This work aims to study two similar and competing tools for creating games, using Unity and Unreal Engine Development (UDK) as a comparison, through Nielsen's 10 (ten) heuristics, for your evaluation, this article being of Human Computer Interaction, to help the analysis of heuristics, the MCDA Macbeth methodology was used, and the scores of both tools were balanced. With a difference of only 5 points, while the Unity tool had 209 points, the UDK tool had 214 points. The Macbeth Methodology predicts the comparison of each one of the 10 heuristics against all the others, indicating binarily which one is the most important, always assigning 1 the most important between the two in comparison and zero the least important. Then the sum is made and the highest score is assigned Very strong, followed by Fleet, Weak and Very Weak, establishing intermediate ranges of points. So after this calibration and summation, there was a difference of 5 points only between the two tools. So it can be concluded that both Unity and UDK tools are great tools for game development, each tool has its purpose and function, excelling in specific things, but in general, they are very similar. Unity is aimed at the more lay user and the UDK is aimed at professionals in the area, with both tools operating in the same market segments.