Polypane

This thing is FAST and the synchronized scrolling works amazingly. Prepare to be impressed. Vivian Guillen - Frontend Dev, Curator at Tailwind Weekly
Polypane is really saving my bacon. Kilian knocked it out of the park, this is my new favorite development tool. Scott Tolinski - Syntax.fm host, Level Up Tutorials
I've started playing around with Polypane and 🤯. It has awesome debugging tools, I'm really impressed. Kevin Powell - CSS Evangelist

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