Your app isn't limited by one instance whether you have one or more 
services up (i.e. the more traffic you get - the more instances wil be 
fired up even if you only have one service).

Anyways, yes, you are correct - adding additional services will require new 
/ separate instances to be running so in many cases it will slightly 
increase the cost.

On Tuesday, March 6, 2018 at 10:58:55 PM UTC+2, asmith26 wrote:
> Hi there,
> I am trying to determine if I should break my GAE project from one service 
> to multiple smaller services.
> Does each service added cost 1 more instance hour? Looking at the 
> following chart, it would indicate it might:
> [image: Hierarchy graph of services/versions/instances]
> Thus I am wondering if 1 app running only 1 instance would be cheaper than 
> running multiple services?
> Many thanks for any help in advance!

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