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
Medium.
Interface language(s) The number of languages in which the tool is currently available/adaptable to
20+ languages.
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. Skribbl collects personal information when users provide it for performing contractual obligations. Also, it collects cookies, among which targeting or advertising cookies. This user data is shared with various entities, including customer relationship management software, service providers, partners, and third parties, for purposes like providing information, products, services, marketing, or legal compliance. Skribbl takes appropriate technical and organisational measures to secure user data against unauthorised or unlawful processing, accidental loss, destruction, or damage. It acknowledges users’ rights to access, rectify, or erase their data, together with the possibility to withdraw consent. Skribbl states compliance with the GDPR. See more here.
Saving work for future use Possiblity to save your or others´ work for reuse/reproduction
No.
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)