Smartpreview

SmartPreview is a tool that simulates previewing your newsletter on a smartphone device.

The virtual device is 384 pixels wide and features a toggle to alternate between a white and a black device.
Also, when the newsletter is not Responsive it features a toggle that enables you to alternate between a full-width view mode, and a fit-to-screen view mode.

SmartPreview main window
SmartPreview main window
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When the newsletter is fully responsive, the view mode toggle is not visible, since it would have no effect.

Black/white toggle Full-width/Fit-to-width toggle
Black/white toggle Full-width/Fit-to-width toggle
Click to enlarge

See also
Hardware