Apple Watch app
Diarly has a companion mini-app available for Apple Watch. It currently supports creating new notes on the go without taking the phone from the pocket.
After you open the Diarly on Apple Watch, you will have the option to create a new note entry. These entries will be synced with the iPhone app the next time you open Diarly on iPhone. You can also choose a journal you want the note to be created in. Each new note is added to the timeline.
The Apple Watch app should be installed automatically. If it isn't, you can install it from the AppStore on your Watch. For more details please refer to Apple's guide for downloading apps on Apple Watch.