#3A5366
Closest named color: YInMn Blue (#415A77). oklch(43% 0.044 241.8), rgb(58, 83, 102).
Aa
White text reads best on this color (8.04:1).
About this color
#3A5366 is a dark, muted blue. In OKLCH its lightness is 43%, its chroma 0.044 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.034 away. White text reads best on it, at 8.04:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.60:1 |
| White text | 8.04:1 |
Values
| HEX | #3A5366 |
| RGB | rgb(58, 83, 102) |
| HSL | hsl(206, 28%, 31%) |
| OKLCH | oklch(43% 0.044 241.8) |
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 #3A5366 | 8.04:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #3A5366 | 2.60:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #3A5366 text on white | 8.04:1 | AAA | Lc 87.8 | Fine for body text |
| #3A5366 text on black | 2.60:1 | Fails | Lc -14.3 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E6EBEE
oklch(93.7% 0.007 233.6)
-
Step 200
200
#D1DAE2
oklch(88.4% 0.015 244.7)
-
Step 300
300
#B3C3D0
oklch(80.9% 0.025 242.4)
-
Step 400
400
#8BA4B8
oklch(70.6% 0.041 242.4)
-
Step 500
500
#6E8EA7
oklch(63.2% 0.052 242.1)
-
Step 600
600
#557892
oklch(55.6% 0.057 241.2)
-
Step 700
700
#45657C
oklch(49.1% 0.053 240.4)
-
Step 800
800 (this color)
#3A5366
oklch(43% 0.044 241.8)
-
Step 900
900
#314452
oklch(37.6% 0.034 240.7)
-
Step 950
950
#1D2830
oklch(27% 0.021 240.1)
#3A5366 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) | #4B5367 | 0.024 |
| Deuteranopia (no green cones) | #454E66 | 0.020 |
| Tritanopia (no blue cones) | #2A5859 | 0.036 |
| Achromatopsia (no color) | #505050 | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A5366
#3A5366
oklch(43% 0.044 241.8)
- #624A37
#624A37
oklch(42.9% 0.044 59.6)
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 #3A5366, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.034
- Dark Slate Gray #2F4F4F ΔE 0.042
- Dusty Grape #545775 ΔE 0.047
- Petrol #005F6A ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.050
- Deep Teal #00555A ΔE 0.050
- Dusk #4E5481 ΔE 0.055
- Light Navy Blue #2E5A88 ΔE 0.055
Use #3A5366 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.