#3366B2
Closest named color: Mid Blue (#276AB3). oklch(51.5% 0.133 258.3), rgb(51, 102, 178).
Aa
White text reads best on this color (5.70:1).
About this color
#3366B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.133 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.013 away. White text reads best on it, at 5.70:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.68:1 |
| White text | 5.70:1 |
Values
| HEX | #3366B2 |
| RGB | rgb(51, 102, 178) |
| HSL | hsl(216, 55%, 45%) |
| OKLCH | oklch(51.5% 0.133 258.3) |
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 #3366B2 | 5.70:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #3366B2 | 3.68:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #3366B2 text on white | 5.70:1 | AA | Lc 78.2 | Fine for body text |
| #3366B2 text on black | 3.68:1 | AA large text | Lc -23.6 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EAF7
oklch(93.5% 0.02 260.2)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A8C2EB
oklch(80.9% 0.065 259.4)
-
Step 400
400
#79A2E0
oklch(70.7% 0.102 258.5)
-
Step 500
500
#5589D8
oklch(63% 0.132 258.5)
-
Step 600
600
#3A72C5
oklch(55.6% 0.142 258.2)
-
Step 700
700 (this color)
#3366B2
oklch(51.5% 0.133 258.3)
-
Step 800
800
#264E8A
oklch(42.7% 0.11 258.4)
-
Step 900
900
#23416E
oklch(37.6% 0.085 258.3)
-
Step 950
950
#152641
oklch(26.9% 0.056 259.3)
#3366B2 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) | #426DB5 | 0.026 |
| Deuteranopia (no green cones) | #2C61B0 | 0.016 |
| Tritanopia (no blue cones) | #007883 | 0.106 |
| Achromatopsia (no color) | #666666 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3366B2
#3366B2
oklch(51.5% 0.133 258.3)
- #885E00
#885E00
oklch(51.3% 0.107 78.3)
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 #3366B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.013
- French Blue #436BAD ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.045
- Muted Blue #3B719F ΔE 0.049
- Dusky Blue #475F94 ΔE 0.050
- Windows Blue #3778BF ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.055
- Peacock Blue #016795 ΔE 0.056
Use #3366B2 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.