AI made it possible for me to run more tasks in parallel, but I became worse at focusing on any one of them. Here is why the existing trainers did not work for me and what I decided to build myself. If you want to see what I ended up with first, try my trainer. How Multitasking Became a Problem In my work, I constantly switch between different tasks and often work in multitasking mode. Strangely enough, AI tools have only made this problem worse for me: they allow me to run more processes in parallel, making it even harder to keep my attention on a single task. Why Dual N-Back? I began looking for exercises that could help me train my working memory and concentration. That is how I discovered Dual N-Back and started reading the research around it. The results of these studies are mixed, so I did not treat the method as a magical way to increase intelligence. I simply wanted to find a regular and measurable exercise and test it through my own experience. Why Existing Trainers Did Not Work for Me I then explored the existing trainers. Each of them had interesting ideas, but none completely satisfied me. Some had interfaces I did not like, some used scoring systems that were difficult to understand, and others lacked adaptive difficulty, an offline mode, or the ability to train without creating an account. In the end, I decided to build my own trainer: Dual N-Back App trainer Try the current version of Dual N-Back for free and without signing up. What I Built and What Is Still Ahead I combined the things that were personally important to me: a calm, modern interface, clear performance metrics, adaptive difficulty, a local training history, and the ability to use the trainer without mandatory registration. The trainer is currently completely free, supports multiple languages, and its core features are available without an internet connection. Training results are stored locally on the device. I am also working separately on optional synchronization between devices. I originally built this project for myself and expected almost nothing from it. That is why I was surprised when other people started using the trainer, and some began returning to their training sessions regularly. It is especially rewarding to see people continue practicing and gradually improve their results. If you decide to try the trainer, I would be glad to receive your feedback. I am especially interested in whether the first-run experience is clear, whether the scoring system is easy to understand, whether the difficulty feels right, and what you think is missing. I continue to actively develop the project and pay close attention to thoughtful suggestions. Try the trainer for free without signing up and share your impressions →