.8)
-
Step 700
700
#3361A0
oklch(49.2% 0.113 256.8)
-
Step 800
800
#2B4F82
oklch(42.7% 0.095 257.3)
-
Step 900
900 (this color)
#243F65
oklch(36.6% 0.074 257.1)
-
Step 950
950
#17273D
oklch(27% 0.047 256.6)
#243F65 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) | #2F4267 | 0.018 |
| Deuteranopia (no green cones) | #263C64 | 0.009 |
| Tritanopia (no blue cones) | #00484D | 0.063 |
| Achromatopsia (no color) | #3E3E3E | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243F65
#243F65
oklch(36.6% 0.074 257.1)
- #543904
#543904
oklch(36.7% 0.074 77.8)
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 #243F65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.033
- Twilight Blue #0A437A ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.039
- Marine Blue #01386A ΔE 0.039
- Dark Blue Grey #1F3B4D ΔE 0.043
- Charcoal #264653 ΔE 0.044
- Midnight Green #073B4C ΔE 0.053
- Onyx #343A40 ΔE 0.064
Use #243F65 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.