Hello Pardeep, Do you refer to App Engine Standard Environment? When an application is not being used at all, App Engine turns off its associated dynamic instances, but readily reloads them as soon as they are needed. Reloading instances can result in loading requests and additional latency for users. In your case, if you have old versions not serving any traffic, no instances are running, so no related costs are incurred. Applications running in the App Engine standard environment <https://cloud.google.com/appengine/docs/about-the-standard-environment> are deployed to instance classes <https://cloud.google.com/appengine/docs/about-the-standard-environment#instance_classes> that you specify. Costs are per hour per instance, so no costs are incurred with no instance running. You may gather more detail from the "App Engine Pricing" page <https://cloud.google.com/appengine/pricing>. You may also use the Pricing Calculator <https://cloud.google.com/products/calculator/#tab=app-engine>.
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