AWS App Runner vs ECS Express Mode: Git, ECR, Scaling, and Security Explained

Source: Dev.to | Dec 24, 2025 (UTC)

Introduction

AWS provides modern ways to run containerized applications without managing servers. Two popular options are AWS App Runner and Amazon ECS Express Mode. Both simplify container deployments, but they target different levels of control and use cases.

This blog compares these services and provides guidance on which to use for different workloads, based on AWS documentation.

Service Overview

AWS App Runner

App Runner is a fully managed service for running web apps and APIs:

• Git Integration: Connect GitHub, GitLab, or Bitbucket directly to deploy applications.
• Container Registry Support: Deploy pre-built container images from Amazon ECR (public or private) or Docker Hub.
• Auto-scaling: Concurrency-based scaling; configure min/max instances and max requests per instance.
• Security: Built-in HTTPS, AWS-managed TLS certificates, and WAF support.
• Logging & Monitoring: CloudWatch logs and metrics out-of-the-box.
• Public/Private Access: Default public endpoint; can connect to VPC for private resources.
• Use Case: Stateless web apps, public APIs, rapid deployment with minimal operational overhead.

Amazon ECS Express Mode

ECS Express Mode is a simplified ECS deployment option:

• ECS Power: Runs on ECS + Fargate without manual cluster management.
• Networking & Security: Full VPC, IAM roles, subnets, security groups.
• Scaling: CPU, memory, or custom metric-based auto scaling.
• Workloads: Supports sidecars, background jobs, and complex internal services.
• CI/CD: Requires building container images and pushing to ECR or another registry.
• Use Case: Enterprise workloads, private/internal services, and production applications needing full control.

Feature Comparison Table

Feature

App Runner

ECS Express Mode

Git Integration

✅ Yes

❌ No

Container Registry

✅ ECR

✅ ECR

Auto Scaling

✅ Concurrency-based

✅ CPU/memory/custom metrics

WAF Support

✅ Yes

✅ via ALB

HTTPS

✅ Built-in

✅ ALB + ACM

Public Endpoint

✅ Yes

✅ Yes

Private Networking

⚠️ Limited (VPC connector)

✅ Full

Logging & Metrics

✅ CloudWatch

✅ CloudWatch

Background Workers / Sidecars

❌

✅ Yes