#3A4366
Closest named color: Dark Grey Blue (#29465B). oklch(39.1% 0.061 272.3), rgb(58, 67, 102).
Aa
White text reads best on this color (9.65:1).
About this color
#3A4366 is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.061 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.033 away. White text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #3A4366 |
| RGB | rgb(58, 67, 102) |
| HSL | hsl(228, 28%, 31%) |
| OKLCH | oklch(39.1% 0.061 272.3) |
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 #3A4366 | 9.65:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #3A4366 | 2.17:1 | Fails | Lc 11.6 | Not readable |
| #3A4366 text on white | 9.65:1 | AAA | Lc 92.3 | Preferred for body text |
| #3A4366 text on black | 2.17:1 | Fails | Lc -10.1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D3D9EA
oklch(88.6% 0.024 270.3)
-
Step 300
300
#B6BFDF
oklch(80.8% 0.046 272.9)
-
Step 400
400
#919ECF
oklch(70.7% 0.073 272.9)
-
Step 500
500
#7686C2
oklch(63.2% 0.093 272.1)
-
Step 600
600
#5F6FAF
oklch(55.7% 0.101 272.1)
-
Step 700
700
#4E5C96
oklch(49% 0.095 272.2)
-
Step 800
800
#404C7A
oklch(42.8% 0.078 271.7)
-
Step 900
900 (this color)
#3A4366
oklch(39.1% 0.061 272.3)
-
Step 950
950
#202539
oklch(26.9% 0.038 272.9)
#3A4366 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) | #374767 | 0.012 |
| Deuteranopia (no green cones) | #334365 | 0.010 |
| Tritanopia (no blue cones) | #2C4A50 | 0.054 |
| Achromatopsia (no color) | #454545 | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A4366
#3A4366
oklch(39.1% 0.061 272.3)
- #51441B
#51441B
oklch(39.1% 0.061 91.8)
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 #3A4366, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.033
- Charcoal #264653 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.056
- Charcoal Grey #3C4142 ΔE 0.061
- Light Navy #155084 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.062
- Dark Slate Gray #2F4F4F ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.066
Use #3A4366 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.