#284D4F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.4% 0.043 200.1), rgb(40, 77, 79).
Aa
White text reads best on this color (9.27:1).
About this color
#284D4F is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.043 and its hue 200°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.011 away. White text reads best on it, at 9.27:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.26:1 |
| White text | 9.27:1 |
Values
| HEX | #284D4F |
| RGB | rgb(40, 77, 79) |
| HSL | hsl(183, 33%, 23%) |
| OKLCH | oklch(39.4% 0.043 200.1) |
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 #284D4F | 9.27:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #284D4F | 2.26:1 | Fails | Lc 12.7 | Not readable |
| #284D4F text on white | 9.27:1 | AAA | Lc 91.3 | Preferred for body text |
| #284D4F text on black | 2.26:1 | Fails | Lc -11.1 | 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
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEC
oklch(93.6% 0.01 197)
-
Step 200
200
#CCDDDE
oklch(88.5% 0.018 201.1)
-
Step 300
300
#AAC7C9
oklch(80.9% 0.031 201.7)
-
Step 400
400
#7BABAD
oklch(70.8% 0.051 199.3)
-
Step 500
500
#579699
oklch(63.2% 0.065 199.6)
-
Step 600
600
#398084
oklch(55.6% 0.071 200.3)
-
Step 700
700
#2A6C6F
oklch(49.1% 0.066 199.4)
-
Step 800
800
#25585B
oklch(42.7% 0.054 200.5)
-
Step 900
900 (this color)
#284D4F
oklch(39.4% 0.043 200.1)
-
Step 950
950
#162A2C
oklch(26.9% 0.026 203.9)
#284D4F 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) | #484A4F | 0.043 |
| Deuteranopia (no green cones) | #42454F | 0.041 |
| Tritanopia (no blue cones) | #144F4D | 0.018 |
| Achromatopsia (no color) | #474747 | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284D4F
#284D4F
oklch(39.4% 0.043 200.1)
- #5B3D3C
#5B3D3C
oklch(39.4% 0.043 21.3)
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 #284D4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.011
- Dark Teal #014D4E ΔE 0.026
- Charcoal #264653 ΔE 0.027
- Deep Teal #00555A ΔE 0.031
- Dark Blue Green #005249 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.042
- Onyx #343A40 ΔE 0.060
Use #284D4F 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.