When comparing Taskwarrior vs Doit.im, the Slant community recommends Taskwarrior for most people. In the question“What are the best cross-platform task apps?” Taskwarrior is ranked 2nd while Doit.im is ranked 43rd. The most important reason people chose Taskwarrior is:
The command line interface puts powerful filtering expressions, context, annotations, tags, due dates, reoccurrence, and user-defined-attributes totally in your hands. It’s fast and low friction.
Specs
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Pros

Pro Command line interface
The command line interface puts powerful filtering expressions, context, annotations, tags, due dates, reoccurrence, and user-defined-attributes totally in your hands. It’s fast and low friction.
Pro Extensible
Taskwarrior has many front-ends, services, extensions, hook scripts, and capsules available. Taskwarrior keeps a list of contributed tools on their site.
Pro Lightweight and fast
Taskwarrior is written in the speedy C++ language.
Pro Tasks stored in plain text files locally
Future-proof and easily integrated with version control system. You never lose access to your data.

Pro Sync across devices
When used in conjunction with the Taskserver, it can sync tasks (conflict-free) across your Taskwarrior devices. This includes integration with Mirakel.

Pro Supported internationally
It has UTF8 support and is translated into many languages.
Pro Customizability
Taskworrior allows you to define custom attributes and reports to your needs.
Pro Self-hosted Taskserver
You can be in full control of your data.
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 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 Low cost
Subscription value is generally lower than other platforms.
Pro Quick add from notifications
Pro Free apps for Android, iOS, Web.
Cons
Con Command line interface
A command line interface is a arguably overly verbose, consequently tedious, way to interact with a To Do list.
Con Support non existing
Con iOS version no longer being updated
iPad upgrades stopped at iOS version 11, so if you want to keep Doit.im it is not possible to upgrade to iOS12. As there is no export facility, you are stuck.
Con Rarely updated
Con Offline sometimes
Con Nonexport and support desk say they will never include it (your data is theirs now)
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 Sometimes it doesn't see your active subscription
Con Rip off
Con Not very customizable
There is no way for you to create your own "perspective".
