Crystal: Multi-Session AI Code Manager

What it does

Run multiple Codex and Claude Code AI sessions in parallel git worktrees. Test, compare approaches & manage AI-assisted development workflows in one desktop app. Crystal is open source and supported by a growing community of developers.

Crystal pioneered multi-session Claude Code. Nimbalyst is the successor: a full visual workspace with kanban, worktrees, and inline AI diffs.

Crystal was the first GUI for managing multiple Claude Code sessions in parallel. Nimbalyst is the direct successor: same idea, more tools, and it works for both Claude Code and Codex. Every Crystal feature is here, plus a session kanban, visual editors for markdown, mockups, and diagrams, and an iOS companion app. Free for individuals. Works with your existing Claude Code or Codex subscription or API key. Crystal started as an internal tool to manage parallel Claude Code sessions with git worktrees. It worked so well we shipped it publicly and called it the first Integrated Vibe Environment (IVE). Nimbalyst is what that idea grew into: a full visual workspace for building with Claude Code…from nimbalyst.com

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