At first, we reached out to a blogger with a request to organize week-long marathons. At that time, we needed to change the format of the event because the number of participants was increasing, and Telegram was no longer able to handle the tasks we set. So, we decided to try coreapp. Although not all the tools turned out to be useful for us, we still found several advantages. All of them are related to the ability to upload an unlimited amount of content before the start and the absence of restrictions on the number of students. Now we are considering a larger project, as we plan to create an online language school, so we will be exploring available options on a different plan. Overall, we like everything, and we continue our collaboration.