#3B4570
Closest named color: Dark Grey Blue (#29465B). oklch(40.2% 0.074 272.8), rgb(59, 69, 112).
Aa
White text reads best on this color (9.24:1).
About this color
#3B4570 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.074 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.046 away. White text reads best on it, at 9.24:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.27:1 |
| White text | 9.24:1 |
Values
| HEX | #3B4570 |
| RGB | rgb(59, 69, 112) |
| HSL | hsl(229, 31%, 34%) |
| OKLCH | oklch(40.2% 0.074 272.8) |
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 #3B4570 | 9.24:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #3B4570 | 2.27:1 | Fails | Lc 12.7 | Not readable |
| #3B4570 text on white | 9.24:1 | AAA | Lc 91.3 | Preferred for body text |
| #3B4570 text on black | 2.27:1 | Fails | Lc -11.1 | 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 800.
-
Step 50
50
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F2
oklch(93.5% 0.012 276.1)
-
Step 200
200
#D3D8E9
oklch(88.4% 0.024 272.8)
-
Step 300
300
#B7BFDD
oklch(80.8% 0.043 273.6)
-
Step 400
400
#929ECC
oklch(70.6% 0.069 273.2)
-
Step 500
500
#7786BF
oklch(63.1% 0.088 272.4)
-
Step 600
600
#616FAB
oklch(55.6% 0.095 273)
-
Step 700
700
#505D93
oklch(49.2% 0.088 272.5)
-
Step 800
800 (this color)
#3B4570
oklch(40.2% 0.074 272.8)
-
Step 900
900
#373F60
oklch(37.6% 0.058 272.9)
-
Step 950
950
#202538
oklch(26.9% 0.036 272.4)
#3B4570 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) | #354A72 | 0.016 |
| Deuteranopia (no green cones) | #31456F | 0.014 |
| Tritanopia (no blue cones) | #284E55 | 0.066 |
| Achromatopsia (no color) | #474747 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B4570
#3B4570
oklch(40.2% 0.074 272.8)
- #564710
#564710
oklch(40.3% 0.074 93.1)
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 #3B4570, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.046
- Light Navy #155084 ΔE 0.051
- Twilight Blue #0A437A ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.057
- Dusk Blue #26538D ΔE 0.058
- Cobalt #1E488F ΔE 0.058
- Dusk #4E5481 ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.059
Use #3B4570 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.