#28403A
Closest named color: Onyx (#343A40). oklch(35% 0.032 176.9), rgb(40, 64, 58).
Aa
White text reads best on this color (11.14:1).
About this color
#28403A is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.032 and its hue 177°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.031 away. White text reads best on it, at 11.14:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.88:1 |
| White text | 11.14:1 |
Values
| HEX | #28403A |
| RGB | rgb(40, 64, 58) |
| HSL | hsl(165, 23%, 20%) |
| OKLCH | oklch(35% 0.032 176.9) |
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 #28403A | 11.14:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #28403A | 1.88:1 | Fails | Lc 8.2 | Not readable |
| #28403A text on white | 11.14:1 | AAA | Lc 95.7 | Preferred for body text |
| #28403A text on black | 1.88:1 | 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
#F3F6F5
oklch(97.1% 0.003 174.5)
-
Step 100
100
#E5EBEA
oklch(93.5% 0.007 185.3)
-
Step 200
200
#D1DCD9
oklch(88.5% 0.013 178)
-
Step 300
300
#B1C6C0
oklch(80.9% 0.024 176.7)
-
Step 400
400
#88A9A0
oklch(70.7% 0.039 176.7)
-
Step 500
500
#6A9489
oklch(63.2% 0.049 176.6)
-
Step 600
600
#517E73
oklch(55.7% 0.053 177.1)
-
Step 700
700
#416A60
oklch(49.1% 0.049 177)
-
Step 800
800
#36564E
oklch(42.6% 0.04 176.8)
-
Step 900
900 (this color)
#28403A
oklch(35% 0.032 176.9)
-
Step 950
950
#1C2A26
oklch(27.1% 0.02 175.1)
#28403A 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) | #3E3D3A | 0.033 |
| Deuteranopia (no green cones) | #3A3A3A | 0.032 |
| Tritanopia (no blue cones) | #21413E | 0.009 |
| Achromatopsia (no color) | #3B3B3B | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #28403A
#28403A
oklch(35% 0.032 176.9)
- #48343B
#48343B
oklch(35% 0.031 356)
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 #28403A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.031
- Charcoal Grey #3C4142 ΔE 0.034
- Charcoal #264653 ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.043
- Dark Teal #014D4E ΔE 0.048
- Midnight Green #073B4C ΔE 0.049
- Evergreen #05472A ΔE 0.051
- Gunmetal #293241 ΔE 0.053
Use #28403A 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.