PurpleWishingGate.com

Its great. Does everything you'd want in a review app. Make sure to check if the review snippet code installed so star ratings show on google search. Mine did not automatically get added.

Does exactly what it says it will. This is the only app that I'm aware of that can track user engagement within the checkout area. Other apps I've tried were 1. extremely expensive and 2. stopped tracking after customer added to cart. Its a little glitchy but hit refresh a couple times and it ends up displaying properly.