Pitchproof

Pitchproof, by Aegean Music, is a free pitch-shifting and harmonizing plugin styled after classic guitar harmonizer pedals. It shifts the input up or down by fixed intervals, or generates intelligent harmonies that follow a musical key, while keeping the character of the original signal intact.

Features

• Blend control to mix a fully shifted signal with the dry signal, for harmony-style effects.
• Pitch menu with fixed intervals (e.g. +7, -7) and key-aware harmony modes.
• Key selector so the harmony engine follows the major/minor scale you’re playing in.
• Detune control for subtle, natural-sounding thickening.
• Mono mode (lower CPU use) or full stereo processing.
• Transient Fix option to preserve sharp attacks — useful on percussive input, less noticeable on slow fade-ins like pads.
• Built-in guitar tuner, since the plugin already tracks pitch internally.

Compatibility

Available in VST / VST3 / AU / AAX, for Windows & macOS, 32 and 64-bit.

Source : aegeanmusic.com