With this application you will be able to put your intervailing skills to the test and carry out an appropriate and detailed level tracking through graphs strategically arranged by type of interval and order of practice. The application is universal, that is, it covers all types of intervals in all the tones (Major, Minor and Increased), 4 types of practice order (Chromatic or 2m, 4th, 5th and Random or Random), also has graphics of level auto updables and ordered by category. The system is able to be programmed with question from the bass or question from the interval. Smart Interval is undoubtedly the best professional and objective proposal for musicians who seek to keep their mental skills in shape and ready for any situation that arises. Not only is it a beautiful app and it adapts to any device but it is terrifyingly useful. Try it and feel the difference from the first practice sessions.