Monster Cart Upsell+Free Gift

I had a good run with this app initially, but after one issue it quickly snowballed. Last week I raised concerns about billing inconsistencies that did not match their own pricing table. The initial customer support was extremely disappointing - I received one-line replies to a detailed report and was simply sent a link to the same pricing table I was questioning. For a high-volume store paying around $90 per month, I expected more serious engagement. After pushing back I was escalated to the founder, Ty, who was excellent. He handled the situation professionally and refunded the months in question. To prevent future billing issues he suggested migrating me to their new V2 beta. Unfortunately that decision has been a DISASTER. The V2 beta is highly unstable and introduced multiple serious problems. Upsell data was migrated incorrectly, with deals that required $110 spend reset to a $40 default threshold, something very easy to miss unless you manually check every upsell. This meant customers could unlock significant discounts far below intended spend levels. The cart itself became buggy and unstable, crashing, failing to load images and freezing pages. I was unable to roll back to V1 once migrated, and even disabling upsells and turning the cart off did not fully remove it. A broken version of the cart continued overriding the default Shopify cart. My only option was to uninstall the app entirely to remove the malfunctioning cart from my store. This is particularly frustrating because the app had previously performed well and helped increase AOV, but migrating a live high-volume store to a beta version on a Friday, leaving no weekend support, resulted in significant revenue loss. I am disappointed to leave a one-star review as I respect Ty as a founder and have enjoyed using this app, but based on this experience I cannot recommend it.

I would rate this 10 stars if I could. This is by far the strongest cart upsell app on Shopify right now.

Since implementing it, I have doubled my AOV, and it includes every feature you could need in a serious upsell tool. For a while I was torn between OCU and Monster Cart, but with their latest updates, Monster Cart clearly wins across the board.

Customer support has also been excellent. Fast, reliable, and at one point I even had one of the founders, Ty, personally assisting me.

100/10. If you are looking for an upsell app that genuinely lifts AOV, this is the one to use.

Decent app, but picked up that they are duplicating their charges every month. They charge a monthly fee + usage & a monthly fee again. I reached out to their support 2 weeks ago and keep getting a general response that they've passed on the message to the team leader, but still no response. Can you please refund and fix your charges ASAP? Check your charges on your monthly bill!