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ThinkRail vs bb: catalog facts
ThinkRail	bb
Free Free and open source under the Apache-2.0 licence.	Free Free and described as fully open source; the agents it drives may have their own costs.
Windows, macOS, Linux	macOS, Linux, Command line
Each workspace is an isolated git worktree with its own branch and terminals Concurrent agent chats alongside Monaco editor tabs and diffs	Works with many coding agents from one interface Runs tasks in isolated Git worktrees
Built specifically for the pi coding agent macOS build is for Apple Silicon only and the Linux build targets Ubuntu 24.04 or later	No native Windows build; Windows needs WSL Relies on external agents and their subscriptions or API keys
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.