Coterm vs Duckly

Coterm is a native macOS workspace for two developers sharing a terminal, browser, and coding-agent session in real time. A live room lets both people join, follow terminal activity, see participants, and share previews. The shared workflow lists Claude Code, Codex, OpenCode, Gemini CLI, Aider, Amp, Cursor Agent, and other CLI agents. Coterm uses a Ghostty-based terminal with vertical tabs, a notification panel, and a socket control API. A CLI and Unix socket expose programmatic commands, while integration hooks can be configured for Claude Code, Amp, Cursor, Gemini, and Kiro CLI. The Mac app runs locally without a Coterm-hosted account service. Collaboration components can run in the user's Cloudflare account. Installation is available through DMG or Homebrew on macOS 14.0 or later, for Apple Silicon and Intel. An iOS companion is in beta. Coterm is free under GPL-3.0-or-later.

Duckly is an IDE plugin for real-time collaboration between developers using different development environments. Multiple developers can work in the same file through shared code, while audio, video, screen sharing, chat, and terminal sharing run alongside the IDE. Terminal integration installs through npm, and write access can be enabled with the `duckly share --w` command. Listed editors include VS Code, VS Codium, and IntelliJ-based tools such as WebStorm, PyCharm, PhpStorm, CLion, Rider, RubyMine, AppCode, Android Studio, DataGrip, and GoLand; a Chrome extension is also listed. Duckly says IDE files are shared peer-to-peer with end-to-end encryption and do not pass through its servers. Calls and chat with four or fewer participants use peer-to-peer end-to-end encryption; with a fifth participant, calls switch to cloud infrastructure. The Free plan costs nothing and allows two participants without video calls. Hacker costs $6 a month for three participants; Team costs $10 per member per month for up to 60.