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Graillon 2 Free Edition is the top-rated free autotune in the market. Known for its efficient and user-friendly pitch correction module, it's compatible with any digital audio workstation that can load VST and AU plugins, on both Windows and macOS. It offers a simple autotuning process for vocals, with additional features for users who require more control. Users can limit the note range to specific scales, adjust the pitch correction speed, and define the note detection range. The flexible pitch correction engine allows for a range of sounds from artificial to realistic, with the mix knob offering further control over the autotune impact. The software also enables unique vocal effects like mixing dry and autotuned signals or adding pitch shifting with preserved formants to thicken vocals. With the recent release of an updated version, it now features a resizable user interface, making it adaptable to various screen sizes.

GSnap is a pioneering freeware autotune plugin that stood as the first free autotune VST in the market. Despite its age, it remains an effective pitch correction tool, similar in design and features to Graillon 2 and MAutoPitch. Its standout feature is the ability to tune the processed audio signal according to the MIDI notes inputted by the user, eliminating reliance on automatic pitch detection. However, it also boasts a robust automatic pitch detection algorithm, even without the formant shifting features present in some competitors. GSnap is exclusively compatible with Windows-based systems and comes with a comprehensive manual for users. It is a reliable option for those seeking a free, user-friendly autotune effect.

MAutoPitch is a robust and flexible autotune plugin. As an alternative to Antares Auto-Tune and Graillon 2, it offers comparable pitch correction features along with additional tools like stereo width adjustment, automatic gain control, and a limiter. This free tool is user-friendly with adjustable speed, range, scale, and depth, and includes a stereo widening feature useful in vocal processing. However, it has a complex installer and its interface is slightly less intuitive than Graillon’s. Despite these minor drawbacks, MAutoPitch's versatility and compatibility with all VST and AU plugin hosts on PC and Mac make it a potential favorite for pitch correction.