#3566C9
Closest named color: Mid Blue (#276AB3). oklch(53.1% 0.163 262.5), rgb(53, 102, 201).
Aa
White text reads best on this color (5.39:1).
About this color
#3566C9 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.163 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.039 away. White text reads best on it, at 5.39:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.89:1 |
| White text | 5.39:1 |
Values
| HEX | #3566C9 |
| RGB | rgb(53, 102, 201) |
| HSL | hsl(220, 58%, 50%) |
| OKLCH | oklch(53.1% 0.163 262.5) |
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 #3566C9 | 5.39:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #3566C9 | 3.89:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #3566C9 text on white | 5.39:1 | AA | Lc 76.5 | Fine for body text |
| #3566C9 text on black | 3.89:1 | AA large text | Lc -25.3 | 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
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A7C1F1
oklch(80.8% 0.074 262.5)
-
Step 400
400
#79A0EA
oklch(70.8% 0.117 262.5)
-
Step 500
500
#5686E3
oklch(63% 0.15 262.3)
-
Step 600
600 (this color)
#3566C9
oklch(53.1% 0.163 262.5)
-
Step 700
700
#2E5BB5
oklch(49% 0.151 262.3)
-
Step 800
800
#274B93
oklch(42.7% 0.126 262.4)
-
Step 900
900
#243F75
oklch(37.7% 0.098 262.6)
-
Step 950
950
#152544
oklch(26.8% 0.062 262.4)
#3566C9 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) | #2C71CD | 0.028 |
| Deuteranopia (no green cones) | #0064C7 | 0.028 |
| Tritanopia (no blue cones) | #007E8E | 0.130 |
| Achromatopsia (no color) | #6A6A6A | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3566C9
#3566C9
oklch(53.1% 0.163 262.5)
- #8B6500
#8B6500
oklch(53.2% 0.109 82.7)
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 #3566C9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.039
- Royal Blue #4169E1 ΔE 0.040
- French Blue #436BAD ΔE 0.050
- Warm Blue #4B57DB ΔE 0.050
- Windows Blue #3778BF ΔE 0.054
- Iris #6258C4 ΔE 0.060
- Cerulean Blue #056EEE ΔE 0.060
- Neon Blue #4361EE ΔE 0.060
Use #3566C9 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.