One of the largest CRDT deployments at Notion

Notion overhauled its collaborative architecture by moving away from a last-write-wins system to a more robust CRDT framework. By utilizing a Replicated Growable Array, the platform ensures that simultaneous edits from multiple users are merged deterministically without losing data. The authors explain how this technology handles rich text formatting and complex block-based document structures through innovative concepts like text slices and search labels. These specialized tools allow the system to track moving content across different database records while maintaining performance efficiency. Ultimately, this technical transition serves as a critical foundation for offline editing and modern team collaboration at a massive scale.