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bb vs Emdash: catalog facts
bb	Emdash
Free Free and described as fully open source; the agents it drives may have their own costs.	Free Free and open source; the coding agents you connect may have their own costs.
macOS, Linux, Command line	Windows, macOS, Linux
Works with many coding agents from one interface Runs tasks in isolated Git worktrees	Runs several coding agents in parallel in isolated Git worktrees Works with many agents rather than locking you to one
No native Windows build; Windows needs WSL Relies on external agents and their subscriptions or API keys	Needs separately installed and paid-for coding agents to do the actual work Young product that is still changing quickly
Downloadable app	Downloadable app
Open source	Open source
License not stated	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 1, 2026

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