Good apps for TUNING:
SOUNDCORSET - free for both apple and android. This is the app in the video. Not my favorite, but it picks up pizzicato better than the ones below. Also includes drone pitch to tune, metronome, and recorder.
TEMPO - I use this exclusively for metronome and tuner. Tuner only has drone tone, not the moving chromatic needle.
TUNER LITE by Piascore (free) - Has chromatic needle tuner and drone tone (only for iphone)
CLEARTUNE (paid) - similar to TUNER LITE but better. Has chromatic needle tuner and drone tone.
Metronome-Plus: also good. Only drone tone.
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