Plans

App Service Plans define a set of computing resources where web apps can run.

one or more web apps can be run on a single app service plan
resources are shared between apps on the same plan

When you create an app service plan, you define:

OS
Azure region
No. instances
VM size (s, m, l)
Tier (price + compute power)

Note

Crucially, you don't choose hardware specifically, you choose a level of performance.

Tiers

Pricing tiers can be divided into three distinct groups

Shared where your workers share resources with apps in other plans
- Free
- Shared
Dedicated where your workers share resources with other apps in your plan
- Basic
- Standard
- Premium (v1, v2 and v3)
Isolated where only this app has access to resources in the plan
- Isolated (v1 and v2)

Resource sharing

In dedicated plans, your actual app workloads run on dedicated hardware for the plan, however, other elements in the distributed App Service system are shared with other plans. For example, you may share virtual IP addresses with other plans

An isolated plan may be beneficial if your app:

is resource intensive
needs to scale independently from your other apps
requires access to resource in another geographical region