#284A65
Closest named color: Dark Grey Blue (#29465B). oklch(39.6% 0.061 244.2), rgb(40, 74, 101).
Aa
White text reads best on this color (9.30:1).
About this color
#284A65 is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.061 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.019 away. White text reads best on it, at 9.30:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.25:1 |
| White text | 9.30:1 |
Values
| HEX | #284A65 |
| RGB | rgb(40, 74, 101) |
| HSL | hsl(207, 43%, 28%) |
| OKLCH | oklch(39.6% 0.061 244.2) |
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 #284A65 | 9.30:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #284A65 | 2.25:1 | Fails | Lc 12.6 | Not readable |
| #284A65 text on white | 9.30:1 | AAA | Lc 91.3 | Preferred for body text |
| #284A65 text on black | 2.25:1 | Fails | Lc -11.0 | 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
#CCDBE9
oklch(88.4% 0.025 246.2)
-
Step 300
300
#A8C5DD
oklch(81% 0.046 243.3)
-
Step 400
400
#79A6CB
oklch(70.7% 0.073 243.9)
-
Step 500
500
#558FBE
oklch(63% 0.094 244.5)
-
Step 600
600
#3879AA
oklch(55.6% 0.101 243.9)
-
Step 700
700
#2A6692
oklch(49.2% 0.094 243.7)
-
Step 800
800
#245377
oklch(42.7% 0.079 244.4)
-
Step 900
900 (this color)
#284A65
oklch(39.6% 0.061 244.2)
-
Step 950
950
#152838
oklch(26.9% 0.039 245.4)
#284A65 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) | #3E4A66 | 0.028 |
| Deuteranopia (no green cones) | #364464 | 0.023 |
| Tritanopia (no blue cones) | #005153 | 0.051 |
| Achromatopsia (no color) | #474747 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284A65
#284A65
oklch(39.6% 0.061 244.2)
- #5D3F21
#5D3F21
oklch(39.5% 0.061 64.4)
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 #284A65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.019
- Charcoal #264653 ΔE 0.031
- Dark Slate Gray #2F4F4F ΔE 0.046
- Deep Teal #00555A ΔE 0.050
- Twilight Blue #0A437A ΔE 0.051
- Light Navy #155084 ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.052
- Dark Teal #014D4E ΔE 0.053
Use #284A65 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.