Usability
Interface 
User-friendliness/complexity of the tool´s interface
Intuitive, modern.
Time efficiency Time needed for mastering the „how-to“ of the tool and a production of a task
High.
Interface language(s) The number of languages in which the tool is currently available/adaptable to
English + 14 other languages.
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. Square, Weebly’s developer collects personal information such as financial, tax, and identity information for providing its services, preventing fraud, and complying with legal obligations. It shares some data with service providers, third-party analytics services, advertising partners, affiliates, and law enforcement agencies. Square has different security measures in place, including administrative, technical, and physical safeguards. It acknowledges users’ rights to access, delete, and correct personal information, as well as opt out of targeted advertising. Square implicitly states compliance with the GDPR. See more here.
Saving work for future use Possiblity to save your or others´ work for reuse/reproduction
Yes; users can access later versions of the same website through their account or an access code.
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)
To some extent; users can employ Weebly to create different types of websites.