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Building a Local-First Collaborative Spreadsheet with Yjs, SQLite, and WebSockets

Master local-first engineering. Build an offline-capable, collaborative spreadsheet using Yjs CRDT arrays and SQLite client-side storage.

Sachin Sharma
Sachin SharmaCreator
Jun 1, 2026
4 min read
Building a Local-First Collaborative Spreadsheet with Yjs, SQLite, and WebSockets
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Master local-first engineering. Build an offline-capable, collaborative spreadsheet using Yjs CRDT arrays and SQLite client-side storage.

YjsCRDTsSQLiteLocal-FirstWebSocketsCollaborationState Management
Sachin Sharma

Sachin Sharma

Software Developer

Building digital experiences at the intersection of design and code. Sharing weekly insights on engineering, productivity, and the future of tech.

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