A free program for Android, by Cecropia Solutions.
When you first learn to play the violin, you will need to tune your instrument. But, in time, you will get used to it and will no longer need a tuner. However, a good tuner will still be a very useful tool.
In this app, we have developed an extremely accurate and easy-to-use tuner. So you will no longer need to use a separate app for tuning. You can use this app to tune your violin and also use it as a practice tool.
When you start to play, the app will display the note that you are playing on the screen. But, you can use a color scale to see which string you are playing on.