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T3 Chat vs Big-AGI: catalog facts
T3 Chat	Big-AGI
Freemium Plans are not shown on the homepage; check the site for current pricing.	Freemium Open-source version is free; a Pro subscription costs $10.99 per month.
Web	Web, Self-hosted
Many models from different providers in one app Thread search and file attachments	Works with many cloud providers and local model servers Beam compares and merges answers from several models
Web only Pricing details are not published on the homepage	Cloud models require your own paid API keys Some features are part of the paid Pro tier
Web application	Web application, Self-hosted
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
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.