Mercury ‑ Personalise & Upsell vs SellUp: Add‑ons & Cart Upsell
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 13, 2026 for Mercury, Nov 3, 2026 for SellUp.
The short answer
- On the Shopify App Store: Mercury 5.0 from 3 reviews and SellUp 4.4 from 229 reviews.
- Paid plans start at $200/month for Mercury and $14.99/month for SellUp.
- Mercury lists 42 features SellUp’s listing doesn’t mention, including AI insights, AI search, Announcement bar.
Head to head
Cross-sell, Upsell, funnels, Add On, Recommendations & Cart.
- United States
- United Kingdom
- Australia
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Collection only
- · 50 Merchandising Campaigns
- · Customized Filters per collection
- · Live Indexing
- · No Code Collection Grid
- · Plutocracy Integrations
Search & Merch
- · 3rd party Integrations
- · Adaptive Search Engine
- · Analytics Engine
- · Collection Grid Plan
- · No Limits Merchandising Engine
- · Personalisation Engine
Pro
- · API Access
- · Custom AI Models
- · Dedicated Account Manager
- · Free JUNO license
- · One way synonym engine
- · Search & Merch Plan
Free Tier
- · AI On Page Upsell
- · Action Upsell
- · Analytics
- · Basic Support
- · Cart Upsell
- · Post Purchase
Getting Started
- · AI On Page Upsell
- · Action Upsell
- · Analytics
- · Cart Upsell
- · Post Purchase
- · Premium Support
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureMercury is a no-code, drag-and-drop solution for delivering personalised product recommendations, upsells, and cross-sells. It enhances every step of the shopping journey, from product discovery to the cart. With AI-driven search and dynamic merchandising, Mercury ensures your store showcases the most relevant products at the right time, boosting conversions and AOV.
Looking to maximize revenue? With SellUp, you can create precision based cross-sells, upsells, product accessories, shop the look & add-ons for your store. From the product page through to the cart & thank you page, you can offer the best upsell & product add-on flow throughout the customer journey. SellUp will match your stores design so upsells look seamless.
- AI Personalisation: Tailor product recommendations based on shopper behaviour
- Upsell & Cross-Sell Zones: Increase AOV with upsells from product pages to cart
- Dynamic Merchandising: Automatically display relevant products based on data
- Inline Banners: Scheduled banners (image/video) on grids & category pages
- Create cross-sells, upsells and add-ons to increase revenue across your store
- Offer add ons and upsells throughout the customer journey
- Create One Check Upsells in 60 seconds. Sell more with SellUp
- Create a frequently bought together section to increase average order value
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  Mercury |  SellUp |
|---|---|---|
| Detected stores | Not published | 670 |
| Net store change, 28 days | 0 | −20 |
| Stores added, 28 days | Not enough data | 12 |
| Big-brand share | Not enough data | 11% |
| Top store categories | Not published | Apparel & Accessories, Home & Garden, Health & Beauty |
| Top store countries | Not published | United States, United Kingdom, Australia |
Reviews
| Measure | Mercury | SellUp |
|---|---|---|
| App Store rating | 5.0 ★(ahead) | 4.4 ★ |
| App Store reviews | 3 | 229(ahead) |
| New reviews, 28 days | Not enough data | 0 |
| Reviewers a year or more in | Not enough data | Not enough data |
FAQ
Mercury and SellUp: common questions
- Is Mercury or SellUp cheaper?
- Paid plans start at $200/month for Mercury and $14.99/month for SellUp. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Which has better reviews, Mercury or SellUp?
- On the Shopify App Store: Mercury 5.0 from 3 reviews and SellUp 4.4 from 229 reviews.
- What features does each app list that the other doesn’t?
- Mercury lists 42 the others don’t mention, such as AI insights, AI search, Announcement bar, Autocomplete. SellUp lists 3 the others don’t mention, such as Pop-ups, Thank you page upsell, Warranties. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Oct 13, 2026 for Mercury, Nov 3, 2026 for SellUp; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Oct 13, 2026 for Mercury, Nov 3, 2026 for SellUp. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.