#243749
Closest named color: Dark Blue Grey (#1F3B4D). oklch(32.9% 0.04 247.8), rgb(36, 55, 73).
Aa
White text reads best on this color (12.22:1).
About this color
#243749 is a dark, muted blue. In OKLCH its lightness is 33%, its chroma 0.040 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.014 away. White text reads best on it, at 12.22:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.71:1 |
| White text | 12.22:1 |
Values
| HEX | #243749 |
| RGB | rgb(36, 55, 73) |
| HSL | hsl(209, 34%, 21%) |
| OKLCH | oklch(32.9% 0.04 247.8) |
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 #243749 | 12.22:1 | AAA | Lc -101.3 | Preferred for body text |
| Black text on #243749 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #243749 text on white | 12.22:1 | AAA | Lc 97.8 | Preferred for body text |
| #243749 text on black | 1.71:1 | 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
#E5EAF0
oklch(93.5% 0.01 252.8)
-
Step 200
200
#D1DAE4
oklch(88.4% 0.017 250.9)
-
Step 300
300
#B2C3D4
oklch(81% 0.03 248.2)
-
Step 400
400
#89A4BE
oklch(70.7% 0.049 247.5)
-
Step 500
500
#6B8DAE
oklch(63% 0.063 248.1)
-
Step 600
600
#537799
oklch(55.6% 0.067 247.7)
-
Step 700
700
#436483
oklch(49.1% 0.063 247.7)
-
Step 800
800
#38526A
oklch(42.8% 0.051 247.1)
-
Step 900
900 (this color)
#243749
oklch(32.9% 0.04 247.8)
-
Step 950
950
#1C2832
oklch(27% 0.025 244)
#243749 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) | #30374A | 0.018 |
| Deuteranopia (no green cones) | #2B3449 | 0.013 |
| Tritanopia (no blue cones) | #153B3D | 0.034 |
| Achromatopsia (no color) | #353535 | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243749
#243749
oklch(32.9% 0.04 247.8)
- #43311E
#43311E
oklch(32.9% 0.04 67.2)
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 #243749, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.014
- Gunmetal #293241 ΔE 0.019
- Midnight Green #073B4C ΔE 0.026
- Prussian Blue #1D3557 ΔE 0.029
- Onyx #343A40 ΔE 0.032
- Space Cadet #2B2D42 ΔE 0.032
- Charcoal #264653 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.053
Use #243749 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.