Aizen

Aizen is a native macOS workspace for parallel development, where AI agents, terminals, files and browsers run side by side across every project and branch. Each project or branch gets its own environment with terminal panes, file tabs, browser tabs and chat history, so developers can switch between tasks without losing their place. It is built for developers who run several coding agents at once and want them in one app. It runs Claude, Codex, OpenCode, Gemini and other agents that speak the Agent Client Protocol, with MCP servers added per agent from a built in marketplace. The terminal is GPU accelerated, built on libghostty with Metal rendering, split panes, presets, themes and optional tmux persistence. Git staging, commits, diffs and pull request review sit alongside GitHub Actions and GitLab CI runs, and the app adds voice input, attachments, Xcode integration and a CLI companion. Projects can be grouped into workspaces with environments for the branches that are active. Pricing is published in three tiers. Free costs $0 and includes the full core workspace with unlimited workspaces and worktrees. Pro is $5.99 per month or $59 per year and adds priority support and future paid extras while funding development, with a 30 day money back guarantee. Lifetime is a one time purchase of $179 with the same benefits and priority support for life. Aizen is open source under the GPL 3.0 license, and it currently runs only on Macs with Apple Silicon.