#284C4E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39% 0.042 200.2), rgb(40, 76, 78).
Aa
White text reads best on this color (9.40:1).
About this color
#284C4E is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.042 and its hue 200°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.013 away. White text reads best on it, at 9.40:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.23:1 |
| White text | 9.40:1 |
Values
| HEX | #284C4E |
| RGB | rgb(40, 76, 78) |
| HSL | hsl(183, 32%, 23%) |
| OKLCH | oklch(39% 0.042 200.2) |
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 #284C4E | 9.40:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #284C4E | 2.23:1 | Fails | Lc 12.3 | Not readable |
| #284C4E text on white | 9.40:1 | AAA | Lc 91.6 | Preferred for body text |
| #284C4E text on black | 2.23:1 | Fails | Lc -10.7 | 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
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEC
oklch(93.6% 0.01 197)
-
Step 200
200
#CDDDDE
oklch(88.6% 0.017 201.4)
-
Step 300
300
#AAC7C9
oklch(80.9% 0.031 201.7)
-
Step 400
400
#7CAAAD
oklch(70.6% 0.049 201.2)
-
Step 500
500
#589599
oklch(63% 0.064 201.1)
-
Step 600
600
#3B8083
oklch(55.7% 0.069 199.2)
-
Step 700
700
#2C6C6F
oklch(49.1% 0.065 199.5)
-
Step 800
800
#26585B
oklch(42.8% 0.054 200.6)
-
Step 900
900 (this color)
#284C4E
oklch(39% 0.042 200.2)
-
Step 950
950
#162A2C
oklch(26.9% 0.026 203.9)
#284C4E 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) | #47494E | 0.042 |
| Deuteranopia (no green cones) | #41444E | 0.040 |
| Tritanopia (no blue cones) | #154E4C | 0.018 |
| Achromatopsia (no color) | #464646 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284C4E
#284C4E
oklch(39% 0.042 200.2)
- #5A3C3C
#5A3C3C
oklch(39.1% 0.043 19.2)
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 #284C4E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.013
- Charcoal #264653 ΔE 0.025
- Dark Teal #014D4E ΔE 0.025
- Dark Blue Green #005249 ΔE 0.033
- Deep Teal #00555A ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.035
- Charcoal Grey #3C4142 ΔE 0.040
- Onyx #343A40 ΔE 0.057
Use #284C4E 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.