Best Retrieval-Augmented Generation Tools in 2026
Updated
In short: Haystack Enterprise Platform is ranked #1 of 23 as of 3 October 2026, ahead of RAGFlow and Flowise. The best-ranked option with a free plan is RAGFlow. The lowest first paid tier on this page is RAGFlow at $29/mo.
23 retrieval-augmented generation tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | Platform | Score | Why | From | Free plan | Paid from | Source citations | |
|---|---|---|---|---|---|---|---|---|
| 1 | Haystack Enterprise Platform | 8.9 | RecognisedAPIDocumented | Free | Yes | — | Yes | View |
| 2 | RAGFlow | 8.8 | RecognisedAPIDocumented | $29/mo | Yes | 29 /mo | Yes | View |
| 3 |  Flowise | 8.5 | RecognisedAPIDocumented | $35/mo | Yes | 35 /mo | — | View |
| 4 | Dify | 8.5 | RecognisedAPIDocumented | $49.17/mo | Yes | 59 /mo | — | View |
| 5 |  OpenRAG | 8.5 | RecognisedAPIDocumented | Free | Yes | — | Yes | View |
| 6 |  I3K RAG Enterprise | 8.2 | RecognisedAPIDocumented | Free | Yes | — | Yes | View |
| 7 |  Langflow | 8.1 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 8 | AnythingLLM | 8.0 | RecognisedAPIDocumented | — | Yes | 50 /mo | — | View |
| 9 | Vectara | 7.0 | RecognisedAPIDocumented | $8333.33/mo | No | — | Yes | View |
| 10 | Azure AI Speech | 6.9 | RecognisedAPIDocumented | Free | — | — | — | View |
| 11 | Haystack | 6.6 | RecognisedAPIDocumented | — | — | — | Yes | View |
| 12 |  Ragen | 6.5 | RecognisedAPIDocumented | Free | Yes | — | Yes | View |
| 13 | Kapa.ai | 6.3 | RecognisedAPIDocumented | — | No | — | Yes | View |
| 14 | LangChain | 6.2 | RecognisedAPIDocumented | — | Yes | — | Yes | View |
| 15 | LlamaIndex | 5.8 | RecognisedAPIDocumented | — | Yes | 50 /mo | — | View |
| 16 |  txtai | 5.5 | RecognisedAPIDocumented | — | — | — | Yes | View |
| 17 |  PrivateGPT | 5.3 | RecognisedAPIDocumented | — | — | — | Yes | View |
| 18 |  Graphiti | 5.3 | RecognisedAPIDocumented | — | — | — | — | View |
| 19 | Progress Agentic RAG | 5.2 | RecognisedAPIDocumented | — | No | 700 /mo | Yes | View |
| 20 |  Pathway Live Data Framework | 5.1 | RecognisedAPIDocumented | — | Yes | — | — | View |
| 21 |  RAGStack | 5.0 | RecognisedAPIDocumented | — | — | — | Yes | View |
| 22 |  Quivr | 4.9 | RecognisedAPIDocumented | — | No | — | No | View |
| 23 |  ServerBackup | 4.9 | RecognisedAPIDocumented | — | Yes | — | — | View |
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which retrieval-augmented generation tool is ranked first on Inferse?
Haystack Enterprise Platform is ranked #1 of 23 with a score of 8.9. RAGFlow is second and Flowise third.
How many of these have a free plan?
9 of the 23 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, RAGFlow has the lowest first paid tier we found: $29/mo.
How is this list ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.