No credit card required. After 7 days, it stops working unless you buy it.
If you absolutely need free real-time pitch correction, consider these open-source or freeware options. Note: None are perfect stereo replacements, but they handle monophonic vocals well.
If you use the trial or decide to purchase the plugin (often on sale for ~~~$199.00~~~ at retailers like Plugin Boutique or Waves Audio ), keep these tips in mind for the best results: