#3B6ECB
Closest named color: Windows Blue (#3778BF). oklch(55.2% 0.155 261.3), rgb(59, 110, 203).
Aa
White text reads best on this color (4.90:1).
About this color
#3B6ECB is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.155 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.036 away. White text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.27:1 |
| White text | 4.90:1 |
Values
| HEX | #3B6ECB |
| RGB | rgb(59, 110, 203) |
| HSL | hsl(219, 58%, 51%) |
| OKLCH | oklch(55.2% 0.155 261.3) |
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 #3B6ECB | 4.90:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #3B6ECB | 4.27:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #3B6ECB text on white | 4.90:1 | AA | Lc 73.7 | Content text, not long reading |
| #3B6ECB text on black | 4.27:1 | AA large text | Lc -28.0 | 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
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CBDAF3
oklch(88.5% 0.038 260.7)
-
Step 300
300
#A8C2EE
oklch(81% 0.069 260.9)
-
Step 400
400
#79A1E6
oklch(70.8% 0.111 260.9)
-
Step 500
500
#5787DF
oklch(63.1% 0.143 261.6)
-
Step 600
600 (this color)
#3B6ECB
oklch(55.2% 0.155 261.3)
-
Step 700
700
#2E5DB1
oklch(49.2% 0.143 261)
-
Step 800
800
#274C8F
oklch(42.7% 0.119 261.2)
-
Step 900
900
#244072
oklch(37.7% 0.092 261.1)
-
Step 950
950
#162643
oklch(27.1% 0.058 261.5)
#3B6ECB 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) | #3E78CF | 0.027 |
| Deuteranopia (no green cones) | #206AC9 | 0.024 |
| Tritanopia (no blue cones) | #008492 | 0.125 |
| Achromatopsia (no color) | #717171 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B6ECB
#3B6ECB
oklch(55.2% 0.155 261.3)
- #946A00
#946A00
oklch(55.3% 0.114 81.2)
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 #3B6ECB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.036
- Royal Blue #4169E1 ΔE 0.038
- Mid Blue #276AB3 ΔE 0.043
- French Blue #436BAD ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.058
- Flat Blue #3C73A8 ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.061
- Nice Blue #107AB0 ΔE 0.063
Use #3B6ECB 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.