SUS4 Tuner

SUS4 Tuner is a chromatic tuner built around a strobe display. It is the same readout used in professional studio and stage tuners, now on your iPhone, iPad, Mac and Apple Watch. It reads the pitch your instrument produces, shows how sharp or flat you are against the target note, and lets you know the moment you lock in.

The strobe mode gives you sub-cent accuracy without requiring you to read a needle or a number. When the display stops moving, you are in tune. It is that direct. The app supports all twelve chromatic pitches across the standard equal-tempered scale and responds quickly enough to be useful mid-session without fiddling with settings.

Because SUS4 Tuner runs natively on Apple Watch, you can check tuning with a glance, useful if your phone is across the room or mounted on a stand. The Mac version docks into a corner of your screen during tracking sessions so reference is always a glance away.