Usability
Interface
User-friendliness/complexity of the tool´s interface
Easy-to-use, intuitive.
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
Several languages, among which English, Spanish, French, German, Italian, Greek, Brazilian Portuguese, Romanian, Polish, Hindi, Ukrainian, Russian, Korean, Hungarian, Turkish, Czech, Thai, Chinese, Arabic, Chinese, Japanese, Indonesian, Vietnamese, or Dutch.
Respect for privacy
Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. Duolingo collects the information necessary to process purchases, provide customer support, and run the platform, among which different types of device information, order information, and customer support information. It does not willingly collect data from users under the age of 13. Duolingo shares personal information with third parties if reasonably necessary to offer the Service but does not sell it. It also processes user data to show behavioural advertising. Duolingo uses cookies. Its privacy policy does not provide extensive details on security measures. Duolingo mentions lawful bases for processing personal information under GDPR, to which it complies. See more here.
Saving work for future use
Possiblity to save your or others´ work for reuse/reproduction
Yes.
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)
Limited; users must follow the pathway set by Duolingo, so there is a certain lack of control over what is learnt.