All stacks

Knowledge Base Stack

Production-ready document Q&A system. Upload documents, ask questions, get cited answers.

$0-50/month6 layers

Best For

Internal wikis, legal document analysis, customer support, research assistants, exam prep

Stack Components

1
Framework

LlamaIndex / LangChain

RAG orchestration, ingestion to query end-to-end

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2
Vector DB

ChromaDB / Weaviate / Supabase

Document storage and retrieval

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3
Embeddings

E5-Mistral-7B (best accuracy)

Best open-source embeddings for retrieval accuracy

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4
LLM

Claude Sonnet 4.6 (79.3% SWE)

Excellent at following instructions and citing sources

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5
UI

Open WebUI

Chat interface with document upload, RAG-ready out of the box

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6
Eval

RAGAS

Measure RAG pipeline performance

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Tools in this Stack

Claude Code

Anthropic's official CLI for Claude Sonnet 4.6

Free tierAPIPopular
No credit card required
Limited free usage with Sonnet 4.6
API3 models
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LlamaIndex

Production RAG framework

Open sourcePopular
No credit card required
100% open source
Hybrid
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ChromaDB

Simple Python-native vector DB

Open sourcePopular
No credit card required
Free, unlimited local
Hybrid
View ChromaDB details

RAGAS

RAG evaluation framework

Open sourceLocal
No credit card required
Open source
Local
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BGE Embeddings

Best accuracy, self-hostable

Open sourcePopular
No credit card required
Free, self-host or HF
Hybrid
View BGE Embeddings details