Crush is made by Charmbracelet - the people whose libraries sit under the interfaces of a good half of today's console programs. Hence the first thing you notice: this is the best-dressed terminal agent in existence. Its own description says as much - glamourous agentic coding for all.
But something else is more interesting. Where Aider builds a repository map from a parse tree and Cline leans on a shared engine, Crush connects to a language server - the same one that gives you hints in your editor. The feature list puts it plainly: Crush uses LSPs for additional context, just like you do.
It is written in Go, appeared on 21 May 2025, and as of 25 August 2026 has 27,669 stars and version 0.91.0. The project is highly active: a release every few days, with the last commit landing the day this was written.
The Licence Is Not Open, but It Will Be
This needs knowing before installing, because the repository carries no licence badge on GitHub.
The licence is the Functional Source License version 1.1 with an MIT future, abbreviated FSL-1.1-MIT. You may use, copy, modify, create derivative works from and redistribute the software - for any purpose but one.
The forbidden purpose is called a competing use: making the software available to others in a commercial product or service that substitutes for the software itself, substitutes for any other product or service the authors already offer using it, or offers the same or substantially similar functionality.
What is permitted is listed explicitly: internal use, non-commercial education, non-commercial research, and professional services you provide to someone who is themselves using the software under the same terms.
And the most important part - the future licence clause. The authors irrevocably grant an additional MIT licence, effective on the second anniversary of the date a given version was made available. So every version becomes plain MIT after two years.
The practical conclusion: using it in your own work, including commercial work, is fine. Building a competing product on it is not, until that version turns two.