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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Dont care about the math? Cool I don't really either but I needed to understand it to write this purrfect [Divvy Calculator](https://divvy.codingcat.dev/). See something broken, PR's more than welcome. [GitHub Repo](https://github.com/CodingCatDev/divvy-screen-size)
What I wanted to do was create a simple tool that would calculate what to set Divvy's margins to so that I can capture my screen correctly for recording both at Builder.io and CodingCat.dev.