One of the plans we have for the full hosted version is to create an auth flow that scopes permissions granted, kind of like how Facebook apps can only do certa

One of the plans we have for the full hosted version is to create an auth flow that scopes permissions granted, kind of like how Facebook apps can only do certain things. So perhaps one app only has access to read mail from flights@virginamerica.com, and another only has the ability to create drafts but not read mail, etc. As for what can be built on top of Inbox, it's really up to the developer. You can build a full-featured mail client, or just add a simple filter. Check out the docs for more details. We also have SDKs for iOS and JS. https://www.inboxapp.com/docs https://www.inboxapp.com/docs