SellUp: Add‑ons & Cart Upsell vs StockLift: Slow Stock Upsells
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 8, 2026 for SellUp, Oct 13, 2026 for StockLift.
The short answer
- Only StockLift lists a free plan. Paid plans start at $14.99/month for SellUp and $24.99/month for StockLift.
- SellUp lists 17 features StockLift’s listing doesn’t mention, including A/B testing, AI recommendations, Custom CSS.
Head to head
- 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
Free
- · 3 active recovery offers
- · Cart add-on widget
- · Inventory scan
- · Offer diagnostics
- · Recovered revenue tracking
- · Retail value at risk
Starter
- · Cart add-on widget
- · Offer diagnostics
- · Product and order sync
- · Recovered revenue tracking
- · Revenue dashboard
- · Scoped discount codes
Growth
- · Advanced diagnostics
- · Discount cleanup
- · Larger catalog support
- · More analytics
- · Priority support
- · Revenue tracking
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureLooking 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.
StockLift helps merchants recover revenue from slow-moving inventory before it becomes dead stock. Scan catalog and recent order history to find SKUs tying up cash, create targeted cart add-on offers with scoped discount codes, and track recovered revenue from paid orders using StockLift codes. Pause, resume, remove offers, and clean up discounts safely.
- 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
- Scan catalog and order history to find slow-moving SKUs and at-risk inventory
- Activate upsell pairings with one click and scoped STOCKLIFT discount codes
- Show cart upsells on your storefront with the StockLift theme app block
- Track impressions, add-to-carts, and recovered revenue from paid orders
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 |  SellUp |  StockLift |
|---|---|---|
| Detected stores | 691 | Not published |
| Net store change, 28 days | −14 | 0 |
| Stores added, 28 days | 14 | Not enough data |
| Big-brand share | 11% | Not enough data |
| Top store categories | Apparel & Accessories, Home & Garden, Health & Beauty | Not published |
| Top store countries | United States, United Kingdom, Australia | Not published |
Reviews
| Measure | SellUp | StockLift |
|---|---|---|
| App Store rating | 4.4 ★ | Not published |
| App Store reviews | 132 | Not published |
| New reviews, 28 days | 0 | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
FAQ
SellUp and StockLift: common questions
- Is SellUp or StockLift cheaper?
- Only StockLift lists a free plan. Paid plans start at $14.99/month for SellUp and $24.99/month for StockLift. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- What features does each app list that the other doesn’t?
- SellUp lists 17 the others don’t mention, such as A/B testing, AI recommendations, Custom CSS, Custom HTML. 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 8, 2026 for SellUp, Oct 13, 2026 for StockLift; 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 Nov 8, 2026 for SellUp, Oct 13, 2026 for StockLift. 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.