I will demo Google Docs-style collaborative apps that communicate entirely through Matrix. This means they inherit Matrix's nice properties, including E2EE, decentralization, and user control.

Under the hood, the apps use Collabs, a TypeScript library I'm developing. Collabs provides collaborative data structures - specifically CRDTs. These are classes that have APIs like ordinary data structures (Map, Array, etc.) but also automatically sync between clients, guaranteeing eventual consistency. I will briefly describe the unique features of Collabs and show what it's like to program an app using the library.