#243240
Closest named color: Gunmetal (#293241). oklch(31.1% 0.032 248.9), rgb(36, 50, 64).
Aa
White text reads best on this color (13.08:1).
About this color
#243240 is a dark, muted blue. In OKLCH its lightness is 31%, its chroma 0.032 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.008 away. White text reads best on it, at 13.08:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.60:1 |
| White text | 13.08:1 |
Values
| HEX | #243240 |
| RGB | rgb(36, 50, 64) |
| HSL | hsl(210, 28%, 20%) |
| OKLCH | oklch(31.1% 0.032 248.9) |
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 #243240 | 13.08:1 | AAA | Lc -102.6 | Preferred for body text |
| Black text on #243240 | 1.60:1 | Fails | Lc 0.0 | Not readable |
| #243240 text on white | 13.08:1 | AAA | Lc 99.3 | Preferred for body text |
| #243240 text on black | 1.60:1 | 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 950.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CFDBE7
oklch(88.6% 0.021 248.1)
-
Step 300
300
#AFC3D8
oklch(80.9% 0.037 249.6)
-
Step 400
400
#84A4C5
oklch(70.7% 0.06 249.5)
-
Step 500
500
#658DB6
oklch(63% 0.076 249.7)
-
Step 600
600
#4B77A2
oklch(55.6% 0.083 249)
-
Step 700
700
#3C648B
oklch(49.1% 0.078 249.1)
-
Step 800
800
#325271
oklch(42.8% 0.064 248.8)
-
Step 900
900
#2C445B
oklch(37.8% 0.05 248.2)
-
Step 950
950 (this color)
#243240
oklch(31.1% 0.032 248.9)
#243240 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) | #2D3241 | 0.014 |
| Deuteranopia (no green cones) | #292F40 | 0.012 |
| Tritanopia (no blue cones) | #1A3537 | 0.026 |
| Achromatopsia (no color) | #313131 | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243240
#243240
oklch(31.1% 0.032 248.9)
- #3B2E1F
#3B2E1F
oklch(31.1% 0.031 70.3)
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 #243240, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.008
- Space Cadet #2B2D42 ΔE 0.020
- Dark Blue Grey #1F3B4D ΔE 0.032
- Midnight Green #073B4C ΔE 0.037
- Onyx #343A40 ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.041
- Oxford Blue #1B263B ΔE 0.044
- Dark #1B2431 ΔE 0.053
Use #243240 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.