#284E5C
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.2% 0.049 224.2), rgb(40, 78, 92).
Aa
White text reads best on this color (8.99:1).
About this color
#284E5C is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.049 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.024 away. White text reads best on it, at 8.99:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.33:1 |
| White text | 8.99:1 |
Values
| HEX | #284E5C |
| RGB | rgb(40, 78, 92) |
| HSL | hsl(196, 39%, 26%) |
| OKLCH | oklch(40.2% 0.049 224.2) |
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 #284E5C | 8.99:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #284E5C | 2.33:1 | Fails | Lc 13.4 | Not readable |
| #284E5C text on white | 8.99:1 | AAA | Lc 90.5 | Preferred for body text |
| #284E5C text on black | 2.33:1 | Fails | Lc -11.8 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E3ECEF
oklch(93.7% 0.01 219.6)
-
Step 200
200
#CBDCE3
oklch(88.4% 0.021 224.3)
-
Step 300
300
#A8C6D3
oklch(80.9% 0.037 225.9)
-
Step 400
400
#78A9BC
oklch(70.7% 0.059 224)
-
Step 500
500
#5393AB
oklch(63% 0.075 224.4)
-
Step 600
600
#347D97
oklch(55.5% 0.082 224.8)
-
Step 700
700
#256A81
oklch(49.2% 0.077 223.9)
-
Step 800
800
#215669
oklch(42.6% 0.064 225)
-
Step 900
900 (this color)
#284E5C
oklch(40.2% 0.049 224.2)
-
Step 950
950
#142A32
oklch(27.1% 0.032 223.6)
#284E5C 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) | #464C5D | 0.039 |
| Deuteranopia (no green cones) | #3F475C | 0.035 |
| Tritanopia (no blue cones) | #055252 | 0.034 |
| Achromatopsia (no color) | #494949 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284E5C
#284E5C
oklch(40.2% 0.049 224.2)
- #5F4032
#5F4032
oklch(40.3% 0.049 45.2)
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 #284E5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.024
- Dark Grey Blue #29465B ΔE 0.026
- Charcoal #264653 ΔE 0.027
- Deep Teal #00555A ΔE 0.031
- Dark Teal #014D4E ΔE 0.038
- Dark Blue Green #005249 ΔE 0.048
- Charcoal Grey #3C4142 ΔE 0.053
- Petrol #005F6A ΔE 0.053
Use #284E5C 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.