Swift. AppKit. No Electron. Coding agents in a native Mac app

Swift. AppKit. No Electron.

I built Coincide as a native Mac app for the coding agents I already use. Here is a new 10-second motion preview:

A Mac interface built with Swift and AppKit

Coincide's main interface is built with AppKit, with SwiftUI where it fits, such as Settings. It brings native menus, Mac keyboard shortcuts, a native transcript and the agent/model picker into one window.

The clip calls out the architecture: Swift. AppKit. No Electron. That describes Coincide's Mac interface. It isn't a benchmark or a claim that every workload is faster than another app.

Different agents, one conversation

Claude Code, Codex, Cursor, Grok Build, OpenCode and Antigravity each run through their own command-line tool and existing login. Coincide does not sell or meter tokens.

When you switch agents mid-thread, the next agent gets a recap of the turns it missed and works in the same directory. Each agent keeps its own native session. Switching back resumes that agent's session. The handoff deep dive covers the mechanism and its limits.

The preview browses Codex, Claude Code and Cursor's picker catalogs. Available models depend on the agents installed and the provider account you use.

About the footage

This is an edited illustrative demo: the conversation text was replaced with generic content for privacy, while the picker panels were captured from Coincide. It is not a fresh live handoff recording or simultaneous agent execution. The motion design and synthesized sound are original.

Download Coincide · Source code (MIT) · Original blog post