#3366B6
Closest named color: Mid Blue (#276AB3). oklch(51.7% 0.138 259.1), rgb(51, 102, 182).
Aa
White text reads best on this color (5.65:1).
About this color
#3366B6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.138 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.015 away. White text reads best on it, at 5.65:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #3366B6 |
| RGB | rgb(51, 102, 182) |
| HSL | hsl(217, 56%, 46%) |
| OKLCH | oklch(51.7% 0.138 259.1) |
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 #3366B6 | 5.65:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #3366B6 | 3.71:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #3366B6 text on white | 5.65:1 | AA | Lc 77.9 | Fine for body text |
| #3366B6 text on black | 3.71:1 | AA large text | Lc -23.9 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A7C2EC
oklch(80.8% 0.067 259.1)
-
Step 400
400
#78A2E3
oklch(70.8% 0.106 258.9)
-
Step 500
500
#5589DB
oklch(63.2% 0.136 259.2)
-
Step 600
600
#3971C9
oklch(55.6% 0.149 259.2)
-
Step 700
700 (this color)
#3366B6
oklch(51.7% 0.138 259.1)
-
Step 800
800
#254D8C
oklch(42.6% 0.114 259.2)
-
Step 900
900
#234170
oklch(37.7% 0.088 259.1)
-
Step 950
950
#152642
oklch(27% 0.057 259.9)
#3366B6 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) | #3F6EB9 | 0.027 |
| Deuteranopia (no green cones) | #2761B4 | 0.018 |
| Tritanopia (no blue cones) | #007985 | 0.110 |
| Achromatopsia (no color) | #676767 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3366B6
#3366B6
oklch(51.7% 0.138 259.1)
- #895F00
#895F00
oklch(51.7% 0.108 78.6)
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 #3366B6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.015
- French Blue #436BAD ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.048
- Windows Blue #3778BF ΔE 0.051
- Muted Blue #3B719F ΔE 0.054
- Dusky Blue #475F94 ΔE 0.056
- Nice Blue #107AB0 ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.060
Use #3366B6 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.