SellUp: Add‑ons & Cart Upsell vs Upsell & Cross Sell — BoostUp
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 9, 2026 for SellUp, Oct 13, 2026 for Upsell & Cross Sell.
The short answer
- Only Upsell & Cross Sell lists a free plan. Paid plans start at $14.99/month for SellUp and $9/month for Upsell & Cross Sell.
- SellUp lists 13 features Upsell & Cross Sell’s listing doesn’t mention, including A/B testing, AI recommendations, Click-through rates.
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
Starter Tier I
- · All upsell & cross-sell widgets
- · Analytics dashboard
- · Chat, email & Zoom support
- · Free setup call
- · Frequently bought together bundles
- · Post-purchase & thank-you upsells
Starter Tier II
- · All upsell & cross-sell widgets
- · Analytics dashboard
- · Chat, email & Zoom support
- · Free setup call
- · Frequently bought together bundles
- · Post-purchase & thank-you upsells
Starter Tier III
- · All upsell & cross-sell widgets
- · Analytics dashboard
- · Chat, email & Zoom support
- · Free setup call
- · Frequently bought together bundles
- · Post-purchase & thank-you upsells
Starter Tier IV
- · All upsell & cross-sell widgets
- · Analytics dashboard
- · Chat, email & Zoom support
- · Free setup call
- · Frequently bought together bundles
- · Post-purchase & thank-you upsells
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.
BoostUp offers high-converting one-click upsells and post-purchase offers to maximize your revenue. Easily create Frequently Bought Together bundles and related product add-ons to instantly increase AOV. Our In-Cart upsell features smart, automatic recommendations to drive impulse buys.
- 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
- Cross-sell product add-ons on product page embedded as List, Grid.
- Show Amazon & List style "Frequently Bought Together" bundle widgets.
- Display dynamic Cart Upsell Funnels and Cart Drawer Add-ons.
- Offer one-click Post-purchase upsells and Thank You page deals.
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 | Upsell & Cross Sell |
|---|---|---|
| Detected stores | 697 | Not published |
| Net store change, 28 days | −13 | 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 | Upsell & Cross Sell |
|---|---|---|
| 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 |
Pricing
| Measure | SellUp | Upsell & Cross Sell |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | $14.99/month | $9/month(ahead) |
| Longest free trial | Not listed | 30 days |
| Plans listed | 2 | 4 |
Listing
| Measure | SellUp | Upsell & Cross Sell |
|---|---|---|
| Shopify category rank | #248(ahead) | #993 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Apr 26, 2019 | Jan 8, 2026 |
| Languages | 1 | 1 |
| Developer | LAUNCHTIP | Webiska |
FAQ
SellUp and Upsell & Cross Sell: common questions
- Is SellUp or Upsell & Cross Sell cheaper?
- Only Upsell & Cross Sell lists a free plan. Paid plans start at $14.99/month for SellUp and $9/month for Upsell & Cross Sell. 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 13 the others don’t mention, such as A/B testing, AI recommendations, Click-through rates, Custom CSS. 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 9, 2026 for SellUp, Oct 13, 2026 for Upsell & Cross Sell; 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 9, 2026 for SellUp, Oct 13, 2026 for Upsell & Cross Sell. 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.