When comparing Doit.im vs Momentum, the Slant community recommends Doit.im for most people. In the question“What is the best cross-platform to-do list app?” Doit.im is ranked 44th while Momentum is ranked 45th.
Ranked in these QuestionsQuestion Ranking
Pro Quick add from notifications
Pro Low cost
Subscription value is generally lower than other platforms.
Pro Daily review which allows for did-take VS should-take time comparison
A built-in daily and weekly review function that lets you compare the estimated time for tasks against the actual time they took, as well as productivity for the day/week.
Pro Free apps for Android, iOS, Web.
Pro Clean, simple layout
The apps borrows some design elements from Material Design-type design, which uses a slide-out menu. Everything is laid out in an easy-to-find manner.
Pro Automated Next Steps
Next steps have a separate view. Tasks can be updated sequentially or parallel.
Pro Projects and Tasks can be endlessly nested
You can nest multiple projects with tasks, there is no limit.
Pro Has an offline mode
No permanent internet connection needed.
Pro Specifically designed for GTD
Web-based, progressive-web-app (PWA).
Pro Realtime synch
Data instantly updates on all devices.
Pro Clean design
Lots of space helps focus on the tasks.
Con Nonexport and support desk say they will never include it (your data is theirs now)
Con Support non existing
Con Offline sometimes
Con Subscription based
While not expensive, it does cost money to get it for Mac or Windows (although you can view it in the browser for free). The subscription also adds automatic cloud sync, sync with Google calendar, adding tasks via email, manual sort, attaching Evernote into tasks, and more.
The subscription costs $2/month, or $20/year which is very reasonable
Con Rarely updated
Con Sometimes it doesn't see your active subscription
Con Not very customizable
There is no way for you to create your own "perspective".
Con Beta interface is confusing for first-timers
The interface is very opinionated (this is a good thing). But it is not obvious how to map user's own GTD variant onto the one the author has in mind. Maybe after it is in production, there will be better on-boarding.