Size test vs Dual N

This app is designed to assess how quickly the user reacts to changes in the size of an object. Users can select one of the test modes: 'Increasing the object', 'Decreasing the object', 'Decreasing or increasing the object'. When the user observes a change in the size of an object, the user must break contact with the device screen. The recorded test time reflects the user's ability to perceive the change in object size. Once the test is completed, the results are tested for normality of distribution (Shapiro-Wilk test). If the values deviate from the law of normal distribution, the program analyzes the data sets, removes the worst value and adds an additional attempt. In the program settings you can select the number of attempts - from 10 to 30. The choice of the number of attempts depends on the performer's age and professional activity. In addition, in the program settings the user can save a backup copy of his measurements in JSON format anywhere (Save backup), add measurements from another device (Add backup), replace already saved measurements with new ones (Replace backup) or delete all data (Delete all data). This application is intended to be used by athletes and teachers in specialized educational institutions for scientific research.

Designed for structured cognitive training, Dual N-Back challenges your working memory daily and helps you build sustained focus over time Dual N-Back is one of the few cognitive tasks studied in academic research with evidence suggesting improvements in working memory and fluid intelligence when practiced consistently. This app gives you a precise, distraction-free training environment plus the analytics you need to measure real progress. What you’ll get - Adaptive Dual (visual + audio) and extended modes, the app automatically raises N-level as you improve. - Session metrics: N-level, Accuracy (%), Mean Reaction Time (ms), track what's changing, not just how you feel. - Long-term charts & heat map (Premium): accuracy trends, reaction time improvements, N-level distribution and calendar streaks. - Guided Plans: 4-Week Boost, Daily Micro-Sessions, and Research-Mode for lab-style protocols. - Clean, low-distraction UI (Dark/Light), ergonomic controls for thumb response. - Customizable training environment, adjust voice, haptics and stimulus timing to match your preferred intensity. Freemium model & Honeymoon trial Enjoy full Premium access free for the first 3 days and experience the complete training system, unlimited sessions, ad-free focus, and advanced analytics that reveal your long-term cognitive growth. Premium unlocks detailed progress history, deeper performance insights, and structured plans designed for serious improvement. Who it’s for - Students and professionals who want measurable boosts in focus and mental throughput. - Adults looking to keep their memory sharp with short daily practice. - High-performers and curious minds who treat cognitive fitness seriously. Start a practice streak today. Train at the edge of your capacity, measure real results, and make cognitive fitness part of your routine. Privacy Policy: https://greenbisonstudio.web.app/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/