#284E4A
Closest named color: Dark Slate Gray (#2F4F4F). oklch(39.4% 0.044 186.8), rgb(40, 78, 74).
Aa
White text reads best on this color (9.21:1).
About this color
#284E4A is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.044 and its hue 187°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.012 away. White text reads best on it, at 9.21:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #284E4A |
| RGB | rgb(40, 78, 74) |
| HSL | hsl(174, 32%, 23%) |
| OKLCH | oklch(39.4% 0.044 186.8) |
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 #284E4A | 9.21:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #284E4A | 2.27:1 | Fails | Lc 12.8 | Not readable |
| #284E4A text on white | 9.21:1 | AAA | Lc 91.1 | Preferred for body text |
| #284E4A text on black | 2.27:1 | Fails | Lc -11.2 | 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
#E3ECEB
oklch(93.6% 0.01 189.1)
-
Step 200
200
#CCDDDB
oklch(88.4% 0.018 188.3)
-
Step 300
300
#AAC8C4
oklch(80.9% 0.033 186.7)
-
Step 400
400
#7BACA6
oklch(70.8% 0.053 186.6)
-
Step 500
500
#569790
oklch(63.1% 0.068 186.7)
-
Step 600
600
#38817A
oklch(55.5% 0.073 186.8)
-
Step 700
700
#2A6D67
oklch(49% 0.068 187.1)
-
Step 800
800
#245954
oklch(42.7% 0.057 186.9)
-
Step 900
900 (this color)
#284E4A
oklch(39.4% 0.044 186.8)
-
Step 950
950
#152B29
oklch(27% 0.028 188.1)
#284E4A 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) | #4A4A4A | 0.047 |
| Deuteranopia (no green cones) | #44464A | 0.043 |
| Tritanopia (no blue cones) | #17504D | 0.014 |
| Achromatopsia (no color) | #484848 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284E4A
#284E4A
oklch(39.4% 0.044 186.8)
- #5B3C42
#5B3C42
oklch(39.4% 0.045 6.6)
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 #284E4A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.012
- Dark Teal #014D4E ΔE 0.026
- Dark Blue Green #005249 ΔE 0.027
- Deep Teal #00555A ΔE 0.033
- Charcoal #264653 ΔE 0.035
- Charcoal Grey #3C4142 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.046
- Evergreen #05472A ΔE 0.063
Use #284E4A 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.