#3B66C2
Closest named color: Mid Blue (#276AB3). oklch(52.9% 0.152 263.3), rgb(59, 102, 194).
Aa
White text reads best on this color (5.43:1).
About this color
#3B66C2 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.152 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.032 away. White text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.86:1 |
| White text | 5.43:1 |
Values
| HEX | #3B66C2 |
| RGB | rgb(59, 102, 194) |
| HSL | hsl(221, 53%, 50%) |
| OKLCH | oklch(52.9% 0.152 263.3) |
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 #3B66C2 | 5.43:1 | AA | Lc -82.1 | Fine for body text |
| Black text on #3B66C2 | 3.86:1 | AA large text | Lc 27.3 | Dividers and decoration only |
| #3B66C2 text on white | 5.43:1 | AA | Lc 76.8 | Fine for body text |
| #3B66C2 text on black | 3.86:1 | AA large text | Lc -25.0 | 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 600.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#AAC1EE
oklch(80.9% 0.069 263.7)
-
Step 400
400
#7DA0E5
oklch(70.8% 0.109 263.3)
-
Step 500
500
#5C86DD
oklch(63% 0.14 263.5)
-
Step 600
600 (this color)
#3B66C2
oklch(52.9% 0.152 263.3)
-
Step 700
700
#345CB0
oklch(49.2% 0.141 263.1)
-
Step 800
800
#2C4B8E
oklch(42.6% 0.117 263.5)
-
Step 900
900
#273F72
oklch(37.6% 0.092 263.6)
-
Step 950
950
#172542
oklch(26.8% 0.058 263.5)
#3B66C2 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) | #3570C5 | 0.026 |
| Deuteranopia (no green cones) | #1564C0 | 0.028 |
| Tritanopia (no blue cones) | #007C8A | 0.124 |
| Achromatopsia (no color) | #6A6A6A | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B66C2
#3B66C2
oklch(52.9% 0.152 263.3)
- #896500
#896500
oklch(52.9% 0.109 84)
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 #3B66C2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.032
- French Blue #436BAD ΔE 0.039
- Royal Blue #4169E1 ΔE 0.049
- Windows Blue #3778BF ΔE 0.050
- Iris #6258C4 ΔE 0.056
- Warm Blue #4B57DB ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.060
- Dark Periwinkle #665FD1 ΔE 0.060
Use #3B66C2 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.