PrivateGPT
Production-ready, air-gapped RAG framework for querying your documents with local LLMs.
Pick PrivateGPT if you need a private, on-prem RAG stack for regulated data and don't want to ship documents to a hosted LLM provider.
Skip it if you just want a hosted chat-with-PDF SaaS and have no interest in self-hosting models or managing infrastructure.
PrivateGPT is an open-source framework (57k+ GitHub stars) built by Zylon for running retrieval-augmented generation on your own documents without any data ever leaving your environment. It exposes an OpenAI-compatible API for ingestion, embedding, and chat-with-docs, and can run fully offline against local open-source LLMs, making it one of the most adopted starting points for on-premises and air-gapped GenAI deployments.
The project is paired with Zylon, the commercial platform from the same team, which layers enterprise plumbing on top: SSO/RBAC, audit logs, rate limits, multi-user workspaces, and managed deployment for regulated buyers in finance, healthcare, government, and critical infrastructure. The OSS core is free; Zylon itself is sold via enterprise contract, with no public pricing or self-serve trial. If you want a private ChatGPT-over-our-files without sending data to OpenAI or Anthropic, this is one of the few mature, batteries-included options.
Under the hood it integrates with LangChain, LlamaIndex, and Qdrant, and is model-agnostic across local backends (llama.cpp, Ollama, vLLM, etc.). Caveat: the OSS repo has slowed since Zylon shifted focus to the commercial product, and you should expect to do real DevOps work to operate it at scale.
PrivateGPT is the default reference implementation for private RAG and a sensible starting point if you're building behind a firewall. The OSS will get you to a demo quickly; the Zylon commercial layer is what you actually buy when compliance and multi-user governance enter the picture.
— The AI Tool Bible editorial team
Pros
- ✅ Fully local and air-gapped; data never leaves your infrastructure
- ✅ OpenAI-compatible API makes integration straightforward
- ✅ Massive OSS community (57k+ stars) with proven deployments
- ✅ Model-agnostic across llama.cpp, Ollama, vLLM, and Qdrant
Cons
- ⚠️ No public pricing for the enterprise Zylon platform
- ⚠️ OSS repo cadence has slowed since the commercial pivot
- ⚠️ Operating at scale still requires meaningful DevOps effort
Use cases
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