
To this day, GSnap is still a great in terms of features and design. It was the original freeware VST plugin that accomplished the classic autotune effect. One of the first free pitch correction plugins, GSnap, is among the best.

It requires a monophonic input signal to operate.

It can be used subtly to correct the pitch of a vocal, or, with more extreme settings, to create a robot-voice effect. Go to Effect → Add / Remove Plug-ins… → Click on ο New in the Plug-in Manager: Effects, Generators and Analyzers dialog box → Select GSnap → Click Enable → Click OK. GSnap can be used with Audacity on Windows, macOS, and Linux devices.

GSnap is a free Audacity plug-in that can help you autotune your audio files.
