#3566FB
Closest named color: Bright Blue (#0165FC). oklch(57% 0.228 265.5), rgb(53, 102, 251).
Aa
White text reads best on this color (4.72:1).
About this color
#3566FB is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.228 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Blue (#0165FC), ΔE 0.024 away. White text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.228) |
| Temperature | cool |
| Nearest name | Bright Blue (#0165FC) |
| Black text | 4.44:1 |
| White text | 4.72:1 |
Values
| HEX | #3566FB |
| RGB | rgb(53, 102, 251) |
| HSL | hsl(225, 96%, 60%) |
| OKLCH | oklch(57% 0.228 265.5) |
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 #3566FB | 4.72:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #3566FB | 4.44:1 | AA large text | Lc 32.0 | Non-text elements, placeholder text |
| #3566FB text on white | 4.72:1 | AA | Lc 72.1 | Content text, not long reading |
| #3566FB text on black | 4.44:1 | AA large text | Lc -29.6 | 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 600.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#4F7FFF
oklch(63.1% 0.197 265.6)
-
Step 600
600 (this color)
#3566FB
oklch(57% 0.228 265.5)
-
Step 700
700
#254FD6
oklch(49% 0.212 265.4)
-
Step 800
800
#1F42AD
oklch(42.7% 0.176 265.4)
-
Step 900
900
#1E3A89
oklch(37.8% 0.136 265.4)
-
Step 950
950
#122350
oklch(27.1% 0.086 265.4)
#3566FB 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) | #007DFF | 0.053 |
| Deuteranopia (no green cones) | #006AF8 | 0.023 |
| Tritanopia (no blue cones) | #008CA7 | 0.177 |
| Achromatopsia (no color) | #737373 | 0.229 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3566FB
#3566FB
oklch(57% 0.228 265.5)
- #967100
#967100
oklch(57% 0.117 85.7)
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 #3566FB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Blue #0165FC ΔE 0.024
- Neon Blue #4361EE ΔE 0.024
- Cerulean Blue #056EEE ΔE 0.033
- Azul #1D5DEC ΔE 0.038
- Royal Blue #4169E1 ΔE 0.041
- Clear Blue #247AFD ΔE 0.046
- Electric Blue #0652FF ΔE 0.054
- Warm Blue #4B57DB ΔE 0.060
Use #3566FB 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.