I have downloaded the main habit apps on the play store to get some inspiration, I have recorded them too to see a little of their interface, these apps are for android

Here the videos:

Habitos

https://youtu.be/01rRdmdmHCY

HabitNow

https://youtu.be/-sfGnPO3Fkk

HabitBull

https://youtu.be/Ur3fIH1mVs0

Avocation:

https://youtu.be/hPVUXgd67kc

Goal Tracker

https://youtu.be/4c54CZmYY8w

Notes:

• All the apps have like a mini-tutorial when you open the app the first time, they try to explain the main things like how to create the first habit or how to follow the progress
• A Floating Action Button would be a good idea to save the habits, because I think it is the main action of the app
• The colors I saw the most in the apps were blue and red