A new Android app called BSharp aims to teach perfect pitch to young children using a color-based chord identification system. Unlike adults, children under age 6 can develop absolute pitch through proper training methods. The app presents piano chords with associated colors, starting with just two chords and gradually expanding to nine white-key and five black-key chords.

Built on Eguchi's chord identification method documented in Psychology of Music research, the system requires children to listen to chords and tap matching colored flags. Parents should practice 5 sessions daily for 2-3 minutes each, with new chords introduced only after 100% accuracy on current ones. The approach associates specific colors with chord types: red for F/C, yellow for G/B, blue for F/A, and so on through brown for C/G.

An adaptive weighting algorithm adjusts difficulty by presenting harder chords more frequently based on performance data. Multiple user profiles track individual progress across different children. The app derives from Paul Ganssle's open-source CIM Trainer but operates as a separate tool under the Apache License 2.0.

Development requires Node.js for building and Android Studio for deployment. This represents a practical application of music cognition research, potentially giving musically-gifted children an early advantage through scientifically-backed training intervals.