Matrix-CRDT – real-time collaborative apps using Matrix as backend
Hi HN! Matrix-CRDT connects the worlds of Yjs [1] (a proven, high performance CRDT) with that of Matrix.org [2]. It started as an experiment, asking myself; can we store "state updates of a datastore" in Matrix instead of chat messages? Now, I'm convinced it's actually a really powerful combination to develop real-time, collaborative software. I'm using it for a new project and so far didn't have to write a backend yet. Matrix takes care of a lot of stuff: Authentication, E2EE, federation, hosting, etc. - so I can focus on the client. I love the ideas of Local First [3] software. Personally,…
Matrix-CRDT – real-time collaborative apps using Matrix as backend launched on January 18, 2022 with 320 votes, #50 of 2,891 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 4 years on.
In plain words
Matrix-CRDT is a library that combines Yjs, a collaborative data structure technology, with Matrix.org to build real-time collaborative applications. It stores data state updates in Matrix instead of traditional backends, handling authentication, encryption, federation, and hosting automatically. The tool is designed for developers building local-first software who want to focus on client-side development without managing separate backend infrastructure.
written from the facts on this page · September 2026
From the sources
Use Matrix as a backend for local-first applications with the Matrix-CRDT Yjs provider. - YousefED/Matrix-CRDT
In the maker’s words, at launch
Hi HN! Matrix-CRDT connects the worlds of Yjs [1] (a proven, high performance CRDT) with that of Matrix.org [2]. It started as an experiment, asking myself; can we store "state updates of a datastore" in Matrix instead of chat messages? Now, I'm convinced it's actually a really powerful combination to develop…
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