When comparing Toodledo vs Flow-e, the Slant community recommends Toodledo for most people. In the question“What are the best GTD apps?” Toodledo is ranked 6th while Flow-e is ranked 28th. The most important reason people chose Toodledo is:
It's possible to create a to-do item by sending or forwarding an email.
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 Never forget an important email
Stay on top of what's current with due date reminders. Focus on your work, Flow-e's got your cues covered!
Pro Visualize your calendar
Your daily schedule is visualized in a timeline. Setting up meetings and reminders without leaving your mailbox is a click away.
Pro Email + Task Management
Designed for managers, Flow-e takes you to Inbox zero and beyond by turning your Gmail or Outlook mailbox into a visual taskboard. Personal tasks and emails are now managed from your mailbox in a visual workflow, customized for your process.
Pro Track your delegated tasks
Delegate work to your team without leaving your inbox and without sacrificing accountability.
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 Mobile Application
There is a lack of Mobile application. However, the Flow-e team says that it is coming in 2018!
