The best alternatives to OnePager are Elementor, Themeum, and Contents. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of OnePager?
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Elementor is the best FREE WordPress Page Builder, with over 3 million active installs. Create beautiful websites using a simple drag and drop interface.
Find the best WordPress Themes & Plugins here at Themeum. Choose your desired WordPress Template and WordPress Plugin from our collection of Responsive WordPress Themes and highly functional WordPress Plugins.
LayersWP is a Drag & Drop editor developed by the team at Obox Themes, since launch the builder has been acquired by the World's best-ever page builder, Elementor :)