Tatool Web was developed to assist researchers with programming training software, experiments, and questionnaires. In its original version, Tatool was developed as a Java-based open-source framework. But, the vision of Tatool is that computer-based experiments should be an easy task to do - for more experienced researchers but also for students and research assistants. The main goal of it was, therefore, to make it easier. Tatool comprises features crucial for training studies (e.g., configurable training schedules, adaptive training algorithms, and individual training statistics) and allows for running studies online via Java Web Start. Tatool is published open source under the GNU Lesser General Public License.