Both of these examinations assess your command of the English language, which may be necessary for enrollment in an international institution or university. It is not the case that the Duolingo English Test is less difficult than the TOEFL. This exam uses an adaptive algorithm to assess a candidate's English proficiency. When you look attentively at the Duolingo English Test example questions, you will see that they adjust to the candidate's level. The applicants' preparation and language proficiency determine the difficulty level of each of these tests.