The artificial intelligence that answers questions about philosophy from the original texts
Every answer cites the passage it comes from, and you can open it and read it in full. Still in beta: it gets things wrong now and then.
Only what the texts say, with the citation beside every claim.
Φιλοσοφία
Ask about any thinker, tradition or idea.
Only primary public-domain sources · verifiable citations · no advice or opinions
SigPhi is an artificial intelligence for philosophy that answers only from original philosophical and religious texts in the public domain. It gives no opinions or advice: it shows you what the works say, and where they say it.
The corpus gathers public-domain editions from Project Gutenberg, Wikisource and the Internet Archive, across dozens of traditions: Greek and modern philosophy, sacred texts, political and religious thought.
Every claim is linked to the exact passage that supports it, and you can read that passage in full in the Library. If the corpus does not cover a question, SigPhi says so instead of making something up.