Auburn Sounds Graillon 3 vs OpenTune

Auburn Sounds Graillon 3 is a live vocal processor and pitch-correction plug-in for shaping standard or edgy vocals. Its pitch tools include pitch shifting, formant shifting, pitch correction, and three engines: G2, G3, and I1. A compressor, gate, chorus, preamp, and bitcrusher are built in; Auburn Sounds says the vocal-tuned effects add no latency. The free edition includes the pitch features and effects. The Full Edition adds Pitch-Tracking Modulation, keyboard tuning, a vocal doubler, and 20 more presets. Graillon supports CLAP, VST3, VST2, Audio Unit v2, AAX, LV2, and FLP formats on Windows 7 or newer, macOS 10.15 or newer, and Ubuntu 22.04 or newer. Listed host software includes Pro Tools, Cubase, Logic, Live, and FL Studio. The Full Edition costs $29.00 USD or more as a one-time purchase. The maker states there is no subscription or update fee. Session compatibility is maintained across minor version changes, but may break across major changes.

OpenTune is a free, open-source vocal pitch correction tool for macOS and Windows. It regenerates vocals with a neural vocoder while preserving formants, and offers hand-drawing, note, and anchor tools for pitch editing. Automatic key detection supports Chromatic, Major, Minor, Pentatonic, Dorian, Mixolydian, and Harmonic Minor scales. Per-note EQ provides another way to adjust individual notes. The software imports WAV, FLAC, OGG, and MP3 audio and is available as a standalone executable or a VST3 plugin with ARA2 support. Its AI engine combines FCPE pitch extraction with a PC-NSF HifiGAN vocoder and ONNX Runtime inference. GPU acceleration uses DirectML on Windows and CoreML on macOS. The interface supports Chinese, English, Japanese, Russian, and Spanish. OpenTune is permanently free and licensed under AGPL V3.0. On macOS, release packages use ad-hoc signing without Apple notarization, so the first launch may show a developer verification prompt.