RS: Cart Upsell & Cross Sell 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 Nov 11, 2026.
The short answer
- SellUp is detected on 7.5× as many Shopify stores as RS: 768 vs 103 as of Nov 11, 2026.
- On the Shopify App Store: RS 5.0 from 7 reviews and SellUp 4.4 from 133 reviews.
- SellUp lists 13 features RS’s listing doesn’t mention, including AI recommendations, Custom HTML, Custom rules.
Head to head
Cross-sell, Upsell, funnels, Add On, Recommendations & Cart.
- Hungary
- United Kingdom
- United States
- 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.
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 featureRapid Upsell recommends complementary products and related items as one-click cart upsells and cross-sells — in the cart popup, drawer, and cart page. AI picks complementary products that fit each cart, so shoppers add frequently bought together items that raise AOV. Adjust colors, heading, product count, or add custom CSS to match your store.
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.
- One-click cart upsell in cart popup, cart drawer & cart page to improve AOV
- AI cross-sell picks products that match what's already in the cart
- Fully customizable upsell design: colors, heading, product count & custom CSS
- Smart analytics: track revenue by upsell & cross sell location, CTR & conversion
- 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 |  RS |  SellUp |
|---|---|---|
| Detected stores | 103 | 768(ahead) |
| Net store change, 28 days | +5 | −11 |
| Stores added, 28 days | 5 | 20(ahead) |
| Big-brand share | Not enough data | 11% |
| Top store categories | Apparel & Accessories, Health & Beauty, Home & Garden | Apparel & Accessories, Home & Garden, Health & Beauty |
| Top store countries | Hungary, United Kingdom, United States | United States, United Kingdom, Australia |
Reviews
| Measure | RS | SellUp |
|---|---|---|
| App Store rating | 5.0 ★(ahead) | 4.4 ★ |
| App Store reviews | 7 | 133(ahead) |
| New reviews, 28 days | Not enough data | 0 |
| Reviewers a year or more in | Not enough data | Not enough data |
FAQ
RS and SellUp: common questions
- Which is more popular, RS or SellUp?
- SellUp is detected on 7.5× as many Shopify stores as RS: 768 vs 103 as of Nov 11, 2026.
- Which has better reviews, RS or SellUp?
- On the Shopify App Store: RS 5.0 from 7 reviews and SellUp 4.4 from 133 reviews.
- What features does each app list that the other doesn’t?
- RS lists 7 the others don’t mention, such as Cart drawer, Checkout upsell, Custom CSS, Frequently bought together. SellUp lists 13 the others don’t mention, such as AI recommendations, Custom HTML, Custom rules, Frequently bought together. 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 Nov 11, 2026; estimated figures are labeled.
Keep comparing
More matchups
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 Nov 11, 2026. 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.