The most straightforward and seamless way is having an agency account. If your client already started an app and is on starter, they can add you without any additional cost.

If you’re building a new app, you create it, build it, add your client as a collaborator, then when you’re ready, you can transfer the app to the client and have the option to stay on as an admin collaborator (this is new thanks to @theo.goldberg)

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