Since Version 2.7.0 Outbank is available for Apple Watch. These are the features:
Unread Transactions:
See the unread transactions and your current balance on your display.
Connected Accounts:
You can see all connected and active accounts.
Complications:
Depending on the Face Design you will see the number of unread transactions and the current balance
Notifications:
Get notified about account changes and mark new transactions directly as read from the Apple Watch.