Trusted Advisor vs Cost Optimization Hub

AWS Trusted Advisor is a comprehensive advisory service that inspects your AWS environment and provides recommendations across five pillars: cost optimization, performance, security, service limits (quotas), fault tolerance, and operational excellence whereas Cost Optimization Hub is a specialized feature of AWS Billing and Cost Management that consolidates and prioritizes cost optimization recommendations across AWS Organizations member accounts and AWS Regions

Cost Optimization Hub (Not Just Trusted Advisor) As of May 28, 2025, AWS integrated 16 Cost Optimization Hub (COH) checks into Trusted Advisor, and the legacy checks were deprecated on September 9, 2025. This means:Cost Optimization Hub Now Detects:

• Unused Elastic IP Addresses
• Unused EBS Volumes (unattached)
• Unused EC2 Instances (idle)
• Unused NAT Gateways
• Unused RDS DB Instances
• Unused ECS Tasks
• Unused Auto Scaling Groups

What COH Does Better Than Legacy Trusted Advisor:

1. Incorporates your actual pricing discounts - no more overestimated savings
2. Automatically deduplicates overlapping recommendations
3. Integrates with AWS Compute Optimizer for more accurate idle detection
4. Provides recurring S3 exports for automation

https://aws.amazon.com/blogs/aws-cloud-financial-management/optimize-your-aws-spend-with-new-cost-savings-features-in-aws-trusted-advisor/

!!!EDIT!!! (from Jul-2025)

The recommendations in Cost Optimization Hub and Trusted Advisor have been now aligned - check out this latest blog post about the launch announcement - https://aws.amazon.com/blogs/aws-cloud-financial-management/optimize-your-aws-spend-with-new-cost-savings-features-in-aws-trusted-advisor/

Since this has been implemented, I update my answer :) I hope this helps! I'm leaving my previous answer below for context, since the first paragraph about the alignment of Trusted Advisor and Well-Architected pillars is still true!

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[OLD ANSWER]

AWS Trusted Advisor is focusing on multiple pillars and aligns with guidance from AWS Well-Architected Framework; it's more about architectural health and operational best practices recommendations, rather than cost alone.

Cost Optimization Hub is a new feature that provides a consolidated view of recommendations from multiple tools and sources, such as AWS Compute Optimizer, EC2 Rightsizing Recommendations, Savings Plans and Reserved Instances recommendations from the suite of AWS Cost Management & Billing tools.

When it comes to cost optimization recommendations you might find some recommendations in Trusted Advisor that might not be available in Cost Optimization Hub, and vice versa.