#284E58
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40% 0.046 216.9), rgb(40, 78, 88).
Aa
White text reads best on this color (9.04:1).
About this color
#284E58 is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.046 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.018 away. White text reads best on it, at 9.04:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.32:1 |
| White text | 9.04:1 |
Values
| HEX | #284E58 |
| RGB | rgb(40, 78, 88) |
| HSL | hsl(193, 38%, 25%) |
| OKLCH | oklch(40% 0.046 216.9) |
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 #284E58 | 9.04:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #284E58 | 2.32:1 | Fails | Lc 13.3 | Not readable |
| #284E58 text on white | 9.04:1 | AAA | Lc 90.7 | Preferred for body text |
| #284E58 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
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E3ECEE
oklch(93.7% 0.01 212.5)
-
Step 200
200
#CCDDE1
oklch(88.6% 0.019 213.4)
-
Step 300
300
#A8C7CF
oklch(80.9% 0.035 215.1)
-
Step 400
400
#79AAB7
oklch(70.8% 0.055 216)
-
Step 500
500
#5494A5
oklch(63% 0.07 216.9)
-
Step 600
600
#357E91
oklch(55.5% 0.077 217.7)
-
Step 700
700
#266B7B
oklch(49.2% 0.072 216)
-
Step 800
800
#225764
oklch(42.7% 0.059 216.6)
-
Step 900
900 (this color)
#284E58
oklch(40% 0.046 216.9)
-
Step 950
950
#152A30
oklch(27% 0.029 218.2)
#284E58 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) | #474C59 | 0.041 |
| Deuteranopia (no green cones) | #404658 | 0.038 |
| Tritanopia (no blue cones) | #0B5251 | 0.029 |
| Achromatopsia (no color) | #494949 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284E58
#284E58
oklch(40% 0.046 216.9)
- #5E3F36
#5E3F36
oklch(40% 0.046 36.9)
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 #284E58, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.018
- Charcoal #264653 ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.028
- Deep Teal #00555A ΔE 0.029
- Dark Teal #014D4E ΔE 0.033
- Dark Blue Green #005249 ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.049
- Petrol #005F6A ΔE 0.054
Use #284E58 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.