Note and Key Signature Trainer (Treble,Bass,Alto,Tenor)

This includes bass, treble, alto and tenor clefs, unlike other fancier looking apps. You can test yourself on note names and all the major and minor keys. Substance over style. Mine has suddenly turned its display round 90 degrees and won’t go back to portrait mode.

Very flexible app. You can test key signatures in bass clef which can't be found in other more expensive apps. Design is a bit dated but overall it's a useful learning tool.

Note trainer works very well. It's a fantastic app which I have used to greatly improve note recognition and also to identify key signatures and their relative minors. Highly recommended.