The marketing sector of Yogurts has been growing in Brazil, especially with the introduction of the new product called “Greek Yogurt”. The objective of this work was to evaluate if there were significant sensory differences between two brands of commercial Greek yogurt red fruits flavored. The brand number 1 is the leader in the market and brand number 2 is one of the competitors in the segment. The tests were fielded using individual booths at the Food Sensory Analysis Laboratory at the Federal Rural University of Pernambuco (UFRPE). Two difference tests have been performed, Paired Comparison and Duo-trio. In both tests the samples were served in plastic cups with three-digit randomized codes. In Paired Comparison test an error type α = 0.05 and β = 0.2 and in the Duo-trio test an error type α = 0.05 and β = 0.3 were assumed. There were selected 30 evaluators non-trained according to the table regarding minimum numbers of correct judgments to establish significance at various probability levels for paired-difference and duo-trio tests and fitting the criteria of available time and the like/use of consumption of Yogurt. The evaluators were students and Professors from the University itself. In the Paired Comparison test the evaluators answered the question “Which one is sweeter?”, as well as in the Duo-trio test the question was “Which sample is the different one?”. According to the table above mentioned, the required minimum number of correct answers to identify differences is 23 to Paired Comparison and 20 to Duo-trio test. In the experiment 23 correct answers were obtained in the Paired Comparison test and 24 correct answers in the Duo-trio test, agreeing with the minimum required number for these tests to establish significant difference, concluding that there are significant differences between the two Yogurt brands.