If GSnap is too robotic for you, try by MeldaProduction. It’s free, has a beautiful interface, and offers a "depth" control that lets you blend the dry (raw) signal with the wet (tuned) signal.
Your voice will snap instantly to the nearest note. This sounds robotic and artificial—perfect for hip-hop, hyperpop, or comedic effects. can you autotune in audacity
Best for the "T-Pain" sound or heavy robotic tuning. If GSnap is too robotic for you, try by MeldaProduction