#284C65
Closest named color: Dark Grey Blue (#29465B). oklch(40.1% 0.059 240.7), rgb(40, 76, 101).
Aa
White text reads best on this color (9.08:1).
About this color
#284C65 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.059 and its hue 241°. 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 9.08:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.059) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.31:1 |
| White text | 9.08:1 |
Values
| HEX | #284C65 |
| RGB | rgb(40, 76, 101) |
| HSL | hsl(205, 43%, 28%) |
| OKLCH | oklch(40.1% 0.059 240.7) |
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 #284C65 | 9.08:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #284C65 | 2.31:1 | Fails | Lc 13.2 | Not readable |
| #284C65 text on white | 9.08:1 | AAA | Lc 90.8 | Preferred for body text |
| #284C65 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
#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
#A8C5DB
oklch(80.9% 0.044 240.9)
-
Step 400
400
#78A7C9
oklch(70.7% 0.071 240.4)
-
Step 500
500
#5390BB
oklch(63% 0.091 241)
-
Step 600
600
#357AA8
oklch(55.6% 0.099 241)
-
Step 700
700
#276790
oklch(49.2% 0.092 240.6)
-
Step 800
800
#225475
oklch(42.8% 0.077 240.8)
-
Step 900
900 (this color)
#284C65
oklch(40.1% 0.059 240.7)
-
Step 950
950
#142937
oklch(27% 0.038 239.4)
#284C65 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) | #414C66 | 0.032 |
| Deuteranopia (no green cones) | #394665 | 0.026 |
| Tritanopia (no blue cones) | #005254 | 0.047 |
| Achromatopsia (no color) | #484848 | 0.059 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284C65
#284C65
oklch(40.1% 0.059 240.7)
- #5F4025
#5F4025
oklch(40% 0.059 60.9)
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 #284C65, 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 0.033
- Dark Slate Gray #2F4F4F ΔE 0.042
- Deep Teal #00555A ΔE 0.045
- Deep Sea Blue #015482 ΔE 0.051
- Dark Teal #014D4E ΔE 0.051
- Light Navy #155084 ΔE 0.052
- Twilight Blue #0A437A ΔE 0.056
Use #284C65 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.