App Service Plan Vs App Service Environment
App Service Plan- ASP
An App Service Plan represents a set of compute resources (virtual machines) that host your web apps, mobile apps, or API apps. It defines –
Region
pricing tier (which determines the VM size and resources)
number of VM instances
Multiple apps can run on the same App Service Plan, sharing the compute resources.
Features:
Multi-tenant, meaning the VMs are shared across multiple customers
Provides less control over network configuration and isolation
Suitable for most general-purpose web apps
App Service Environment-ASE
An App Service Environment is an isolated and dedicated environment to run your App Service Plans. It is essentially a deployment of the Azure App Service into your own Azure Virtual Network.
Features:
Provides network isolation by deploying into your own VNet
Allows granular control over inbound and outbound network traffic
Enables secure, high-speed connections over VPNs to on-premises resources
Suitable for applications requiring very high scale, isolation, or high memory utilization
Available in two SKUs: ASEv2 (automated infrastructure scaling) and ASEv1 (manual infrastructure scaling)
Incurs additional costs beyond an App Service Plan for the dedicated environment
In summary, an App Service Plan runs on a multi-tenant infrastructure, while an App Service Environment provides a dedicated and isolated runtime environment within your own VNet for enhanced security, control, and scale.
It is safe to say that ASE is premium/isolated pricing plan of App service plan
How to choose-
ASP | ASE |
You don't require network isolation or secure VPN connectivity to on-premises resources | You require network isolation by deploying your apps into your own Azure Virtual Network |
Your application doesn't have very high scale or high memory utilization requirements | You need secure, high-speed VPN connectivity to on-premises corporate resources |
You don't need granular control over inbound and outbound network traffic | Your application requires very high scale, with ability to scale out to a large number of instances |
Cost is a major concern, as App Service Plans are more cost-effective for general workloads | Your application has high memory utilization requirements |
| You need granular control over inbound and outbound network traffic to/from your apps |
| You're willing to pay a premium for the dedicated, isolated runtime environment |
Use an App Service Environment when you require enhanced security, isolation, control, and scalability, and are willing to pay more for a dedicated environment within your VNET