App seems easy enough to use. BUT: There is no internal confirmation email, or any other type of notification, when someone purchases a post sale through the app. SO if you auto print your orders as they come in, the upsell will not be on the order. So now you need to manually check everyday to see if there are any post sells? This leaves way too much room for human error. It is 2021 and i can not believe they can not send a simple email, or some other notification to any other of the thousands of app integrations out there (ie:SLACK), when an order has a post sell added to it. Especially considering with the $50/mo fee and a 1% royalty, this should be standard. Another issue is if you want to offer a few small add-ons, they do not show all at one time. They are in series. The flow is annoying this way and seems like a never ending upsell attempt to the customer. They should have a template to add multiple items on the same upsell page.

Extremely slow load speed. It will cause your sales to drop, effectively losing you money. 1/5, I will not recommend this app to anyone except my worst enemies. Lol.

I have been with Carthook in the past, and they have always had a very severe attitude problem when their app has a bug and doesn't work properly. In my most recent case, there was an issue with the custom tracking code. I reached out to them, and after 30 back-and-forth emails PLUS a rude and incompetent customer service, the CEO decided to revoke the account. PLUS, they also overbilled me, BANNED my account and refused to refund me. I have spent over 1,000 dollars on wasted ad spend, and will now proceed to opening a dispute with them. The current carthook version is a total joke too. The whole purpose of an upsell app is to make you more money. HOWEVER, due to the extremely slow load speed, the app will murder your conversions- Amazon has done a study to show that for every 1s longer an app takes to load, it will kill your conversion by about 10%. Carthook takes about 6s to load- 3s more than shopify's native checkout pages and that means you earn 30% less. This app will cost you more money than it can make you. All in, don't bother wasting your time giving this app a try.

We are having issues with Carthook not able to add paypal transaction Info to the native Shopify fields or at least to add them correctly as one Tag. Carthook is adding them as a variation of 0_, 1_, 2_ that is hard to track using other application. We are using a reporting app and a Paypal Sync tracking app (TrackiPal) on 5 more stores, and having a huge challenge getting carthook to collaborate for this.