#284C45
Closest named color: Dark Slate Gray (#2F4F4F). oklch(38.7% 0.044 179.9), rgb(40, 76, 69).
Aa
White text reads best on this color (9.50:1).
About this color
#284C45 is a dark, muted teal or cyan. In OKLCH its lightness is 39%, its chroma 0.044 and its hue 180°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.020 away. White text reads best on it, at 9.50:1.
| Hue family | Teals and cyans |
| Lightness | dark (39%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.20:1 |
| White text | 9.50:1 |
Values
| HEX | #284C45 |
| RGB | rgb(40, 76, 69) |
| HSL | hsl(168, 31%, 23%) |
| OKLCH | oklch(38.7% 0.044 179.9) |
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 #284C45 | 9.50:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #284C45 | 2.20:1 | Fails | Lc 12.1 | Not readable |
| #284C45 text on white | 9.50:1 | AAA | Lc 91.9 | Preferred for body text |
| #284C45 text on black | 2.20:1 | Fails | Lc -10.5 | 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
#E3ECEA
oklch(93.6% 0.01 181.4)
-
Step 200
200
#CDDDD9
oklch(88.4% 0.018 179.3)
-
Step 300
300
#ABC8C1
oklch(80.9% 0.033 179.2)
-
Step 400
400
#7DACA2
oklch(70.8% 0.052 180.1)
-
Step 500
500
#5A978B
oklch(63.1% 0.066 180.1)
-
Step 600
600
#3D8175
oklch(55.5% 0.072 180.5)
-
Step 700
700
#2E6D62
oklch(49% 0.067 180.2)
-
Step 800
800
#285950
oklch(42.7% 0.055 179.9)
-
Step 900
900 (this color)
#284C45
oklch(38.7% 0.044 179.9)
-
Step 950
950
#172B27
oklch(27.1% 0.027 180)
#284C45 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) | #494845 | 0.046 |
| Deuteranopia (no green cones) | #434446 | 0.043 |
| Tritanopia (no blue cones) | #1A4D4A | 0.013 |
| Achromatopsia (no color) | #464646 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284C45
#284C45
oklch(38.7% 0.044 179.9)
- #583A43
#583A43
oklch(38.6% 0.044 359.8)
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 #284C45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.020
- Dark Teal #014D4E ΔE 0.026
- Dark Blue Green #005249 ΔE 0.028
- Charcoal #264653 ΔE 0.036
- Deep Teal #00555A ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.049
- Evergreen #05472A ΔE 0.056
Use #284C45 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.