This app was mentioned in 6 comments, with an average of 1.33 upvotes
Remember the milk is great. I've been using it for many years.
"Remember The Milk: To-Do List on the App Store" https://apps.apple.com/us/app/remember-the-milk-to-do-list/id293561396
https://play.google.com/store/apps/details?id=com.rememberthemilk.MobileRTM
Checkout Remember The Milk. It may do what you want but I'm couldn't tell from the website what's included in the free vs the paid version.
I use Remember The Milk, it's pretty neat. https://play.google.com/store/apps/details?id=com.rememberthemilk.MobileRTM https://www.rememberthemilk.com
Remember the milk has a tagging feature:
https://play.google.com/store/apps/details?id=com.rememberthemilk.MobileRTM&hl=en