This is an application that makes it easy to transpose note names.
A total of 12 keys can be selected for the transposition source and transposition destination keys.
How to use
1. Select the transposition source and transposition destination keys.
2. Enter the note name you want to transpose.

You can transpose up to 8 notes, and after transposing, you can reselect the keys of the transposition source and transposition destination.
For example, you can transpose from C to B ♭ and transpose the same note to E ♭ in one operation.