When comparing Asana vs Todo.txt, the Slant community recommends Todo.txt for most people. In the question“What are the best cross-platform task apps?” Todo.txt is ranked 9th while Asana is ranked 12th. The most important reason people chose Todo.txt is:
Todo.txt can be edited in plain text and then displayed with neat styles.
Specs
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Pros
Pro Powerful team collaboration features
Asana has fantastic mechanisms for dealing with team collaboration. Not only can tasks be assigned to team members, but Asana lets users follow tasks and use hyperlinks to refer to team members within a task.
Pro Free for up to 15 users
Pro Simple workflow
The Asana task workflow within a project is broken down into "Today," "Upcoming," and "Later." The tasks themselves have the status of either done or not done. There is also a subtask feature to group tasks together. Tasks can be assigned to other team members and are stored in the "Inbox" view for processing. This replaces email for some team communication.
Pro CSV export and print
Pro Very polished interface
Teams can have private (only visible to project members) and public (visible to anyone in the team) projects. Each member can also have their own personal projects.
Tasks can be viewed in list and calendar views. It's possible to display only the tasks assigned to the user or tasks organized by project or team. Single tasks can exist in multiple projects. Lists of tasks can be divided into sections and organized in many different ways – tasks that still have to be done, tasks that have been completed, by due date, by assignee, by popularity, etc.
Expanding a task will allow adding things like subtasks, tags, and attachments, as well as comments. Users can also subscribe to a task via RSS from this view. There's a separate view specifically for attachments.
Search lets you find what you’re looking for quickly.
Pro Tagging system allows easily filtering tasks
The tagging system enables project managers to easily filter tasks.
Pro Provides lots of help for getting started
There are many videos, tutorials, and reference documents to help you get up and running.
Pro Supports Kanban and list views
Asana provides a list view and a Kanban view which can be selected if a new project is created.
Pro Well thought out keyboard shortcuts
Keyboard shortcuts all involve the Tab key, so it is unlikely that they will interfere with shortcuts that have already been established.
Pro Integrates with Slack
It's possible to have tasks appear in a Slack channel.
Pro Easily editable format
Todo.txt can be edited in plain text and then displayed with neat styles.
Pro Editable from any text editor without needing any proprietary software
Because todo.txt is just a todo standard with various compatible apps to edit it, you can update it from any device as long as it can edit text and you can access your todo.txt file
It's convenient to be able to access your todo list quickly via your programming environment so you don't have to switch contexts, and to have a separate todo.txt file per project.
Pro Works with lots of apps for every platform
Todo.txt lists can be edited in virtually every text editor ever made and accessed on devices that support Dropbox. The user community has also created a number of apps for dozens of platforms.
Pro Command line support
You can edit your lists using the command line (e.g., Terminal) via a supplied bash script.
Pro Full control over your to-dos
You have full access to the underlying programming rules, and therefore total control over your task lists.
Pro Extensible
Has been extended to include most things people want, including a multiple of interfaces and app for all platforms.
Pro Easy syncing
Todo.txt automatically and seamlessly syncs through Dropbox.
Pro Wide range of interface apps
The community has developed a wide range of apps that interface with the basic file structure. These apps vary in how much they accomplish, how much hand-holding they do, their level of glitz, etc. They range from plugins for an editing app like vim to stand-alone, platform-specific GUI's. So YMMV depending on what you use. (todopy is particularly nice, a Python program that has a "console" mode which provides a keyboard-driven GUI.)
Pro Follows the unix philosophy
Does one thing: to do lists
Pro It's free
It runs on MacOS, Android, and Python (in the Mac's Unix CLI) -- all for free.
Pro Easy to sync up between lots of devices and interfaces
At a bare minimum you just need to be able to edit text, but there are many apps and advanced interfaces you can install on many devices to supplement your to-do list editing.
Cons
Con Mobile version lacks calendar
Asana's calendar is present in the web version but is conspicuously missing in the mobile app.
Con Unable to manage multiple workspaces
Each "workspace" or "team" in Asana is strictly isolated. You cannot see your personal tasks versus work tasks or collaborations together, you need to log in to a different profile.
Con No task dependencies in free version
Dependencies is only available only to Teams and Organizations on Asana Premium.
Con Can not use list view and board view for a same project
Asana can only choose one, either a list view or a board view.
Con Strange UX with strange workflow
Similar to task the manager in Todoist or Wunderlist, but not too complex for under four members.
Con UX Design is overly opinionated
The workflow is not very customizable, which forces you to use a flow that may not be your preferred or best option.
Con No support for reoccurring tasks
Tasks have dates corresponding to creation and completion, but there is no explicit support for due dates or for tasks that reoccur.
Con Nested tasks not supported
Many todo tasks for developers end up having sub tasks that need to be performed for a parent task to be completed, but the todo.txt format does not have any nesting.
Con Android app not updated since 2013
The app only seems to support Dropbox. It would be nice to see support for different and newer file storage services.