SellUp: Add‑ons & Cart Upsell

The reviews are overwhelmingly positive. Most merchants praise the app for being easy to set up, simple to use, and effective at creating upsells and add-ons that can increase average order value and generate additional sales. A very common highlight is the support team, especially Dan, who is repeatedly described as fast, helpful, knowledgeable, and willing to make theme-specific fixes or styling adjustments quickly. Users also appreciate the app’s clean interface, customization options, and the fact that it can be integrated without overwhelming shoppers with intrusive popups. The negative feedback is much smaller in volume but points to a few recurring concerns. Some merchants report billing and view-count transparency issues, saying they were charged for higher usage tiers than expected or found the tracking unclear. Others mention functional limitations such as slow loading on product pages, difficulty saving new upsells, lack of bulk editing/import options, missing discount functionality, or needing payment information before testing. A few reviews also note compatibility problems with third-party or 2.0 themes, though these are often followed by praise for quick support resolution.