Usability
Interface 
User-friendliness/complexity of the tool´s interface
Straightforward.
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.
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. UsingEnglish collects both information that users provide directly (such as contact data, credentials, demographic data, and content) and information that is automatically collected when using the service (such as service use data, device connectivity and configuration data, and location data). This is done to manage the service, provide customer support, enhance products and services, personalise content, and serve tailored advertisements. Also, it collects cookies for various purposes, including tracking visitor behaviour and compiling statistical reports. Users are provided information on how to manage cookies in their browsers. UsingEnglish mentions employing appropriate security measures, including administrative, technical, and physical precautions. It acknowledges users’ right to request access to their information. UsingEnglish complies with the GDPR. See more here.
Saving work for future use Possiblity to save your or others´ work for reuse/reproduction
Yes, users with an account can save exercises and quizzes.
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 filter through thousands of resources per topic and level to find something that adapts to their needs.