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b2 vs BeebEm: catalog facts
b2	BeebEm
Free Free to download from GitHub.	Free Free, with source code on GitHub.
Windows, macOS, Linux	Windows
Covers several Acorn BBC models and the Olivetti PC 128 S Runs on Windows, macOS and Linux	Emulates both the BBC Micro and Master Series Disc drive and tape relay sound effects
Limited to BBC Micro family machines Documentation lives mainly in the repository	Windows only The research does not show recent release dates
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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