KeroVee

KeroVee is another old-school pitch correction tool, released way back in 2010. Although it looks less modern than the previous three autotune VSTs on this list, KeroVee’s feature set is on par with the competition. It also features the MIDI input mode seen in GSnap. Although MIDI input isn’t required for that classic “T-Pain autotune effect,” the feature is convenient if you want absolute control over the vocal pitch.

In a way, KeroVee is closer to Celemony Melodyne than Antares Auto-Tune. However, KeroVee can also operate in automatic “free autotune” mode, like Graillon 2 and MAutoPitch. One area in which KeroVee doesn’t shine is system compatibility. It will only work as a VST plugin in Windows-based digital audio workstations, so Mac users are out of luck. If you use an older Windows DAW, KeroVee could be the best option for a gratis autotune plugin.

It uses almost zero CPU resources and works excellently on older 32-bit systems.