These are applications for Android OS that I find very useful in my day-to-day practice. Click on the app logo to go to the page to download it.
Tempo Lite: Tempo gives you the features you need without sacrificing usability. Its engine is written from the ground up for high accuracy and stability. Over that is wrapped an attractive and comprehensive single-screen interface. Flashing LEDs also serve as buttons to customize beats, enabling the creation of complex rhythms. Developer website
Tempo: All of the features of Tempo Lite and many more. No ads, interchangeable themes, the ability to save your configurations as songs in setlists and share them with friends, including those using iOS devices, and more!
Time Guru: The only metronome with the ability to mute its sound at random, in sequenced patterns, or both, so that you can assess whether you tend to rush or drag or loose your place with odd meters. Time Guru can periodically leave you on your own so that you strengthen your own internal sense of time, rather than relying on the constant, rigid, external time keeping of a metronome.
Drum Beats+: Drum Beats+ is a simple and fun collection of drum loops for stress-free jamming and songwriting accompaniment. A typical drum machine requires you to make your own beats from scratch; not this one. Ranging from 1 to 4 bars in length, these drum loops are great for casual practice or exploring song ideas.
TonalEnergy: TonalEnergy Chromatic Tuner and Metronome is an all-inclusive application designed for the pro musician to the beginning player. Whether you play a brass, a woodwind, a string instrument, or any member of the guitar family, this application can help you improve your skills. It is so much more than just a tuner!
Tunable: Tunable is a chromatic tuner, tone/chord generator, metronome, and recorder that helps you learn to play steadily, in tune, and on beat. Featuring a unique “tuning history” display for visualizing pitch over time, Tunable is the perfect toolkit for beginning to professional musicians.
n-Track Tuner: Tune your guitar, bass or other instrument with n-Track Tuner. The spectrum analyzer provides a visual feedback of the notes played by the instrument and shows a small arrow to highlight the harmonic whose pitch the tuner is tracking.
Spotify: With Spotify, you have access to a world of music. You can listen to artists and albums, or create your own playlist of your favorite songs. Want to discover new music? Choose a ready-made playlist that suits your mood or get personalized recommendations. Without a subscription, you can listen to any playlist or artist on shuffle.
ImslpDroid: Download and visualize classical music scores from IMSLP (International Music Score Library Project – http://www.imslp.org). Downloaded sheet music can subsequently be accessed offline.