Polypane 2.1 introduces several major features for web developers: a Live CSS panel that applies CSS/SCSS edits across all viewport panes simultaneously with Google Fonts support, a Meta Information panel showing all head tags and social media card previews (Twitter, Facebook, LinkedIn, Slack) with pixel-accurate rendering, a Handoff/Browse panel for integrating design tools like Avocode and Zeplin, and a visual Workspaces panel for managing pane sets. Additional improvements include new accessibility overlays (Z-index, Glaucoma, Cataracts, Night mode), network throttling for realistic device testing, performance improvements to scroll syncing, and screenshot enhancements. Minor updates in 2.1.1 and 2.1.2 add Variable Fonts support, Svelte DevTools, and various fixes.
