Release Notes

v1.0.0-beta.1 May 2026

First public beta of Vesper Mosaic. A new tool in the Vesper suite that loads any URL into three side-by-side panes at mobile, desktop, and tablet widths simultaneously - scrolled and clicked in sync.

This is the first public beta. The core feature set is complete and stable. We're releasing it now to gather real-world feedback before the 1.0.0 release.

Three synced viewports

Load any URL and instantly see it at Mobile (390 x 844), Desktop (1920 x 1080), and Tablet (768 x 1024). All three panes share a single session - log in once and all three are logged in.

Fit and 100% view modes

Fit mode (Cmd+1) scales all three panes to fill your screen so you can see everything at once. 100% mode (Cmd+2) shows each pane at its native pixel width, with horizontal scrolling to pan across them.

Scroll and navigation sync

Scroll in any pane and the other two follow, anchored to the same DOM element with a percentage fallback. Click a link and all three panes navigate together. Back and forward buttons step through navigation history across all panes simultaneously.

Purge cache

One click clears the shared HTTP cache and reloads all three panes - useful when you need to verify you're seeing fresh assets.

Known limitations