When comparing Clear Todos vs Things 2, the Slant community recommends Things 2 for most people. In the question“What are the best to-do list apps for iOS?” Things 2 is ranked 3rd while Clear Todos is ranked 4th. The most important reason people chose Things 2 is:
Users need to create an account for Things Cloud (the account can be created from any device). Once signed up, cloud sync will be active, and you’ll have to login on all of your devices to complete setup. From that point on, syncing happens in the background. It is invisible and always reliable.
Specs
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Pros
Pro Awesome interaction with gestures
Interaction design is the best feature of Clear, you can navigate the entire app via intuitive gestures. Clear takes advantage of touch screen features, using only finger gestures such as swiping, pulling or tapping to create a new task, remove one or editing one.
Pro Reliable sync
The app can reliably sync over iCloud with your other iOS devices and your Mac.
Pro iPad support
Clear now supports the iPad, and the app really shines when it comes to using this new expanse. Instead of showing you only a single list of lists or tasks, as the older iPhone-only version did, on an iPad the new Clear splits the main view into two columns: On the left is your master list of lists (containing, for example, lists for personal, work, and home); on the right is the list of tasks for whichever list you select.
Pro Cloud sync
Users need to create an account for Things Cloud (the account can be created from any device). Once signed up, cloud sync will be active, and you’ll have to login on all of your devices to complete setup. From that point on, syncing happens in the background. It is invisible and always reliable.
Pro Daily review
At the beginning of every day, a yellow box appears at the top of the Today section, displaying all tasks scheduled for this day. You can investigate them, and then decide which ones you’ll have for that day and which one you’d rather want to delay.
Pro Easy to set up and use
Things 2 works from the moment you start it up. Simply add a task and when you want it done by. You can also add notes to tasks or tag when you need them. Things allows you to quickly and easily start keeping track of your tasks.
Pro Project support
Things 2 has a projects feature that allows you to organize your tasks together. You can select a project you need to get done and Things helps you focus on each task to get it done. You can even group projects together to focus on the most important aspect of your life at the time.

Pro Great for GTD
Things is one of the best apps of doing Getting Things Done.
Pro Nested tags
It's very easy filtering tasks that belong to various areas (etc private vs work)
Pro Responsive and easy naviagation
Logical and responsive navigation and editing. Easy to operate.
Pro Customized calendar
The calendar view (when selecting a due date for a task) is a customized, scrollable version of the default iOS calendar view. This makes it look familiar, but also functional for Things 2's requirements.
Cons
Con Very restrictive
Clear is not as functional due to restrictions. For example, the 28 character task name limit does not allow all tasks to be named and described. Clear also does not feature reminders, calenders or app integration. Clears main function is being a to-do list without any extra functions. If its all you need, Clear may work for you. But, for those needing more features and organization, Clear is a bit lacking.
Con Expensive if you buy apps for Mac, iPhone and iPad (all sold separately)
As at May 2016 if buying all three apps it cost $80! That said there is no annual subscription and I've been using Things for years and have only paid once so far.
Con Poor calendar view
Could be more convenient with calendar interaction. Not an ordinary approach for visual people, if you want to see all the calendar events in the familiar format.
Con No file attachment available
Con No supported time based/location based alarms
Other apps have these abilities, and they are very useful. Especially for a $10 app, it would be great to include these premium features.
