When comparing GTasks vs Ultimate To-Do List, the Slant community recommends GTasks for most people. In the question“What are the best to-do list apps for Android?” GTasks is ranked 33rd while Ultimate To-Do List is ranked 42nd. The most important reason people chose GTasks is:
Unlimited subtasks or sub sub tasks, as deep as you need, excellent for project work.
Specs
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Pros
Pro Unlimited subtasks
Unlimited subtasks or sub sub tasks, as deep as you need, excellent for project work.
Pro Synchronizes with Google tasks available natively in GMail
Seamlessly syncs tasks.
Pro dark theme available
Pro time reminder is supported
Pro Closing parent task closes sub tasks
Pro Available on iOS
Pro Works with Chrome's 'Google Tasks Panel' extension
Pro Syncs with Toodledo and/or Google tasks
After set-up, it will automatially sync with your Google Tasks or Toodledo accounts.
Pro Good, configurable widget
The widget is customizable and lets you edit or mark tasks as completed.
Pro Functionality rich
Cons
Con Pop up ads get in the way
The app frequently displays popup ads when you navigate the app, forcing you to pause to close them.
Con No recurring tasks fom completion
Con Does not support attachments
You cannot add attachments to tasks.
Con Interface can get a bit noisy
With the amount of information the app presents it can get a bit difficult to easily overview tasks.