I have used Xert and intervals.icu, but in the end stopped using them. I never found the analytics to be particularly helpful in organizing my training or predicting my performance. The workouts in Xert are inferior to those in SYSTM.
TP is not similar to Xert or intervals.icu. It is a training diary, the real analytics are in WKO which is an entirely different product. As I replied to you in another post: