Studio One is all about speed, and VocaTune fits right in. Drag it on, set the amount, and your vocal sits in tune while you keep building the song.
From the browser's Effects tab, drop it on your vocal track.
One knob: Natural, Light, Studio, Extreme.
Bounce or transform when you're happy with the sound.
Yes, and you can save your own per artist so returning sessions start where you left off.
Your licence covers two of your own work machines.
The browser version is free and takes about thirty seconds. If you love it, the plugin has a 14-day free trial, then $79/year or $299 lifetime.