Coincide vs T3 Code: the native Mac port compared

T3 Code calls itself an “agent harness control surface”: it controls the agents on your machine from a desktop app, a web app and mobile apps. Coincide ports T3 Code’s design and behavior, under T3 Code’s MIT license, to a native Mac app. Facts about T3 Code below come from its README, FAQ and remote access guide.

At a glance

	T3 Code	Coincide
Made by	T3 Tools	Apoorv Darshan, porting T3 Code
How it’s built	An “Electron-based desktop app,” a web app and a `t3` server	A native AppKit app, with SwiftUI where it fits, such as Settings
Platforms	macOS, Windows and Linux desktop apps, a web client, and iOS and Android apps	macOS 26 or later, Apple silicon and Intel; an iPhone and iPad companion, Coincide Remote, is coming soon
Agents	Claude Code, Codex, Cursor, Grok Build, OpenCode, Google Antigravity and fx, per its README	Claude Code, Codex, Cursor, Grok Build, OpenCode and Antigravity
License and price	“Free and open source (MIT)”	Free and open source (MIT)
Where agents run	Wherever T3 Code runs: “your desktop, a server, a VPS”	On the Mac where Coincide is installed

Electron and a server, or AppKit

T3 Code’s desktop app is built on Electron, with a Node server behind a web interface; the same server powers its web client and lets other devices connect. Coincide rebuilds the interface with AppKit and drives each agent from native Swift code, with no web server in between, so it uses macOS’s own windows, menus, keyboard shortcuts, accessibility and notifications. Coincide’s source is Swift, built with Xcode and XcodeGen.

Being native also makes room for Mac-specific features: Computer Use for operating other Mac apps, Appshots to attach another app’s window, Keep Awake for MacBooks, dictation with Apple’s on-device speech or a local Whisper model, and a browser that signs in with your Keychain, 1Password or Bitwarden, including Bitwarden passkeys.

Remote access

Remote use is central to T3 Code. Its FAQ says: “Run npx t3 up on that machine and you get really good remote support,” through T3 Connect (a Cloudflare tunnel set up by T3’s relay), LAN pairing or Tailscale, with the web client and phone apps as remotes. Coincide runs on your Mac only. Its iPhone and iPad companion, Coincide Remote, isn’t released yet; it’s designed to connect straight to your Mac over your local network or Tailscale, with no relay server.

Agents

Both apps drive the agents’ own tools with your existing subscriptions. T3 Code’s README also lists fx, which Coincide doesn’t support. In Coincide, each agent has a page describing exactly what works: Claude Code, Codex, Cursor, Grok Build, OpenCode and Antigravity. Switching agents mid-thread gives the next agent a recap of the turns it missed.

Data and telemetry

T3 Code’s FAQ says your code and prompts go from your machine to your provider, not to T3, and that T3 Code sends “basic product usage events” without prompts or file contents, which T3CODE_TELEMETRY_ENABLED=false turns off. Coincide’s own code has no analytics or tracking, and it keeps its data in ~/Library/Application Support/Coincide; the privacy policy lists every connection the app makes.

When T3 Code is the better choice

You work on Windows or Linux, or want a web client.
Your agents run on a server or VPS and you drive them from a laptop or phone.
You want the original project, or agents Coincide doesn’t support, such as fx.

When Coincide is the better choice

You work on a Mac and prefer a native AppKit app.
You want Mac features such as Computer Use, Appshots, Keep Awake and Keychain sign-ins around your agents.
You want turns to keep running after you quit the app; Coincide’s background agent host does this without extra setup.

Checked on November 1, 2026 against T3 Code’s README, FAQ, remote access guide and t3.codes; products change, so check their sites. T3 Code is a product of T3 Tools Inc.; Coincide credits it as the original design but isn’t affiliated with or endorsed by T3 Tools. Agent names are trademarks of their owners.