When comparing Diigo Outliner vs Checkvist, the Slant community recommends Checkvist for most people. In the question“What are the best browser-based to-do list apps?” Checkvist is ranked 7th while Diigo Outliner is ranked 16th.
Ranked in these QuestionsQuestion Ranking
Pro Links can be added from anywhere
Links can be added at the bottom of the outline from any web page, using Diigo's bookmark functionality.
Pro Nice-looking pasted URLs
Pasted URLs automatically turn into href links named with the title of that page
Pro Easy to organize ideas, tasks, links and notes hierarchically
Pro Tasks can be managed with custom tags
Pro vim-like commands
Pro Convenient search by text or tag filtering
Pro Converts incoming emails to todos - this is a way to enter tasks from anywhere.
Pro Great search
Search filters help you search for tasks by tag, due date, assignee, etc.
Pro Very flexible
To-do lists often need to be grouped and regrouped for clarity. The outline-based nature of Checkvist makes it easy to move things across categories, to increase and decrease priority, etc.
Pro Smart parsing of items
Parses markdown, html links, hashtags to become formatted text, clickable links, and tags, respectively.
Pro Generous set of free features
Checkvist offers many free features if you are using this individually.
Pro Supports comments on tasks
Any item can have a free-text comment, which can be shown or hidden as desired.
Con Impossible to add links, items and notes by email
Con Limited capability in the android app
Checkvist is primarily a web interface.