Can I write Doulingo instead of TOEFL and IELTS?

1,326 universities in the USA accept Duolingo test scores for enrolling students. Some of these reputed institutions are listed below– 

Yale University - minimum score 120

Harvard University - minimum score 125

Cornell University - minimum score 120  

NYU Stern School of Business - minimum score 120  

Massachusetts Institute of Technology - minimum score 120 

University of California Berkeley - minimum score 115

University of Pennsylvania - minimum score 120 

Johns Hopkins University - minimum score 120

You need to check the universities accepting the Duolingo score as well as catering to your choice of course. 

If you need any help with the same, just let me know what course do you wish to pursue and also if you have any country preferences. I shall then help you with suitable information.