User friendly, has a great manual for explaining all of its interfaces and functionalities

G Power is straightforward. I have been using it before conducting research to estimate how many participants I will need. It makes this process easy to understand statistical power.

G*Power was straight forward, easy to use, and user friendly for someone who is not a statistics expert. It allowed me to conduct an a priori power analysis to determine an appropriate sample size for my research study. I did not have the ability to hire a statistician to do this for me, so this resource was really helpful. The website also provides a ready-to-use citation.