Developer Builds Free Offline Dual N-Back Trainer After AI Worsened His Multitasking Focus

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A developer noticed that relying on AI tools for parallel tasks was eroding his ability to concentrate on a single task, prompting him to seek cognitive training methods. He discovered Dual N-Back, a working memory exercise with mixed research backing, and explored existing trainers but found none fully met his needs. Gaps such as poor interfaces, unclear scoring, lack of adaptive difficulty, and mandatory sign-ups led him to build his own app. The resulting Dual N-Back trainer is free, offline-first, supports multiple languages, and stores training history locally without requiring an account. Initially built for personal use, the app has since attracted regular users, and the developer continues to refine it based on community feedback.

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