Checkout King vs SMART Checkout Upsells & Rules
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 Checkout King, Nov 9, 2026 for SMART Checkout Upsells & Rules.
The short answer
- Only Checkout King lists a free plan.
- Checkout King lists 12 features SMART Checkout Upsells & Rules’s listing doesn’t mention, including Cart-based, Checkout alerts, Custom messages.
Head to head
- Germany
- France
- Australia
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Free
- · 1 active rule, unlimited drafts
- · Automatic discount rules
- · Delivery, payment & checkout rules
- · Our branding on blocked messages
- · Rule simulator and conflict checks
Starter
- · Automatic discount rules
- · Delivery, payment & checkout rules
- · Order confirmation messages
- · Rule simulator and conflict checks
- · Unlimited active rules
- · Your own blocked-checkout wording
Growth
- · Everything in Starter
- · Priority support
- · Rule impact reporting
- · Scheduled rules with start/end dates
- · Version history and rollback
Plus
- · Checkout page content blocks
- · Checkout page fields
- · Everything in Growth
- · Price-override bundles
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureCheckout King controls what customers see at checkout — delivery options, payment methods, discounts, and whether an order can be placed. Write rules once — hide express shipping over 5kg, block PO box addresses, rename a payment method, discount large orders — and they apply automatically. The simulator shows which rules fire on a test cart before it goes live, and warns when rules contradict each other.
SMART Checkout Rules helps merchants control the checkout experience using flexible conditions. Validate checkout or hide, block, sort, or rename payment methods and shipping options based on rules like country, customer tag, cart value, product, or discount. Grow AOV with one-click post-purchase upsells and downsells, plus checkout blocks like banners, and discount codes.
- Hide, rename, reorder delivery options, payment methods by cart, addr, customer
- Block checkout on rules you set PO boxes, postcodes, missing details
- Test rule against a sample cart before it goes live, and catch conflicting rules
- Automatic discounts on products, orders and shipping, with no discount codes
- Validate and block specific checkouts
- Customize and control payment methods
- Hide, sort, and rename shipping options
- Streamline the checkout experience for customers
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 |  Checkout King |  SMART Checkout Upsells & Rules |
|---|---|---|
| Detected stores | Not published | 31 |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Apparel & Accessories, Home & Garden, Health & Beauty |
| Top store countries | Not published | Germany, France, Australia |
Reviews
| Measure | Checkout King | SMART Checkout Upsells & Rules |
|---|---|---|
| App Store rating | Not published | 5.0 ★ |
| App Store reviews | Not published | 851 |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | 4% |
Pricing
| Measure | Checkout King | SMART Checkout Upsells & Rules |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $14.99/month | No monthly plan listed |
| Longest free trial | 7 days | Not listed |
| Plans listed | 4 | Not published |
Listing
| Measure | Checkout King | SMART Checkout Upsells & Rules |
|---|---|---|
| Shopify category rank | Not enough data | #2 |
| Shopify App Charts | Not on this week’s charts | #19 in Checkout - Other |
| Built for Shopify | No | Yes |
| Launched | Sep 23, 2026 | Sep 11, 2024 |
| Languages | 1 | 1 |
| Developer | Checkout King | SMART Upsells & Checkout |
FAQ
Checkout King and SMART Checkout Upsells & Rules: common questions
- Is Checkout King or SMART Checkout Upsells & Rules cheaper?
- Only Checkout King lists a free plan. 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?
- Checkout King lists 12 the others don’t mention, such as Cart-based, Checkout alerts, Custom messages, Geolocation. 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 Checkout King, Nov 9, 2026 for SMART Checkout Upsells & Rules; 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 Checkout King, Nov 9, 2026 for SMART Checkout Upsells & Rules. 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.