#283040
Closest named color: Gunmetal (#293241). oklch(30.9% 0.031 264), rgb(40, 48, 64).
Aa
White text reads best on this color (13.23:1).
About this color
#283040 is a dark, muted blue. In OKLCH its lightness is 31%, its chroma 0.031 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Gunmetal (#293241), ΔE 0.007 away. White text reads best on it, at 13.23:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Gunmetal (#293241) |
| Black text | 1.58:1 |
| White text | 13.23:1 |
Values
| HEX | #283040 |
| RGB | rgb(40, 48, 64) |
| HSL | hsl(220, 23%, 20%) |
| OKLCH | oklch(30.9% 0.031 264) |
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 #283040 | 13.23:1 | AAA | Lc -102.8 | Preferred for body text |
| Black text on #283040 | 1.58:1 | Fails | Lc 0.0 | Not readable |
| #283040 text on white | 13.23:1 | AAA | Lc 99.6 | Preferred for body text |
| #283040 text on black | 1.58:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D2D9E7
oklch(88.4% 0.021 264.5)
-
Step 300
300
#B5C1D9
oklch(80.9% 0.036 264.3)
-
Step 400
400
#8EA1C6
oklch(70.7% 0.058 263.6)
-
Step 500
500
#7289B8
oklch(63% 0.076 264.2)
-
Step 600
600
#5B73A4
oklch(55.7% 0.082 263.9)
-
Step 700
700
#4B608C
oklch(49.1% 0.076 264.3)
-
Step 800
800
#3D4E72
oklch(42.6% 0.064 264.5)
-
Step 900
900
#34415C
oklch(37.6% 0.05 264.3)
-
Step 950
950 (this color)
#283040
oklch(30.9% 0.031 264)
#283040 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) | #2B3141 | 0.006 |
| Deuteranopia (no green cones) | #282F40 | 0.003 |
| Tritanopia (no blue cones) | #213335 | 0.028 |
| Achromatopsia (no color) | #303030 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283040
#283040
oklch(30.9% 0.031 264)
- #372F1E
#372F1E
oklch(30.9% 0.03 85.5)
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 #283040, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Gunmetal #293241 ΔE 0.007
- Space Cadet #2B2D42 ΔE 0.012
- Dark Blue Grey #1F3B4D ΔE 0.038
- Onyx #343A40 ΔE 0.041
- Oxford Blue #1B263B ΔE 0.041
- Prussian Blue #1D3557 ΔE 0.042
- Midnight Green #073B4C ΔE 0.044
- Dark #1B2431 ΔE 0.051
Use #283040 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.