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PaperQA2 vs Khoj: catalog facts
PaperQA2	Khoj
Free Free and open source under the Apache 2.0 licence; model API usage may cost extra.	Freemium Free to self-host; the hosted service has free and paid plans.
Command line	Web, Self-hosted
Answers include citations to the source documents Fetches paper metadata with citation counts and retraction checks	Searches and chats over your own documents Works with local or remote language models
Needs a language model, either through an API or run locally Setup and tuning assume comfort with Python	Self-hosting takes some setup work The company now spreads its effort across several products
Downloadable app	Web application, Self-hosted, Hosted service
Open source	Open source
License: Apache-2.0	License: AGPL-3.0
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 September 23, 2026

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