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Pi vs Character.AI: catalog facts
Pi	Character.AI
Free Sign-up is free; the research does not mention paid plans.	Freemium Free to start; check the site for current plan details.
Web	Web
Conversational tone suited to talking things through Runs in the browser with nothing to install	Large catalogue of user-made characters Supports custom personas
Can make factual mistakes Aimed at conversation more than research or coding work	Built for entertainment rather than factual answers Plan details were not confirmed
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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