#284C63
Closest named color: Dark Grey Blue (#29465B). oklch(40% 0.057 238.5), rgb(40, 76, 99).
Aa
White text reads best on this color (9.11:1).
About this color
#284C63 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.057 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.021 away. White text reads best on it, at 9.11:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.30:1 |
| White text | 9.11:1 |
Values
| HEX | #284C63 |
| RGB | rgb(40, 76, 99) |
| HSL | hsl(203, 42%, 27%) |
| OKLCH | oklch(40% 0.057 238.5) |
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 #284C63 | 9.11:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #284C63 | 2.30:1 | Fails | Lc 13.1 | Not readable |
| #284C63 text on white | 9.11:1 | AAA | Lc 90.8 | Preferred for body text |
| #284C63 text on black | 2.30:1 | Fails | Lc -11.5 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CBDCE7
oklch(88.5% 0.024 236)
-
Step 300
300
#A8C5DA
oklch(80.9% 0.043 239.6)
-
Step 400
400
#78A7C7
oklch(70.7% 0.069 238.8)
-
Step 500
500
#5391B8
oklch(63.1% 0.087 237.9)
-
Step 600
600
#367BA4
oklch(55.7% 0.094 237.9)
-
Step 700
700
#27678D
oklch(49.1% 0.089 238.5)
-
Step 800
800
#225472
oklch(42.6% 0.073 238.2)
-
Step 900
900 (this color)
#284C63
oklch(40% 0.057 238.5)
-
Step 950
950
#152936
oklch(27% 0.036 238.5)
#284C63 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) | #424C64 | 0.033 |
| Deuteranopia (no green cones) | #394663 | 0.026 |
| Tritanopia (no blue cones) | #005254 | 0.045 |
| Achromatopsia (no color) | #484848 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284C63
#284C63
oklch(40% 0.057 238.5)
- #5F4028
#5F4028
oklch(40.1% 0.057 58)
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 #284C63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.021
- Charcoal #264653 ΔE 0.030
- Dark Slate Gray #2F4F4F ΔE 0.039
- Deep Teal #00555A ΔE 0.043
- Dark Teal #014D4E ΔE 0.048
- Deep Sea Blue #015482 ΔE 0.053
- Light Navy #155084 ΔE 0.055
- Twilight Blue #0A437A ΔE 0.058
Use #284C63 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.