#284A45
Closest named color: Dark Slate Gray (#2F4F4F). oklch(38.2% 0.041 183.7), rgb(40, 74, 69).
Aa
White text reads best on this color (9.74:1).
About this color
#284A45 is a dark, muted teal or cyan. In OKLCH its lightness is 38%, its chroma 0.041 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.023 away. White text reads best on it, at 9.74:1.
| Hue family | Teals and cyans |
| Lightness | dark (38%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.15:1 |
| White text | 9.74:1 |
Values
| HEX | #284A45 |
| RGB | rgb(40, 74, 69) |
| HSL | hsl(171, 30%, 22%) |
| OKLCH | oklch(38.2% 0.041 183.7) |
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 #284A45 | 9.74:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #284A45 | 2.15:1 | Fails | Lc 11.4 | Not readable |
| #284A45 text on white | 9.74:1 | AAA | Lc 92.5 | Preferred for body text |
| #284A45 text on black | 2.15:1 | Fails | Lc -9.9 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E4ECEA
oklch(93.6% 0.009 179.6)
-
Step 200
200
#CEDDDA
oklch(88.5% 0.017 182.7)
-
Step 300
300
#ACC7C3
oklch(80.8% 0.03 185.8)
-
Step 400
400
#7EABA4
oklch(70.7% 0.049 184.3)
-
Step 500
500
#5C968D
oklch(63.1% 0.063 183.4)
-
Step 600
600
#408077
oklch(55.5% 0.068 183.6)
-
Step 700
700
#316D64
oklch(49.2% 0.064 182.5)
-
Step 800
800
#2A5852
oklch(42.6% 0.052 184.4)
-
Step 900
900 (this color)
#284A45
oklch(38.2% 0.041 183.7)
-
Step 950
950
#172B28
oklch(27.1% 0.027 183.8)
#284A45 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) | #474745 | 0.043 |
| Deuteranopia (no green cones) | #414245 | 0.041 |
| Tritanopia (no blue cones) | #1B4B48 | 0.012 |
| Achromatopsia (no color) | #444444 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284A45
#284A45
oklch(38.2% 0.041 183.7)
- #563A40
#563A40
oklch(38.3% 0.041 5.1)
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 #284A45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.023
- Dark Teal #014D4E ΔE 0.026
- Charcoal #264653 ΔE 0.031
- Dark Blue Green #005249 ΔE 0.032
- Charcoal Grey #3C4142 ΔE 0.036
- Deep Teal #00555A ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.045
- Onyx #343A40 ΔE 0.052
Use #284A45 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.