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Re:ChatPDF – Chat with Any PDF by derwiki on Wednesday April 19, 2023 @09:55AM (#35628166)
This seems vault-ai based which has instructions to self-host:

http://github.com/pashpashpash/vault-ai

Re:ChatPDF – Chat with Any PDF by rolisz on Wednesday April 19, 2023 @12:08PM (#35629914)
Vault still uses Pinecone as a 3rd party service and your embeddings do get sent there.