When comparing Things 2 vs Do It (Tomorrow), the Slant community recommends Things 2 for most people. In the question“What are the best cross-platform task apps?” Things 2 is ranked 24th while Do It (Tomorrow) is ranked 61st. 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
Ranked in these QuestionsQuestion Ranking
Pros
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.
Pro Free and without ads
Do It (Tomorrow) is available as a free app on the web, on iOS and on Android – none of which have ads.
Pro Notebook simulation
Do It (Tomorrow) simulates the feeling of writing your to-do list on an actual by hand. You can switch the font style back to the system default font if desired.
Pro Shorter timeframes lead to better productivity
Unlike other to-do list apps that allow users to schedule tasks far into the future, Do It (Tomorrow) allows tasks to be scheduled for today and tomorrow only. This ensures users stay focused on things that need to get done in the short term.
Pro Clean and simple
Do It (Tomorrow) shows only the list of to-do items for today and tomorrow. No labels, tags, or other categories are needed.
Cons
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.
Con iPad version of Do It (Tomorrow) has a one-time fee
iPad users who want to use the app must pay a one-time fee of $4.99.
Con Limited scheduling options
Because Do It (Tomorrow) limits scheduling options to today and tomorrow, there’s not much use for functions like alerts or recurring events.
