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MCP Server Comparison

AWS KB Retrieval MCP vs PostgreSQL MCP — Which MCP Tool is Better in 2026?

A side-by-side comparison of AWS KB Retrieval MCP and PostgreSQL MCP: features, pricing, platform support, ease of setup, and which MCP server fits your stack.

A

AWS KB Retrieval MCP

Query AWS Knowledge Base with AI

APIs & Data
3.9Open Source · Free
Visit Tool
P

PostgreSQL MCP

Give AI direct access to your PostgreSQL database

Database✓ Verified✦ Featured
4.6Open Source · Free
Visit Tool

Feature comparison

AWS KB Retrieval MCP
PostgreSQL MCP
Pricing model
Open Source
Open Source
Free tier
Available
Available
Starting price
$0
$0
Key features
  • aws
  • bedrock
  • rag
  • Auth helpers for common providers
  • Pagination and rate-limit handling
  • Endpoint allow-lists
  • postgres
  • sql
  • Schema introspection across tables and views
  • Parameterised SQL execution
  • Read-only and read/write modes
  • Connection pooling and timeouts
Platform support
All Models
All Models
GitHub stars
32,100 ★
32,100 ★
Last updated
May 2026
May 2026
Ease of setup
Advanced
Easy
Best for
Query AWS Knowledge Base with AI
Give AI direct access to your PostgreSQL database
Community
64 upvotes
289 upvotes

Install AWS KB Retrieval MCP

$npx @modelcontextprotocol/server-aws-kb-retrieval

Install PostgreSQL MCP

$npx @modelcontextprotocol/server-postgres

Our Verdict

AWS KB Retrieval MCP is better for apis & data use cases, while PostgreSQL MCP is better for database use cases and quick setup.

Both AWS KB Retrieval MCP and PostgreSQL MCP are solid MCP servers. Pick AWS KB Retrieval MCP if you need apis & data use cases. Pick PostgreSQL MCP if you need database use cases and quick setup.

Try AWS KB Retrieval MCP Try PostgreSQL MCP

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Frequently asked questions

Is AWS KB Retrieval MCP better than PostgreSQL MCP?

AWS KB Retrieval MCP is the stronger pick for apis & data workflows, while PostgreSQL MCP wins for database. There's no universal winner — it depends on your stack, budget, and which MCP clients you use.

What is the difference between AWS KB Retrieval MCP and PostgreSQL MCP?

AWS KB Retrieval MCP (Open Source) focuses on Query AWS Knowledge Base with AI. PostgreSQL MCP (Open Source) focuses on Give AI direct access to your PostgreSQL database. They also differ on ease of setup (Advanced vs Easy) and platform support.

Is AWS KB Retrieval MCP free?

AWS KB Retrieval MCP is Open Source (starting at Free).

Is PostgreSQL MCP free?

PostgreSQL MCP is Open Source (starting at Free).