Side by side
LangChain vs RAGStack
Both stand on retrieval-augmented generation tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Choose LangChain to build agents around models and tools using its configurable harness, middleware, and wide range of integrations. Look elsewhere if you need multiple LangSmith seats or trace capacity beyond the free Developer allowance without pay-as-you-go charges; Plus costs $39 a month per seat.
Visit LangChainRAGStack combines RAG components with version compatibility and vulnerability checks, while supporting two stated vector-store options. Check the TypeScript package limits and Astra DB conditions against your project needs.
Visit RAGStackThe facts
| LangChain | RAGStack | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Self-hosted | Linux, Mac, Self-hosted, Windows |
| Lowest paid plan | See the plans | Free or on request |
| Plans published | 4 | 1 |
| Maker | Not published | Not published |
| Website | langchain.com | github.com |
| On retrieval-augmented generation tools | #12 of 26 | #16 of 26 |
LangChain: what it does well
- Free, MIT-licensed open-source framework.
- More than 1,000 documented integrations across models, tools, loaders, and vector stores.
- Middleware supports approval, guardrails, retries, routing, and sensitive-data removal.
- Standard interfaces make provider changes possible with minimal code changes.
- LangSmith supports tracing, debugging, and output evaluation.
What to know first
- LangSmith Developer has one seat.
- Developer includes up to 5k base traces monthly before pay-as-you-go charges.
- Enterprise pricing is custom and invoiced annually upfront.
RAGStack: what it does well
- Open-source RAG package is listed as free.
- Supports Astra DB Serverless or Apache Cassandra as vector stores.
- Includes RAG fusion and FLARE techniques.
- Compatible with LangSmith for deployment monitoring.
What to know first
- TypeScript package includes only a subset of LangChain libraries.
- Enterprise support and compliance offerings apply when run in Astra DB.
Alternatives to LangChain Alternatives to RAGStack The whole list