When comparing Firetask vs Momentum, the Slant community recommends Momentum for most people. In the question“What are the best GTD apps?” Momentum is ranked 10th while Firetask is ranked 34th.
Ranked in these QuestionsQuestion Ranking
Pro Easy to use
Simple enough that a child can easily learn to use it. New tasks are quick and easy to enter.
Pro Many options for timing repeating tasks
Pro Shows only the first task of a project
Keeps the app uncluttered.
Pro Made to match GTD methodology
All of the steps are built into the app with no tweaking needed. For example, tasks can be assigned a context as well as a project.
Pro Excellent customer service
Company responds quickly to questions and is helpful and attentive.
Pro Specifically designed for GTD
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.
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 Only available for Apple products
Con High price point
However, a fully functional free trial is available.
Con Not as full-featured as OmniFocus
Con Cannot share tasks with others
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.