#284F5E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.6% 0.051 225.3), rgb(40, 79, 94).
Aa
White text reads best on this color (8.85:1).
About this color
#284F5E is a dark, muted teal or cyan. In OKLCH its lightness is 41%, its chroma 0.051 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.026 away. White text reads best on it, at 8.85:1.
| Hue family | Teals and cyans |
| Lightness | dark (41%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.37:1 |
| White text | 8.85:1 |
Values
| HEX | #284F5E |
| RGB | rgb(40, 79, 94) |
| HSL | hsl(197, 40%, 26%) |
| OKLCH | oklch(40.6% 0.051 225.3) |
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 #284F5E | 8.85:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #284F5E | 2.37:1 | Fails | Lc 13.8 | Not readable |
| #284F5E text on white | 8.85:1 | AAA | Lc 90.2 | Preferred for body text |
| #284F5E text on black | 2.37:1 | Fails | Lc -12.1 | 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 800.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CEDCE1
oklch(88.5% 0.017 221.1)
-
Step 300
300
#ADC5CF
oklch(80.9% 0.03 224.8)
-
Step 400
400
#81A7B7
oklch(70.6% 0.047 225.6)
-
Step 500
500
#6092A5
oklch(63.2% 0.061 223.9)
-
Step 600
600
#467C91
oklch(55.7% 0.066 225.2)
-
Step 700
700
#37687B
oklch(49.1% 0.061 225.4)
-
Step 800
800 (this color)
#284F5E
oklch(40.6% 0.051 225.3)
-
Step 900
900
#294652
oklch(37.7% 0.04 226.3)
-
Step 950
950
#192930
oklch(27% 0.025 227.2)
#284F5E 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) | #474D5F | 0.040 |
| Deuteranopia (no green cones) | #3F475E | 0.036 |
| Tritanopia (no blue cones) | #025454 | 0.036 |
| Achromatopsia (no color) | #4A4A4A | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284F5E
#284F5E
oklch(40.6% 0.051 225.3)
- #604032
#604032
oklch(40.4% 0.05 44.5)
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 #284F5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.028
- Deep Teal #00555A ΔE 0.031
- Charcoal #264653 ΔE 0.031
- Dark Teal #014D4E ΔE 0.040
- Dark Blue Green #005249 ΔE 0.049
- Petrol #005F6A ΔE 0.050
- Charcoal Grey #3C4142 ΔE 0.056
Use #284F5E 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.