#28404B
Closest named color: Charcoal (#264653). oklch(35.7% 0.035 228.5), rgb(40, 64, 75).
Aa
White text reads best on this color (10.90:1).
About this color
#28404B is a dark, muted teal or cyan. In OKLCH its lightness is 36%, its chroma 0.035 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Charcoal (#264653), ΔE 0.021 away. White text reads best on it, at 10.90:1.
| Hue family | Teals and cyans |
| Lightness | dark (36%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Charcoal (#264653) |
| Black text | 1.92:1 |
| White text | 10.90:1 |
Values
| HEX | #28404B |
| RGB | rgb(40, 64, 75) |
| HSL | hsl(199, 30%, 23%) |
| OKLCH | oklch(35.7% 0.035 228.5) |
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 #28404B | 10.90:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #28404B | 1.92:1 | Fails | Lc 8.7 | Not readable |
| #28404B text on white | 10.90:1 | AAA | Lc 95.2 | Preferred for body text |
| #28404B text on black | 1.92:1 | Fails | Lc -7.4 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D0DBE1
oklch(88.5% 0.015 231.2)
-
Step 300
300
#B0C4CE
oklch(80.8% 0.026 229.2)
-
Step 400
400
#86A6B6
oklch(70.7% 0.042 229.7)
-
Step 500
500
#6790A4
oklch(63.1% 0.054 229.7)
-
Step 600
600
#4D7A8F
oklch(55.5% 0.059 229.2)
-
Step 700
700
#3E6779
oklch(49.1% 0.054 227.8)
-
Step 800
800
#335463
oklch(42.7% 0.046 228.6)
-
Step 900
900 (this color)
#28404B
oklch(35.7% 0.035 228.5)
-
Step 950
950
#1B292F
oklch(27.1% 0.022 226.4)
#28404B 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) | #3A3F4C | 0.026 |
| Deuteranopia (no green cones) | #353B4B | 0.023 |
| Tritanopia (no blue cones) | #1A4343 | 0.025 |
| Achromatopsia (no color) | #3D3D3D | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28404B
#28404B
oklch(35.7% 0.035 228.5)
- #4C372C
#4C372C
oklch(35.7% 0.035 48.8)
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 #28404B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Charcoal #264653 ΔE 0.021
- Dark Blue Grey #1F3B4D ΔE 0.022
- Onyx #343A40 ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.030
- Charcoal Grey #3C4142 ΔE 0.032
- Midnight Green #073B4C ΔE 0.036
- Gunmetal #293241 ΔE 0.045
- Dark Teal #014D4E ΔE 0.046
Use #28404B 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.