GuitarTuna is the most useful and accurate guitar tuning platform. The app has 100 million+ downloads so far and has 10 million+ active users. Also, it is one of the most rated platforms on PlayStore and AppStore. It has received 4.7 stars and people enjoy using this app. 
GuitarTuna works effortlessly and rapidly. You don't need to wait for this app to tune your guitar. It tunes more than 15 instruments. The app is perfect for beginners learning guitar and professionals. Kids can use it too. Also, GuitarTuna is designed by professional guitar players who are experienced. Audio engineers have worked on its accuracy and millions of users have shared their love for this platform. Best platform for musicians.