GT STATS is the most user friendly tennis analytics app. Latest updates include Star Stat for more customisation, and Actual Rally Length to identify rally pattern data ACTUAL RALLY LENGTH GT has developed its own system to help players understand the importance of rally length data and how it impacts their patterns of play and their practice. Displaying winners/forced errors and unforced errors on a graph that applies Actual Rally Length allows you to see WHEN a player is doing well in a ral