by Pixy Puala on WordPress.org
Adds a persistent diff viewer to the Block Editor sidebar, showing live changes against the last saved revision with per-block highlights.

Sidebar panel showing block/paragraph diffs
Sidebar Diff brings revision comparisons directly into the editor so you don’t have to leave your flow.
Why this isn’t a duplicate: Existing revision/workflow plugins (e.g., PublishPress Revisions) provide queues and separate compare screens. Sidebar Diff embeds an always-visible diff inspector inside the editor sidebar for continuous awareness.
The plugin does not transmit data to third parties, set cookies, or track users. Editor-only scripts run for logged-in users with edit capabilities.