#3166B3
Closest named color: Mid Blue (#276AB3). oklch(51.4% 0.135 258), rgb(49, 102, 179).
Aa
White text reads best on this color (5.70:1).
About this color
#3166B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.135 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.012 away. White text reads best on it, at 5.70:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.68:1 |
| White text | 5.70:1 |
Values
| HEX | #3166B3 |
| RGB | rgb(49, 102, 179) |
| HSL | hsl(216, 57%, 45%) |
| OKLCH | oklch(51.4% 0.135 258) |
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 #3166B3 | 5.70:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #3166B3 | 3.68:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #3166B3 text on white | 5.70:1 | AA | Lc 78.2 | Fine for body text |
| #3166B3 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
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A7C2EB
oklch(80.8% 0.065 258.6)
-
Step 400
400
#77A2E1
oklch(70.6% 0.104 257.8)
-
Step 500
500
#548AD9
oklch(63.2% 0.133 257.9)
-
Step 600
600
#3872C6
oklch(55.6% 0.144 257.9)
-
Step 700
700 (this color)
#3166B3
oklch(51.4% 0.135 258)
-
Step 800
800
#244E8B
oklch(42.7% 0.112 258)
-
Step 900
900
#22416F
oklch(37.6% 0.087 258.2)
-
Step 950
950
#152741
oklch(27.2% 0.054 257.6)
#3166B3 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) | #416DB6 | 0.027 |
| Deuteranopia (no green cones) | #2A61B1 | 0.016 |
| Tritanopia (no blue cones) | #007884 | 0.105 |
| Achromatopsia (no color) | #666666 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3166B3
#3166B3
oklch(51.4% 0.135 258)
- #895E00
#895E00
oklch(51.5% 0.107 77.6)
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 #3166B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.012
- French Blue #436BAD ΔE 0.026
- Flat Blue #3C73A8 ΔE 0.046
- Muted Blue #3B719F ΔE 0.051
- Dusky Blue #475F94 ΔE 0.052
- Windows Blue #3778BF ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.056
- Peacock Blue #016795 ΔE 0.057
Use #3166B3 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.