Which tool helps monitor and improve applications' performance while also enabling compliance?

The most suitable tool for monitoring and improving application performance while also enabling compliance is AWS Trusted Advisor. This service provides insights and recommendations across various aspects of your AWS environment, including performance, security, fault tolerance, cost optimization, and service limits.

Trusted Advisor evaluates your account against AWS best practices and delivers suggestions to help you optimize your applications. For instance, it checks for idle or underutilized instances and suggests right-sizing or eliminating unused resources, which can improve performance and reduce costs. Additionally, it provides compliance checks related to security and helps ensure that best practices are followed, which contributes to maintaining regulatory compliance.

While the other tools mentioned serve specific functions, they do not encompass the dual focus on performance improvement and compliance in the same comprehensive manner as AWS Trusted Advisor. For example, AWS CodeDeploy is primarily focused on automating code deployments, Amazon Inspector is centered on assessing application security vulnerabilities, and Amazon GuardDuty is aimed at detecting malicious activity and threats. These tools play important roles in their respective areas but do not provide the broad analysis and recommendations that Trusted Advisor offers.