#284563
Closest named color: Dark Grey Blue (#29465B). oklch(38.2% 0.062 250.5), rgb(40, 69, 99).
Aa
White text reads best on this color (9.89:1).
About this color
#284563 is a dark, muted blue. In OKLCH its lightness is 38%, its chroma 0.062 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.015 away. White text reads best on it, at 9.89:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.12:1 |
| White text | 9.89:1 |
Values
| HEX | #284563 |
| RGB | rgb(40, 69, 99) |
| HSL | hsl(211, 42%, 27%) |
| OKLCH | oklch(38.2% 0.062 250.5) |
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 #284563 | 9.89:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #284563 | 2.12:1 | Fails | Lc 11.1 | Not readable |
| #284563 text on white | 9.89:1 | AAA | Lc 92.8 | Preferred for body text |
| #284563 text on black | 2.12:1 | Fails | Lc -9.6 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CDDBEA
oklch(88.5% 0.026 250)
-
Step 300
300
#ABC3DE
oklch(80.8% 0.046 251.5)
-
Step 400
400
#7DA4CE
oklch(70.6% 0.075 250.8)
-
Step 500
500
#5B8DC1
oklch(63% 0.096 250.5)
-
Step 600
600
#4077AE
oklch(55.7% 0.104 250.2)
-
Step 700
700
#326495
oklch(49.2% 0.096 250)
-
Step 800
800
#2A5179
oklch(42.6% 0.08 250.8)
-
Step 900
900 (this color)
#284563
oklch(38.2% 0.062 250.5)
-
Step 950
950
#172839
oklch(27.1% 0.039 249.5)
#284563 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) | #394664 | 0.023 |
| Deuteranopia (no green cones) | #314062 | 0.018 |
| Tritanopia (no blue cones) | #004C4F | 0.055 |
| Achromatopsia (no color) | #434343 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284563
#284563
oklch(38.2% 0.062 250.5)
- #583D1A
#583D1A
oklch(38.3% 0.063 71)
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 #284563, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.015
- Charcoal #264653 ΔE 0.030
- Twilight Blue #0A437A ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.048
- Dark Slate Gray #2F4F4F ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.055
- Dark Teal #014D4E ΔE 0.058
- Marine Blue #01386A ΔE 0.058
Use #284563 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.