Usability
Interface 
User-friendliness/complexity of the tool´s interface
Straightforward, intuitive.
Time efficiency Time needed for mastering the „how-to“ of the tool and a production of a task
Medium; very high with the AI-powered presentation creator.
Interface language(s) The number of languages in which the tool is currently available/adaptable to
English + 8 other languages.
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. Prezi collects information only to fulfil its commitments and obligations to users. It also collects cookies and aggregated data to improve user experience. Prezi does not sell or share personal information for commercial purposes. It implements security measures such as encryption and others to safeguard data. Unfortunately, in its free version, Prezi does not allow setting presentations as private and thus can be accessed by anyone. Prezi acknowledges the rights to access, correct, and delete user data and limit its processing. It states compliance with the GDPR. See more here.
Saving work for future use Possiblity to save your or others´ work for reuse/reproduction
Yes, presentations are stored in users’ profiles.
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)
High; users can create prezi presentations using different functionalities and for different purposes.