Today we're introducing Delta, a multiplayer environment for coding with agents and reviewing what they build, and we're inviting the first users into our private beta. Delta keeps code and conversations connected, so developers and agents can work together with the full context of how the code came to be. Delta is the second half of a plan we've been executing for years: to build the best place to write code, then make it the best place to talk about code.

To support our collaborative vision, we built Delta DB, which replicates the conversation and the worktree together, in real time, for everyone in a thread. Delta DB works with the git repository you already have. Every edit and conversation is captured between your commits. You can commit and push like you always did, and teammates who never open Delta see a normal git repo. Building Zed made performance and craft an obsession for us, and Delta is built on those same principles.

Delta also connects to third-party agent harnesses, starting with Claude Code. Keep working in the terminal you already use, and your session syncs live into a Delta thread. Share any thread with a link, and your teammate can open it in a browser without installing anything. Delta.dev brings you the same Rust application, compiled to WebAssembly and rendered through WebGL, so your teammate gets the same experience you do.

We built a new application for our new reality. Delta DB's first client became a new application, engineered around its replicated abstractions from day one, with the conversation instead of the editor at the center. The thread is where software happens now, and the interface should reflect it. The first invites to the private beta have gone out today; sign up if you want early access.