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Big-AGI vs Arena: catalog facts
Big-AGI	Arena
Freemium Open-source version is free; a Pro subscription costs $10.99 per month.	Free The site shows no paid plan; chatting and voting are open to visitors.
Web, Self-hosted	Web
Works with many cloud providers and local model servers Beam compares and merges answers from several models	Compare answers from different models on the same prompt Public leaderboard built from community votes
Cloud models require your own paid API keys Some features are part of the paid Pro tier	Prompts are sent to third-party AI providers Responses may be inaccurate, as the site itself notes
Web application, Self-hosted	Web application
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 26, 2026

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