When comparing Toodledo vs Loop - Habit Tracker, the Slant community recommends Loop - Habit Tracker for most people. In the question“What are the best habit tracking apps for Android?” Loop - Habit Tracker is ranked 2nd while Toodledo is ranked 6th. The most important reason people chose Loop - Habit Tracker is:
App layout is simple, one can easily customize it the way one wants.
Specs
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Pros

Pro Can create to-do items via email
It's possible to create a to-do item by sending or forwarding an email.
Pro Decent filtering and sorting
Pro Priority organizing
Pro Great GTD implementation
The GTD principles are very perfectly supported by Toodledo.
Pro Functionality-rich
Integrated sharing, note taking, habit tracking, and outlining make this a more powerful tool than a simple list of to-dos.
Pro Upload From CSV
Quickly upload an excel (CSV) file template of tasks to a folder for complex but repeating projects.
Pro Well documented, free-to-use JSON API
If you adopt Toodledo as your productivity system, you can be confident that you can extend it to fit your needs with this programmatic access.
Pro Can tag items
Pro Space to add lengthy text
Notes area that can then be hidden.

Pro Sends a daily email reminder
Toodledo reminds you via email of the tasks on your plate for the day.
Pro Apple Watch support
Integrated support for Apple Watch lets you check on your to-dos on the run.
Pro Simple yet effective
App layout is simple, one can easily customize it the way one wants.
Pro Free and open source
The app is open source and completely free to use, without any ads.
Pro Supports flexible schedules (certain number of days every week)
The flexible schedule feature allows you to set the habit for a certain number of days every week. For example, "Wake up at 7am" 5 days a week. This way you don't have to change the habits frequently, or risk losing your streak.
Pro Nice and clean UI
Cons
Con Free version limited to 20 folders
Con Android app has annoying notifications
Whenever the app fails a background sync action for any reason (server issues, lack of internet connection, etc.), a notification appears.
Con Good as a starting point
Toodledo is a good starting point, but is essentially the same as an Excel spreadsheet where you have to build your workflow via the saved searches.
Con No cloud backup
There is no option to backup the data to the cloud, and no option to backup the data to your storage. You have to manually export the backup file every time.
