When comparing Diigo vs Tagpacker, the Slant community recommends Tagpacker for most people. In the question“What are the best ways to organize bookmarks?” Tagpacker is ranked 9th while Diigo is ranked 11th. The most important reason people chose Tagpacker is:
The company earns (enough) money with affiliate links, therefore there is no need for a purchasable pro membership.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Good mobile apps and browser add-ons available
Pro Tag, group and make lists of bookmarks
Pro Read later function
Pro Integrates with other web services like Twitter and delicious
Pro Sync bookmarks
Pro 100% free (at the moment)
The company earns (enough) money with affiliate links, therefore there is no need for a purchasable pro membership.
Pro Auto tagging
It makes tag suggestions based on your tags already used
Pro Follows strict privacy rules
Because it is located in Germany, the company has to follow very strict rules regarding privacy.
Pro Automate tasks with Zapier
Automating tasks with Zapier.
Pro API
Programatically access links and tags.
Pro Clean, efficient UI
Pro Date
It saves the date when the bookmark is added
Cons
Con Very slow and unresponsive development team
Con Privacy concerns
Developer company is from China, it's advisable to be careful.
Con Uses affiliate links, which can be seen as an invasion of privacy
Affiliate links are usually not only a way to earn money with advertisement. They also include generating user profiles, which could be seen as a big privacy issue.