#284F4F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.9% 0.044 195.5), rgb(40, 79, 79).
Aa
White text reads best on this color (9.04:1).
About this color
#284F4F is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.044 and its hue 196°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.008 away. White text reads best on it, at 9.04:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.32:1 |
| White text | 9.04:1 |
Values
| HEX | #284F4F |
| RGB | rgb(40, 79, 79) |
| HSL | hsl(180, 33%, 23%) |
| OKLCH | oklch(39.9% 0.044 195.5) |
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 #284F4F | 9.04:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #284F4F | 2.32:1 | Fails | Lc 13.3 | Not readable |
| #284F4F text on white | 9.04:1 | AAA | Lc 90.7 | Preferred for body text |
| #284F4F text on black | 2.32:1 | Fails | Lc -11.6 | 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
#CCDDDD
oklch(88.5% 0.018 196.8)
-
Step 300
300
#A9C8C7
oklch(81% 0.033 194.1)
-
Step 400
400
#79ABAB
oklch(70.6% 0.053 196)
-
Step 500
500
#549796
oklch(63.2% 0.068 194.3)
-
Step 600
600
#358181
oklch(55.6% 0.074 195.2)
-
Step 700
700
#276D6D
oklch(49.2% 0.069 195.1)
-
Step 800
800
#225959
oklch(42.8% 0.057 195.2)
-
Step 900
900 (this color)
#284F4F
oklch(39.9% 0.044 195.5)
-
Step 950
950
#152B2B
oklch(27.1% 0.028 195.6)
#284F4F 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) | #4B4C4F | 0.047 |
| Deuteranopia (no green cones) | #44474F | 0.043 |
| Tritanopia (no blue cones) | #13514F | 0.017 |
| Achromatopsia (no color) | #494949 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284F4F
#284F4F
oklch(39.9% 0.044 195.5)
- #5D3E3F
#5D3E3F
oklch(40% 0.044 17.1)
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 #284F4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.008
- Dark Teal #014D4E ΔE 0.027
- Deep Teal #00555A ΔE 0.028
- Dark Blue Green #005249 ΔE 0.030
- Charcoal #264653 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.047
- Petrol #005F6A ΔE 0.057
Use #284F4F 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.