#284F63
Closest named color: Dark Grey Blue (#29465B). oklch(40.8% 0.056 232.7), rgb(40, 79, 99).
Aa
White text reads best on this color (8.79:1).
About this color
#284F63 is a dark, muted blue. In OKLCH its lightness is 41%, its chroma 0.056 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.029 away. White text reads best on it, at 8.79:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.38:1 |
| White text | 8.79:1 |
Values
| HEX | #284F63 |
| RGB | rgb(40, 79, 99) |
| HSL | hsl(200, 42%, 27%) |
| OKLCH | oklch(40.8% 0.056 232.7) |
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 #284F63 | 8.79:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #284F63 | 2.38:1 | Fails | Lc 14.0 | Not readable |
| #284F63 text on white | 8.79:1 | AAA | Lc 90.0 | Fine for body text |
| #284F63 text on black | 2.38:1 | Fails | Lc -12.3 | 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
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CEDBE3
oklch(88.4% 0.018 234.5)
-
Step 300
300
#ADC5D2
oklch(81% 0.032 231.4)
-
Step 400
400
#81A7BC
oklch(70.8% 0.052 232.6)
-
Step 500
500
#5F91AB
oklch(63.1% 0.066 231.9)
-
Step 600
600
#457B97
oklch(55.7% 0.072 232.7)
-
Step 700
700
#366781
oklch(49.1% 0.068 233.6)
-
Step 800
800 (this color)
#284F63
oklch(40.8% 0.056 232.7)
-
Step 900
900
#294655
oklch(37.8% 0.043 232.1)
-
Step 950
950
#182932
oklch(27% 0.028 232.3)
#284F63 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) | #454E64 | 0.037 |
| Deuteranopia (no green cones) | #3D4863 | 0.032 |
| Tritanopia (no blue cones) | #005456 | 0.040 |
| Achromatopsia (no color) | #4B4B4B | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284F63
#284F63
oklch(40.8% 0.056 232.7)
- #62412D
#62412D
oklch(40.8% 0.056 51.8)
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 #284F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.029
- Dark Slate Gray #2F4F4F ΔE 0.034
- Charcoal #264653 ΔE 0.035
- Deep Teal #00555A ΔE 0.036
- Dark Teal #014D4E ΔE 0.047
- Petrol #005F6A ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.052
- YInMn Blue #415A77 ΔE 0.055
Use #284F63 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.