Tuner Ninja
This is a chromatic instrument tuner which is using your microphone to record and detect pitch of musical notes played on your instrument.
Most of other tuners are either not working, or working only on specific devices. Ninja Tuner is cross platform tuner accessible from wide range of devices. It works on almost every new browser across all operating systems. Users on Android device can add it to their home screen, and it will take less than 1MB of the device storage.