2025/08/15：V2.3　Fixed the problem
2023/08/22：V2.2　Fixed the problem
2023/08/22：V2.1　Fixed the problem
2021/12/12：V2.0　Add animation
2021/11/27：V1.8　View training results
2021/02/13：V1.7　Fixed the problem
2021/02/13：V1.6　Fixed the problem
2020/09/17：V1.5　Fixed the problem
2020/08/29：V1.4　Fixed the problem
2020/07/17：V1.3　Fixed the problem
2020/07/04：V1.2　Fixed the problem
2020/06/13：V1.1　Fixed the problem
2020/06/13：V1.0　Released perfect pitch training app.