21 RAG & Memory AI tools
AI services in the RAG & Memory field. Click a name to see its description, pricing and alternatives.
RAG & Memory: free vs paid at a glance
14 tools with official pricing data. 13 have a free plan, 2 offer a Korean UI. Cheapest paid plan: Mem0 ($19/mo).
| Tool | Free | Cheapest monthly | Korean | Where |
|---|---|---|---|---|
| Cognee | Yes | — | No | Web, CLI, API |
| Cohere Rerank 3 | Yes | — | Yes | API |
| Haystack | Yes | — | No | API |
| Jina Reranker | Yes | — | Yes | API |
| LangChain | Yes | $39/mo | No | API, CLI |
| Letta (MemGPT) | Yes | $20/mo | No | Web, Windows, Mac |
| LlamaIndex | Yes | $50/mo | No | Web, API |
| LlamaParse | Yes | $50/mo | No | API |
| Marker | No | — | — | CLI |
| Mem0 | Yes | $19/mo | No | API, CLI |
| Reducto | Yes | — | No | Web, CLI, API |
| supermemory | Yes | $19/mo | No | API |
| Unstructured | Yes | — | No | Web, API |
| Zep | Yes | $125/mo | No | Web, API |
From each tool's official pricing page (checked by 2026-10-14). '—' means not stated. Prices change, so check before paying.
How to choose
- Try a tool with a free plan first and check the limit before paying.
- If you need Korean menus, filter by the Korean column.
- Annual plans are often cheaper; the table shows monthly prices.
BGE Reranker
BAAI's high-performance multilingual reranker
Read the guide →FreeCognee
Semantic memory layer building knowledge graphs for AI agents
Read the guide →Free + paidCohere Rerank 3
State-of-the-art reranking model for RAG relevance
Read the guide →FreeColBERT
Late interaction retrieval model with token-level embeddings
Read the guide →FreeDocling
IBM's fast document conversion and parsing toolkit
Read the guide →Free + paidDSPy
Framework for algorithmically optimizing LM prompts and pipelines
Read the guide →FreeFlashRank
Ultra-lite cross-encoder reranking for RAG
Read the guide →Free + paidHaystack
End-to-end NLP framework for LLM apps
Read the guide →Free + paidJina Reranker
Multilingual reranker for improving RAG precision
Read the guide →Free + paidLangChain
Framework for developing LLM-powered applications
Read the guide →Free + paidLetta (MemGPT)
OS-inspired memory management for LLMs enabling unbounded virtual context
Read the guide →Free + paidLlamaIndex
Data framework for LLM applications
Read the guide →Free + paidLlamaParse
Optimized document parsing for RAG by LlamaIndex
Read the guide →FreeMarker
Convert PDFs to markdown quickly and accurately
Read the guide →FreeMem0
Universal persistent memory layer for AI agents and assistants
Read the guide →Free + paidReducto
High-accuracy document extraction for complex PDFs
Read the guide →Free + paidSemantic Kernel
Microsoft's SDK for AI orchestration
Read the guide →Free + paidSpring AI
Spring framework for Java AI application development
Read the guide →Free + paidsupermemory
Memory and context API that gives AI agents long-term recall
Read the guide →FreeUnstructured
Document processing for RAG pipelines
Read the guide →FreeZep
Temporal knowledge graph memory for agents (Graphiti)
Read the guide →