I use todolist on a daily basis. I would upgrade to the pro version if it were a "one time payment".
One time payment
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Ultimate To-Do List is actually a one-time payment. Once you buy the app, you never have to purchase again as long as you have a device that is linked to the same Google account.
I’m guessing that you are referring to Toodledo.com, which our app synchronizes with. We do not operate Toodledo, so I would recommend taking your suggestion to them.