#284D66
Closest named color: Dark Grey Blue (#29465B). oklch(40.4% 0.06 240.1), rgb(40, 77, 102).
Aa
White text reads best on this color (8.96:1).
About this color
#284D66 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.060 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.025 away. White text reads best on it, at 8.96:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.34:1 |
| White text | 8.96:1 |
Values
| HEX | #284D66 |
| RGB | rgb(40, 77, 102) |
| HSL | hsl(204, 44%, 28%) |
| OKLCH | oklch(40.4% 0.06 240.1) |
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 #284D66 | 8.96:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #284D66 | 2.34:1 | Fails | Lc 13.5 | Not readable |
| #284D66 text on white | 8.96:1 | AAA | Lc 90.4 | Preferred for body text |
| #284D66 text on black | 2.34:1 | Fails | Lc -11.9 | 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 800.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CEDBE5
oklch(88.5% 0.02 240.8)
-
Step 300
300
#ADC4D5
oklch(80.8% 0.035 240)
-
Step 400
400
#81A6C0
oklch(70.7% 0.056 239.2)
-
Step 500
500
#6090B1
oklch(63.2% 0.072 239.4)
-
Step 600
600
#46799C
oklch(55.5% 0.078 240.1)
-
Step 700
700
#376686
oklch(49.1% 0.073 240.2)
-
Step 800
800 (this color)
#284D66
oklch(40.4% 0.06 240.1)
-
Step 900
900
#2A4558
oklch(37.7% 0.046 240.3)
-
Step 950
950
#192834
oklch(26.9% 0.03 243.3)
#284D66 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) | #424D67 | 0.033 |
| Deuteranopia (no green cones) | #394766 | 0.026 |
| Tritanopia (no blue cones) | #005355 | 0.047 |
| Achromatopsia (no color) | #494949 | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284D66
#284D66
oklch(40.4% 0.06 240.1)
- #614126
#614126
oklch(40.5% 0.06 60.1)
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 #284D66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.025
- Charcoal #264653 ΔE 0.035
- Dark Slate Gray #2F4F4F ΔE 0.042
- Deep Teal #00555A ΔE 0.044
- Deep Sea Blue #015482 ΔE 0.049
- Light Navy #155084 ΔE 0.050
- Dark Teal #014D4E ΔE 0.052
- Twilight Blue #0A437A ΔE 0.057
Use #284D66 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.