#284C64
Closest named color: Dark Grey Blue (#29465B). oklch(40.1% 0.058 239.6), rgb(40, 76, 100).
Aa
White text reads best on this color (9.09:1).
About this color
#284C64 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.058 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.021 away. White text reads best on it, at 9.09:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.30:1 |
| White text | 9.09:1 |
Values
| HEX | #284C64 |
| RGB | rgb(40, 76, 100) |
| HSL | hsl(204, 43%, 27%) |
| OKLCH | oklch(40.1% 0.058 239.6) |
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 #284C64 | 9.09:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #284C64 | 2.30:1 | Fails | Lc 13.2 | Not readable |
| #284C64 text on white | 9.09:1 | AAA | Lc 90.8 | Preferred for body text |
| #284C64 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
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CBDCE8
oklch(88.5% 0.025 238.4)
-
Step 300
300
#A8C5DA
oklch(80.9% 0.043 239.6)
-
Step 400
400
#78A7C8
oklch(70.7% 0.07 239.6)
-
Step 500
500
#5391BA
oklch(63.2% 0.089 239.3)
-
Step 600
600
#357AA6
oklch(55.5% 0.097 239.8)
-
Step 700
700
#27678E
oklch(49.1% 0.09 239.2)
-
Step 800
800
#225473
oklch(42.7% 0.074 239.1)
-
Step 900
900 (this color)
#284C64
oklch(40.1% 0.058 239.6)
-
Step 950
950
#142937
oklch(27% 0.038 239.4)
#284C64 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) | #414C65 | 0.032 |
| Deuteranopia (no green cones) | #394664 | 0.026 |
| Tritanopia (no blue cones) | #005254 | 0.046 |
| Achromatopsia (no color) | #484848 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284C64
#284C64
oklch(40.1% 0.058 239.6)
- #5F4026
#5F4026
oklch(40% 0.058 60)
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 #284C64, 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 0.031
- Dark Slate Gray #2F4F4F ΔE 0.041
- Deep Teal #00555A ΔE 0.044
- Dark Teal #014D4E ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.052
- Light Navy #155084 ΔE 0.053
- Twilight Blue #0A437A ΔE 0.057
Use #284C64 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.