Currently, there are three different Shortcuts available.
First, you can directly open a specific folder in Spark. You can also have Siri search for a specific email by sender or a strong a text.
Finally, users can also create a Shortcut to compose an email to a person or group.
Other Shortcuts options are promised soon.
Spark is designed for the iPhone and all iPad models. There is also a useful Apple Watch app available. It can be downloaded now on the App Store for free.