The best RAG & Retrieval Platforms
Every option ranked — open-source, self-hostable, and commercial — by our transparent Sovereignty Score, with honest trade-offs so you choose what fits you, not us.
Retrieval-augmented generation — the plumbing that finds the right documents and hands them to a model. The decision is whether retrieval is a managed API you call or a pipeline you own end to end.
L4Models & tooling — layer 4 of the AI stack- 1
LlamaIndex
Top pickOpen sourceThe most complete open RAG framework. Every stage, under your control.
Free and MIT licensed. A paid managed parsing/ingest service exists separately. · in our Vectara comparison →
What is LlamaIndex? →93sovereignty - 2
Haystack
Open sourceExplicit, testable RAG pipelines from deepset. The production-minded one.
Free and Apache-2.0; deepset sells a managed enterprise platform on top. · in our Vectara comparison →
What is Haystack? →92sovereignty - 3
R2R
Open sourceRAG as a deployable server with an API, not a library to assemble.
Free, MIT. Optional hosted tier from the maintainers. · in our Vectara comparison →
What is R2R? →92sovereignty - 4
RAGFlow
Open sourceDeep document understanding — the one for messy PDFs and real-world files.
Free to self-host, Apache-2.0. A managed cloud tier is offered separately. · in our Vectara comparison →
What is RAGFlow? →91sovereignty - 5
Dify
CommercialA self-hostable AI application platform — the closest product-shaped replacement.
Free to self-host under its modified licence; paid cloud tiers available. · in our Vectara comparison →
What is Dify? →74sovereignty
Is it free?
The free tier, its real limits and where you start paying — read from each vendor's own pricing page and dated.
Run these yourself
What each one actually needs — real RAM, honest running cost, and the setup time nobody quotes.
- Self-hosting LlamaIndex 4 GB for the app; your vector store is the real cost
- Self-hosting Haystack 4 GB
- Self-hosting RAGFlow 16 GB
- Self-hosting Dify 8 GB. The default compose file starts 16 containers — api, api_websocket, worker, worker_beat, web, plugin_daemon, agent_backend, Weaviate, PostgreSQL, Redis, nginx, two SSRF proxies, two sandboxes and a one-shot init job — and Dify's own macOS instructions ask for a Docker VM with 8 GiB. More if a local model shares the box.
Replacing a specific tool?
Head-to-head comparisons for each popular rag & retrieval platforms product.
Straight head-to-heads
Two rag & retrieval platforms tools, side by side — verified facts and a plain verdict.