R2R review
An open-source RAG system for multimodal ingestion, hybrid search, and cited answers.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
R2R is an open-source retrieval system for developers building retrieval-augmented generation applications. Its REST API covers document ingestion and management, search, cited RAG responses, and agentic multi-step research across a knowledge base and the internet. The range of supported inputs—including text, PDFs, JSON, images, and audio—makes it a fit for teams exploring multimodal RAG rather than a narrow text-only workflow. It is aimed at developers comfortable working with an API and running their own deployment.
R2R’s feature set centers on retrieval depth. Hybrid semantic and keyword search uses reciprocal rank fusion, while knowledge graph extraction identifies entities and relationships. The agent can carry out multi-step research, and responses can include citations. Authentication and collection-based access management support controlled access to documents. These capabilities make R2R worth considering when a project needs more than basic vector retrieval; teams seeking a simpler, narrowly scoped search component may prefer a more focused option.
The project can be installed with Python or JavaScript SDKs and run locally or deployed with Docker, with self-hosting documentation available. That gives developers deployment control, but also means the team is responsible for operating its chosen environment. R2R is open source with a free plan, and community is the listed support channel. It makes sense for teams of different sizes that have the technical capacity to self-host and want to explore multimodal, agentic retrieval. Teams looking for a hosted service or dedicated support should consider alternatives better aligned with those needs.
R2R pros and cons
- Where it wins
- Ingests text, PDFs, JSON, images, and audio
- Combines semantic and keyword search with reciprocal rank fusion
- Supports cited RAG responses, knowledge graphs, and agentic retrieval
- Where it doesn't
- Self-hosting puts deployment responsibility on the team
- API-focused; no integrations are listed
- Community support may not suit teams needing dedicated support
R2R fact sheet, pricing and score →
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