pxtoem.net is described as 'CSS units converter, convert pixels to EMs, points, percents. Tools for creating scalable and accessible CSS' and is an website in the Development category. There are five alternatives to pxtoem.net, not only websites but also apps for Self-Hosted solutions, Mac, Windows and Linux. The best alternative is Bootstrap Studio. It's not free, so if you're looking for a free alternative, you could try Layoutit or BuildBootstrap. Other great sites and apps similar to pxtoem.net are Pretty Checkbox (Free, Open Source) and PixelConverter (Free).
Bootstrap Studio is an elegant and very easy to use web design tool for building websites using the renowned Bootstrap framework. With its intuitive, drag-and-drop interface, new users can easily get great designs in just moments.
Layoutit is a drag&drop page layout builder that outputs Bootstrap 3 code. It supports: * Bootstrap grid elements * CSS enhancements of fundamental HTML elements (list, table, form etc.) * components (button group, thumbnail, panel etc.