Is your intonation correct? This cannot be fully explored with a look at a tuner, because one corrects automatically and thus falsifies the result. This is exactly what you can do with the MyIntonation analysis app, because you dont have to keep an eye on it. Just start and play a few scales or your favorite song. MyIntonation shows you the maximum and average deviation in cents for each tone. This will help you identify the notes that you still have to work on.
Suitable for all instruments with player-dependent intonation and for singing voice.