AWS CloudWatch vs Datadog: Native Cloud vs Third-Party Monitoring

Overview

AWS CloudWatch is the native monitoring and observability service built into AWS. Datadog is a third-party SaaS observability platform with deep AWS integration alongside support for GCP, Azure, and on-premises infrastructure. For AWS-only environments, CloudWatch provides seamless integration at lower cost. For multi-cloud or teams needing richer observability, Datadog's capabilities extend far beyond CloudWatch.

Key Technical Differences

CloudWatch's native integration is its primary advantage. Every AWS service — EC2, RDS, Lambda, ECS, EKS, SQS, and 200+ others — automatically publishes metrics to CloudWatch without any agent or configuration. For AWS-managed services that can't be accessed directly (RDS internals, ElastiCache, DynamoDB), CloudWatch is the only way to monitor service-side metrics. AWS X-Ray provides distributed tracing for Lambda and AWS-native services.

Datadog ingests CloudWatch metrics via AWS metric streaming and the CloudWatch API, providing comparable AWS coverage within its richer dashboard and alerting platform. However, for AWS-managed service metrics (RDS Enhanced Monitoring, Aurora internal metrics), CloudWatch remains the authoritative source.

CloudWatch's Logs Insights query language is functional but less powerful than Datadog's log search. CloudWatch Dashboards are usable but cannot match Datadog's customization, sharing, and templating capabilities. CloudWatch Alarms are straightforward but lack Datadog's composite monitor, anomaly detection, and outlier detection features.

Performance & Scale

CloudWatch is a native AWS service with essentially unlimited scale — it handles metric ingestion from the world's largest cloud deployment. Datadog is also cloud-scale. The performance difference for most workloads is negligible.

When to Choose Each

Choose CloudWatch for AWS-only environments where native integration, serverless monitoring, and AWS-managed service visibility at low cost are priorities. It's the right foundation for AWS-native teams.

Choose Datadog for multi-cloud, when APM, richer dashboards, and advanced alerting features are needed, or when a unified observability experience across cloud and on-premises infrastructure is valuable.

Bottom Line

CloudWatch is the right starting point for AWS-native teams; Datadog is the right choice when richer observability capabilities, multi-cloud support, or superior APM justify the additional cost.