seems to work pretty well so far. Have not tried any others but pretty simple. Support responses are good as well

Great app. Very Easy to use. I just followed the steps and I did my very first up-sell in 1 min. Thank you

Love to use this app. Have the features I want, and most importantly it's free! You can customize the headings and description of the upsell page

GREAT APP! Easy to use and very helpful to increase your sells in your website store!!!!!!!!!!!!!!!!!

Works great. Customer support was fast and super helpful. The pop looks better than some of the other free ones too.

This is exactly what we were looking for. What a great app. Perfect functionality for our complex sales flow!

This is my first time using this app and it was a piece of cake to use and definitely gives my store a more professional look.

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nice!! it helps alot to pull trigger buyer to drop another products! your app is really great. i like very much.