I’ve been making improvements to Vale.Rocks using Polypane’s suggestions, which pick up things standard browser dev tools miss.
Also, Portal is awesome for testing across devices.
Polypane also has a celebration button that appears when I fix all accessibility issues, which is an absolute joy.
I have a few minor niggles, but on the whole I’m really liking Polypane.
Regarding those niggles, Kilian Valkhof is absolutely fantastic and extremely receptive to feedback, which is wonderful.