UD Tuner is a tool for tuning Turkish/Arabic musical instrument Oud. It can also tune instruments cumbus, tanbur and lute *It can listen to instrument sound and measures the sound frequency. So it gives directives for finding the correct tune. * It can run in two modes with manual string selection and auto string selection *It can also produce reference sounds when touching the strings on screen * you can reach 0.01Hz professional sensitivity in a silent room * it is a paid app, so you just buy the app, it doesnt run in subscription or auto-renewal mode. You just pay only once