Checkout B | Checkout Upsells vs Comet: Campaign Funnel Builder
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 7, 2026 for Checkout B, Oct 13, 2026 for Comet.
The short answer
- On the Shopify App Store: Checkout B 5.0 from 6 reviews and Comet 5.0 from 3 reviews.
- Only Comet lists a free plan. Paid plans start at $199/month for Checkout B and $49/month for Comet.
- Comet lists 25 features Checkout B’s listing doesn’t mention, including A/B testing, AI generation, Analytics.
Head to head
- United States
- Germany
- United Kingdom
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Checkout Plus
- · Access to all features
- · Advanced Branding (Custom CSS + Fonts)
- · Analytics
- · Checkout Upsells
- · Customize Thank you & Order Status Pages
- · Customize Thank you & Order Status Pages
Install
- · Test features in preview mode
Starter
- · 10,000 monthly sessions
- · 14+ customizable sections
- · Boost CVR 2 with tailored product pages
- · Experiment with up to 5 funnel AB tests
- · Increase AOV with promotions & upsell
- · Increase CRV 1 with custom landing pages
Growth
- · 25 A/B tests
- · 3 Shopify Parent Stores
- · 5 team members
- · 50,000 monthly sessions
- · Launch Micro-stores with Claude & Codex
- · Unlimited micro-stores
Pro
- · 200,000 monthly sessions
- · Bulk Micro-store generation for creators
- · Connect multiple parent Shopify stores
- · Launch Micro-stores with Claude & Codex
- · Unlimited A/B test tests
- · Unlimited team members
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureCheckout Builder gives Shopify Plus merchants full control over Checkout with high-converting, extensible blocks. Add upsells, cross-sells, trust badges, custom messaging, dynamic content, and conditional logic—no code required. Built on Shopify Checkout Extensibility, it’s fast, secure, upgrade-safe, and fully compatible with Shopify updates.
Sending paid social traffic to your PDP or homepage limits conversion potential. Comet lets you build campaign-specific checkout-stores — dedicated landing pages, bespoke product pages & checkout flows that match your campaign. Products, inventory, and orders sync with Shopify automatically. Each store gets its own URL and tracking. Brands using Comet see major improvements in CAC and conversion rates.
- Increase revenue w/ ROI-focused elements: conditional upsells, upgrades, & more.
- Add your branding to checkout with our advanced branding editor & live preview.
- Increase conversion with free shipping upsells & dynamic content for trust.
- Incorporate custom fields for gift messages, delivery notes, etc.
- Build tailored social commerce funnels for social ads or influencers.
- Customize every step of the funnel with our no-code drag&drop builder.
- Track sales, conversion rates and ROI in real time with built-in analytics.
- Create co-branded influencer, affiliate and video shops with custom branding.
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 B |  Comet |
|---|---|---|
| Detected stores | 92 | Not published |
| 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 | Apparel & Accessories, Electronics, Home & Garden | Not published |
| Top store countries | United States, Germany, United Kingdom | Not published |
Reviews
| Measure | Checkout B | Comet |
|---|---|---|
| App Store rating | 5.0 ★ | 5.0 ★ |
| App Store reviews | 6(ahead) | 3 |
| New reviews, 28 days | 0 | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | Checkout B | Comet |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | $199/month | $49/month(ahead) |
| Longest free trial | 7 days | 7 days |
| Plans listed | 1 | 4 |
Listing
| Measure | Checkout B | Comet |
|---|---|---|
| Shopify category rank | #161 | #167 |
| Shopify App Charts | #8 in Checkout - Other | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Sep 6, 2023 | Feb 24, 2025 |
| Languages | 1 | 1 |
| Developer | Checkout Builder | Comet Rocks GmbH |
FAQ
Checkout B and Comet: common questions
- Is Checkout B or Comet cheaper?
- Only Comet lists a free plan. Paid plans start at $199/month for Checkout B and $49/month for Comet. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Which has better reviews, Checkout B or Comet?
- On the Shopify App Store: Checkout B 5.0 from 6 reviews and Comet 5.0 from 3 reviews.
- What features does each app list that the other doesn’t?
- Checkout B lists 13 the others don’t mention, such as Checkout upsell, Custom rules, Frequently bought together, Gift wrap. Comet lists 25 the others don’t mention, such as A/B testing, AI generation, Analytics, APIs and webhooks. 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 7, 2026 for Checkout B, Oct 13, 2026 for Comet; 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 7, 2026 for Checkout B, Oct 13, 2026 for Comet. 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.