Habitify does not support direct function to check in on your habit by voice. However, there is the integration with iOS shortcuts, so this is the work-around for you.
Create the shortcuts with Habitify. You can read this article to learn about the shortcuts: Use shortcuts .
Name your shortcuts as easy as for you to remember.
Then just "Hey Siri!" and call out the name of your shortcuts
After running the shortcut, Siri tells you the result.
When your device is locked and you run a shortcut that opens Habitify, Siri asks to unlock your device before continuing.
To verify that you can use “Hey Siri” on your device, see the Apple Support article Devices that support “Hey Siri.”