#284D64
Closest named color: Dark Grey Blue (#29465B). oklch(40.3% 0.058 237.8), rgb(40, 77, 100).
Aa
White text reads best on this color (8.99:1).
About this color
#284D64 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.058 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.024 away. White text reads best on it, at 8.99:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.33:1 |
| White text | 8.99:1 |
Values
| HEX | #284D64 |
| RGB | rgb(40, 77, 100) |
| HSL | hsl(203, 43%, 27%) |
| OKLCH | oklch(40.3% 0.058 237.8) |
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 #284D64 | 8.99:1 | AAA | Lc -94.9 | Preferred for body text |
| Black text on #284D64 | 2.33:1 | Fails | Lc 13.5 | Not readable |
| #284D64 text on white | 8.99:1 | AAA | Lc 90.5 | Preferred for body text |
| #284D64 text on black | 2.33:1 | Fails | Lc -11.8 | 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
#CEDBE4
oklch(88.4% 0.019 237.8)
-
Step 300
300
#ADC4D4
oklch(80.8% 0.034 238.3)
-
Step 400
400
#81A6BF
oklch(70.7% 0.055 238.1)
-
Step 500
500
#6190AE
oklch(63.1% 0.068 237.3)
-
Step 600
600
#467A9A
oklch(55.6% 0.075 237.2)
-
Step 700
700
#386684
oklch(49.1% 0.07 239)
-
Step 800
800 (this color)
#284D64
oklch(40.3% 0.058 237.8)
-
Step 900
900
#2A4557
oklch(37.7% 0.045 238.8)
-
Step 950
950
#192933
oklch(27.1% 0.028 236.7)
#284D64 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) | #424D65 | 0.033 |
| Deuteranopia (no green cones) | #3A4664 | 0.029 |
| Tritanopia (no blue cones) | #005355 | 0.044 |
| Achromatopsia (no color) | #494949 | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284D64
#284D64
oklch(40.3% 0.058 237.8)
- #604028
#604028
oklch(40.2% 0.058 57.1)
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 #284D64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.024
- Charcoal #264653 ΔE 0.033
- Dark Slate Gray #2F4F4F ΔE 0.039
- Deep Teal #00555A ΔE 0.041
- Dark Teal #014D4E ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.051
- Light Navy #155084 ΔE 0.053
- Petrol #005F6A ΔE 0.056
Use #284D64 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.