Hello,
I created a project for training and analyzing your performance during contests: cp-trainer.com. I believe it has some unique features not existing in competitive platforms and can provide as a more sensible tool for training, especially for more experienced users. Below I will briefly discuss its functionalities:

Problem recommender

Contest training picker

User stats

Compare yourself against the others

The idea for this section was to analyze for the user, how much

Summary

The goal was to create the tool which will analyze user's performance during real contests and then based on that propose adequate problems for training. Most of the apps focus on the stats of the user also during practice, that in my opinion don't provide the best insight e.g. because outside the contest you have unlimited time and also you can look at editorial.

If you find any bugs, please let me know and I will try to fix them as soon as possible. Any constructive criticism is also appreciated. Thanks for checking out the platform.