CollabSpace: Real-Time Collaborative Workspace
A real-time collaborative document platform featuring fine-grained multi-user presence, colored live cursors and selections, conflict-free…
A real-time collaborative document platform featuring fine-grained multi-user presence, colored live cursors and selections, conflict-free Operational Transformation (OT) synchronization that eliminates simultaneous edit collisions and multiplayer data loss, point-in-time version history timeline with instant rollback, threaded inline discussions, offline resilience with reconnect buffer reconciliation, and role-based permissions (Viewer, Editor, Owner).
- 1:1 pixel-accurate layout matching reference design with three-column workspace, floating typing indicator, version scrubber, and threaded comments
- Operational Transformation (OT) engine preventing multiplayer data loss and character collisions during simultaneous edits
- Interactive OT Conflict Battle Simulator demonstrating transform matrices T(Op_B, Op_A) and comparing against naive Last-Write-Wins
- Live presence and awareness with collaborator avatars, colored cursor flags, and dynamic selection highlights (Sarah, James, Maya, You, Alex)
- Point-in-time version history timeline (v1 to v8) with change metrics (edits, comments, sections) and 1-click restore
- Threaded inline annotations with text anchors, margin badges, and resolve/reopen capabilities
- Cross-tab real-time multi-user communication via BroadcastChannel API and localStorage
- Complete Supabase PostgreSQL schema with append-only operation log, row-level locks, PL/pgSQL transform procedures, and Realtime publication
Built with: Collaborative Editor, Operational Transformation (OT), Conflict Resolution Engine, Multi-User Presence, Live Cursors & Selections, BroadcastChannel & WebSockets, Version History Timeline, Threaded Inline Comments, Role-Based Access Control, Offline Buffer Reconciliation, Supabase / PostgreSQL Schema, PL/pgSQL apply_document_operation(), HTML5 / CSS3 / Vanilla JS, Google Fonts (Sora, Outfit, Chivo Mono)