MAutoPitch by MeldaProduction (VST/VST3/AU/AAX)

MAutoPitch is in no way a less capable Antares Auto-Tune alternative than Graillon 2. Whereas the pitch correction features are roughly the same between the two plugins, MeldaProduction’s product adds a few bonus tools like stereo width adjustment, automatic gain control, and a limiter. The pitch correction algorithm is flexible, with adjustable speed, range, scale, and depth. The added stereo widening feature can be a neat bonus in a vocal processing chain, but do make sure to double-check your mix in mono when using it.
That said, the main reason why MAutoPitch isn’t the highest ranked autotune effect on this list is the fact that it comes with a rather cumbersome installer. All MeldaProduction’s freeware plugins, including MAutoPitch, are packed into a single installer file. This results in unnecessarily long download times and a somewhat cumbersome installation procedure. Also, the plugin’s user interface is slightly less intuitive than Graillon’s, but your mileage may vary.
Those few drawbacks aside, MAutoPitch is a brilliant free autotune VST plugin that could quickly become your go-to pitch correction tool. Just as Graillon 2, it is compatible with all VST and AU plugin hosts on PC and Mac.
Download: MAutoPitch (32-bit & 64-bit VST/VST3/AU/AAX plugin format for Windows & Mac OS)

MAutoPitch is in no way a less capable Antares Auto-Tune alternative than Graillon 2. Whereas the pitch correction features are roughly the same between the two plugins, MeldaProduction’s product adds a few bonus tools like stereo width adjustment, automatic gain control, and a limiter. The pitch correction algorithm is flexible, with adjustable speed, range, scale, and depth. The added stereo widening feature can be a neat bonus in a vocal processing chain, but do make sure to double-check your mix in mono when using it.