CartBoost: Checkout Upsell vs UpsellPlus Checkout Upsell
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 4, 2026 for CartBoost, Nov 5, 2026 for UpsellPlus Checkout Upsell.
The short answer
- Both list a free plan. Paid plans start at $9.99/month for CartBoost and $49/month for UpsellPlus Checkout Upsell.
- UpsellPlus Checkout Upsell lists 19 features CartBoost’s listing doesn’t mention, including A/B testing, AI recommendations, Announcement bar.
Head to head
Grow AOV, post-purchase, BOGO, offers, funnels, gifts
- United States
- United Kingdom
- Sweden
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Free
- · 1-Click checkout order bump
- · Checkout milestone progress bar
- · Native Checkout Extensibility
- · Standard email support
Pro
- · 1-Click post-purchase upsells
- · Multi-tier milestone rewards
- · Priority developer support
- · Unlimited checkout orders
Free
- · Analytics
- · Build for free. Launch with a free trial
- · Checkout Upsells (Plus only)
- · Choose from all 12 upsell types
- · Product, Cart, Post-purchase upsells
Launch
- · Cart Page, Pop-up & Drawer Upsells
- · Earn back fees with UpsellPlus Earn
- · Free Gifts
- · Multivariate A/B testing
- · Post-purchase Upsells
- · Product Page Upsells
Shopify Plus
- · AI recommendations
- · Checkout Customization
- · Checkout Upsells
- · Earn back fees with UpsellPlus Earn
- · Everything in Basic, plus:
- · Thank You Page Customizations
Scale
- · Checkout & TY page Customization
- · Checkout Upsells
- · Earn back fees with UpsellPlus Earn
- · Everything in Basic, plus:
- · Live support with 30s replies
- · Multivariate A/B Testing
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureCartBoost helps merchants increase Average Order Value directly within Shopify checkout. Set dynamic milestone reward progress bars for free shipping and gift tiers that update live with cart totals. Offer high-converting 1-click checkout order bumps and post-purchase upsells with zero checkout friction. Built 100% natively on Checkout Extensibility with no theme code injection or slow scripts.
UpsellPlus helps increase average order value with personalized upsells and cross sells across product pages, cart drawers, checkout, post purchase, thank you, order status and customer account pages. Staff can also upsell in store with offers on the Shopify POS home screen, added in one tap. Create one click post purchase offers, free gifts, subscription upgrades and checkout customizations.
- Checkout progress bar with tiered milestone rewards
- One-click order bumps placed directly inside native checkout
- Post-purchase 1-click upsells displayed right after payment
- Visual checkout customizer block with live admin simulator
- Customize checkout, cart and post-purchase page with upsells and customizations
- Upsell one-off purchases to subscriptions to grow your recurring revenue
- Add custom fields to checkout page for gift message, delivery date/notes
- A/B test checkout upsells to learn what works best
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 |  UpsellPlus Checkout Upsell | |
|---|---|---|
| Detected stores | Not published | 95 |
| Net store change, 28 days | 0 | +16 |
| Stores added, 28 days | Not enough data | 18 |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Apparel & Accessories, Health & Beauty, Food, Beverages & Tobacco |
| Top store countries | Not published | United States, United Kingdom, Sweden |
Reviews
| Measure | UpsellPlus Checkout Upsell | |
|---|---|---|
| App Store rating | Not published | 5.0 ★ |
| App Store reviews | Not published | 152 |
| New reviews, 28 days | Not enough data | 7 |
| Reviewers a year or more in | Not enough data | 11% |
Pricing
| Measure | UpsellPlus Checkout Upsell | |
|---|---|---|
| Free plan | Yes | Yes |
| Lowest paid monthly plan | $9.99/month(ahead) | $49/month |
| Longest free trial | 14 days | 14 days |
| Plans listed | 2 | 4 |
Listing
| Measure | UpsellPlus Checkout Upsell | |
|---|---|---|
| Shopify category rank | Not enough data | #22 |
| Shopify App Charts | Not on this week’s charts | #11 in Checkout - Other |
| Built for Shopify | No | Yes |
| Launched | Nov 4, 2026 | Nov 3, 2021 |
| Languages | 1 | 1 |
| Developer | ModApps | UpsellPlus |
FAQ
CartBoost and UpsellPlus Checkout Upsell: common questions
- Is CartBoost or UpsellPlus Checkout Upsell cheaper?
- Both list a free plan. Paid plans start at $9.99/month for CartBoost and $49/month for UpsellPlus Checkout Upsell. 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?
- CartBoost lists 1 the others don’t mention, such as Free shipping. UpsellPlus Checkout Upsell lists 19 the others don’t mention, such as A/B testing, AI recommendations, Announcement bar, Cart drawer. 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 4, 2026 for CartBoost, Nov 5, 2026 for UpsellPlus Checkout Upsell; 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 4, 2026 for CartBoost, Nov 5, 2026 for UpsellPlus Checkout Upsell. 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.