#284D5E
Closest named color: Dark Grey Blue (#29465B). oklch(40% 0.051 229.6), rgb(40, 77, 94).
Aa
White text reads best on this color (9.07:1).
About this color
#284D5E is a dark, muted teal or cyan. In OKLCH its lightness is 40%, its chroma 0.051 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.022 away. White text reads best on it, at 9.07:1.
| Hue family | Teals and cyans |
| Lightness | dark (40%) |
| Chroma | muted (0.051) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.31:1 |
| White text | 9.07:1 |
Values
| HEX | #284D5E |
| RGB | rgb(40, 77, 94) |
| HSL | hsl(199, 40%, 26%) |
| OKLCH | oklch(40% 0.051 229.6) |
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 #284D5E | 9.07:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #284D5E | 2.31:1 | Fails | Lc 13.2 | Not readable |
| #284D5E text on white | 9.07:1 | AAA | Lc 90.8 | Preferred for body text |
| #284D5E text on black | 2.31:1 | Fails | Lc -11.6 | 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
#E3EBF0
oklch(93.5% 0.011 234.8)
-
Step 200
200
#CCDCE5
oklch(88.5% 0.021 232.2)
-
Step 300
300
#A8C6D5
oklch(80.9% 0.039 229.5)
-
Step 400
400
#78A8C0
oklch(70.6% 0.062 230.4)
-
Step 500
500
#5393B0
oklch(63.2% 0.079 229.2)
-
Step 600
600
#357C9B
oklch(55.5% 0.085 229.8)
-
Step 700
700
#276985
oklch(49.2% 0.079 229.7)
-
Step 800
800
#22566C
oklch(42.8% 0.066 229)
-
Step 900
900 (this color)
#284D5E
oklch(40% 0.051 229.6)
-
Step 950
950
#152933
oklch(26.9% 0.032 231.4)
#284D5E 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) | #444C5F | 0.036 |
| Deuteranopia (no green cones) | #3D465E | 0.032 |
| Tritanopia (no blue cones) | #035252 | 0.038 |
| Achromatopsia (no color) | #484848 | 0.051 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284D5E
#284D5E
oklch(40% 0.051 229.6)
- #5E402F
#5E402F
oklch(40.1% 0.05 50.4)
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 #284D5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.022
- Charcoal #264653 ΔE 0.026
- Dark Slate Gray #2F4F4F ΔE 0.029
- Deep Teal #00555A ΔE 0.035
- Dark Teal #014D4E ΔE 0.040
- Dark Blue Green #005249 ΔE 0.052
- Charcoal Grey #3C4142 ΔE 0.053
- Petrol #005F6A ΔE 0.056
Use #284D5E 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.