This article details the 18-month development journey of the project management application Fizzy, highlighting key commits and name changes along the way. It captures the iterative process of design and coding, including major contributions from David Heinemeier Hansson and the philosophical shifts in the codebase.

Crystal is a tool that allows developers to create isolated sessions for AI-assisted programming using Claude Code or Codex, enabling iterative development with git integration. It supports features like session management, commit history tracking, and cloud provider configuration for deployment. Users can easily set up and run Crystal on macOS and Windows through local builds and can contribute to the project following the provided guidelines.