Aizen

Aizen is an open-source, native macOS workspace designed for parallel development workflows. Built specifically for Apple Silicon, it enables developers to manage multiple projects or branches simultaneously, keeping each environment distinct with its own state. The platform is aimed at users who need to coordinate terminals, editors, browser tabs, code review, and AI agent workflows across various development contexts without losing track of their progress.

Key features of Aizen include the ability to run multiple agents such as Claude, Codex, Gemini, and other ACP agents directly within the workspace. Users can also add MCP servers from a built-in marketplace. Each environment can host terminal panes powered by a GPU-accelerated terminal (using libghostty), file tabs, browser tabs, and chat history. The terminal supports split panes, themes, presets, and optional tmux persistence for session continuity. The tool integrates Git functionalities, allowing users to stage, commit, diff, review pull requests, and monitor CI runs from GitHub Actions or GitLab CI without leaving the workspace. Xcode integration and a CLI companion are also available.

Aizen emphasizes native performance and integration on macOS, utilizing GPU acceleration and Metal rendering for its terminal, and providing voice input and attachments. Project and workspace management tools let users group active projects, create environments for specific branches or tasks, and keep everything organized in one application. The platform is particularly useful for developers engaged in agent workflows, parallel development, code review, and project management tasks.

0 license, with its source code publicly available. Pricing is structured into Free, Pro, and Lifetime tiers. The core app, including unlimited workspaces, agent support, GPU terminal, file and web browser, visual Git diff and review, and CI integration, is free to use. Pro and Lifetime plans offer additional benefits such as priority support, future paid extras, and support for ongoing development, with Pro available as a monthly or yearly subscription and Lifetime as a one-time purchase. , Limited.