#28424F
Closest named color: Charcoal (#264653). oklch(36.4% 0.039 231), rgb(40, 66, 79).
Aa
White text reads best on this color (10.59:1).
About this color
#28424F is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.039 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.013 away. White text reads best on it, at 10.59:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 1.98:1 |
| White text | 10.59:1 |
Values
| HEX | #28424F |
| RGB | rgb(40, 66, 79) |
| HSL | hsl(200, 33%, 23%) |
| OKLCH | oklch(36.4% 0.039 231) |
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 #28424F | 10.59:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #28424F | 1.98:1 | Fails | Lc 9.4 | Not readable |
| #28424F text on white | 10.59:1 | AAA | Lc 94.5 | Preferred for body text |
| #28424F text on black | 1.98:1 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CFDBE2
oklch(88.4% 0.016 233)
-
Step 300
300
#AEC5D0
oklch(81% 0.029 228.2)
-
Step 400
400
#83A6B9
oklch(70.6% 0.047 232)
-
Step 500
500
#6490A7
oklch(63% 0.059 231.7)
-
Step 600
600
#4A7A93
oklch(55.5% 0.065 232.3)
-
Step 700
700
#3A677D
oklch(49.1% 0.061 231)
-
Step 800
800
#315465
oklch(42.7% 0.049 230.5)
-
Step 900
900 (this color)
#28424F
oklch(36.4% 0.039 231)
-
Step 950
950
#1A2930
oklch(27.1% 0.024 228.7)
#28424F 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) | #3C4150 | 0.028 |
| Deuteranopia (no green cones) | #363D4F | 0.024 |
| Tritanopia (no blue cones) | #174646 | 0.029 |
| Achromatopsia (no color) | #3F3F3F | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28424F
#28424F
oklch(36.4% 0.039 231)
- #4F382B
#4F382B
oklch(36.3% 0.039 50.6)
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 #28424F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.013
- Dark Grey Blue #29465B ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.027
- Onyx #343A40 ΔE 0.032
- Charcoal Grey #3C4142 ΔE 0.033
- Midnight Green #073B4C ΔE 0.040
- Dark Teal #014D4E ΔE 0.043
- Dark Slate Gray #2F4F4F ΔE 0.046
Use #28424F 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.