Usability
Interface 
User-friendliness/complexity of the tool´s interface
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, German, Spanish, French, Portuguese, Russian, and Italian.
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. TimeGraphics collects non-personally identifying information such as browser type, language preference, and IP address. It gathers personally identifying information too, such as usernames and email addresses, when users interact with the service, mainly to fulfil the purpose of user interactions. TimeGraphics does not rent or sell user information to third parties. It uses cookies to identify and track visitors, monitor website usage, and collect access preferences, but users can opt out of them. Also, it mentions that potentially personally identifying information is stored on restricted database servers. TimeGraphics acknowledges users’ rights to access and correct data, together with requesting data deletion, objecting to data processing, and withdrawing consent. It 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 create and save timelines.
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 create timelines for different purposes using TimeGraphics.