Usability
Interface 
User-friendliness/complexity of the tool´s interface
Intuitive, easy to navigate.
Time efficiency Time needed for mastering the „how-to“ of the tool and a production of a task
Medium.
Interface language(s) The number of languages in which the tool is currently available/adaptable to
English, Spanish and Dutch.
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. Symbaloo collects personal information, including names, email addresses, countries, and language for the operation, support, and improvement of their products and services, together with user customisation and communication. It also gathers cookies for different purposes, among which marketing, and shares some information with third parties for reasonable purposes. Symbaloo also features advertisements. It has put into place diverse security safeguards, including encryption and access controls. Users can manage cookies to a certain extent and can manage their data through their account settings, with the possibility of requesting data or objecting to data processing. Symbaloo states compliance with the GDPR. See more here and here.
Saving work for future use Possiblity to save your or others´ work for reuse/reproduction
Yes, with an account.
Tailorability (If so, how?) Possibility of the tool to be used for a range of different activities (e.g. to what extent you can organize a project assignment with a central activity based on this tool)
Medium; users can bookmark any website into their Symbaloos.