#284D43
Closest named color: Dark Slate Gray (#2F4F4F). oklch(38.9% 0.046 174.3), rgb(40, 77, 67).
Aa
White text reads best on this color (9.40:1).
About this color
#284D43 is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.046 and its hue 174°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.022 away. White text reads best on it, at 9.40:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.23:1 |
| White text | 9.40:1 |
Values
| HEX | #284D43 |
| RGB | rgb(40, 77, 67) |
| HSL | hsl(164, 32%, 23%) |
| OKLCH | oklch(38.9% 0.046 174.3) |
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 #284D43 | 9.40:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #284D43 | 2.23:1 | Fails | Lc 12.3 | Not readable |
| #284D43 text on white | 9.40:1 | AAA | Lc 91.6 | Preferred for body text |
| #284D43 text on black | 2.23:1 | Fails | Lc -10.7 | 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
#F2F6F5
oklch(97% 0.004 179.7)
-
Step 100
100
#E3ECE9
oklch(93.5% 0.01 174.3)
-
Step 200
200
#CDDDD8
oklch(88.4% 0.018 175.3)
-
Step 300
300
#AAC8BF
oklch(80.8% 0.035 175.4)
-
Step 400
400
#7CAC9E
oklch(70.6% 0.055 174.7)
-
Step 500
500
#599886
oklch(63.2% 0.071 173.6)
-
Step 600
600
#3B8270
oklch(55.6% 0.077 174.4)
-
Step 700
700
#2D6E5E
oklch(49.1% 0.072 174.5)
-
Step 800
800
#275A4D
oklch(42.8% 0.059 174.3)
-
Step 900
900 (this color)
#284D43
oklch(38.9% 0.046 174.3)
-
Step 950
950
#162B25
oklch(26.9% 0.03 173.8)
#284D43 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) | #4B4943 | 0.049 |
| Deuteranopia (no green cones) | #454444 | 0.048 |
| Tritanopia (no blue cones) | #1B4E4A | 0.014 |
| Achromatopsia (no color) | #464646 | 0.047 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284D43
#284D43
oklch(38.9% 0.046 174.3)
- #593A46
#593A46
oklch(38.9% 0.047 354.6)
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 #284D43, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.022
- Dark Blue Green #005249 ΔE 0.026
- Dark Teal #014D4E ΔE 0.029
- Deep Teal #00555A ΔE 0.041
- Charcoal #264653 ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.045
- Evergreen #05472A ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.054
Use #284D43 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.