Found these ones from a google search.
https://zapier.com/blog/best-todo-list-apps/
A Reddit review said: "TickTick has a lovely "Ding!" when you complete a task. It also has a scoring system where you can earn badges for completing tasks or doing other things. Beyond that it's the best task manager I've ever used."
Someone else recommended Habitica: "Habitica is a free habit-building and productivity app that treats your real life like a game. With in-game rewards and punishments to motivate you and a strong social network to inspire you, Habitica can help you achieve your goals to become healthy, hard-working, and happy."
https://habitica.com/static/home
I don't have any personal experience with any of them. That would be way too organised. I like to make to-do lists, lose them or forget about them, start over with a new list, forget about that, and the cycle continues...
