Since the beginning Planny supports Siri. You can create tasks and lists using Siri and also mark tasks as completed.
Try commands like:
"Create a shopping list with bananas on <appName>“
"Add persimmons to my shopping list on <appName>"
"Remind me to buy dog food on <appName>“
Due to Siri limitations from Apple Siri doesn't work all the time. Currently there's no way to change that.
Siri currently offers three shortcuts for opening the app and showing the today list or the forecast and also for custom lists.
Planny already has build in support for adding tasks to lists and getting information about lists using Siri Shortcuts. But as long as Apple doesn't allow developers to access parameters inside the Shortcuts App, they won't work.