AddOnce vs Checkout Upsell — Addonn
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 14, 2026 for AddOnce, Nov 7, 2026 for Checkout Upsell.
The short answer
- Only Checkout Upsell lists a free plan.
- Checkout Upsell lists 8 features AddOnce’s listing doesn’t mention, including Checkout upsell, Free gifts, Gift wrap.
Head to head
- Ireland
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
AddOnce Unlimited
- · 14-Day Full Access Trial
- · Attach to unlimited products
- · Checkbox & dropdown displays
- · Future updates included
- · Native cart lines
- · Native products & variants
Starter
- · 25 add-on orders free / month
- · Create upto 2 add-ons
- · Fixed add-on pricing
- · Live chat support
Premium
- · Auto assign tags to add-on orders
- · Create upto 5 add-ons
- · Fixed add-on pricing
- · Up to 500 add-on orders / month
Growth
- · Auto fulfill add-on line items
- · Create upto 10 add-ons
- · Priority customer support
- · Unlimited add-on orders
- · Widget customizations
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureAddOnce lets merchants present optional products and services directly on the product page. Create a Companion Product once, then attach it to any product where it belongs. Because AddOnce uses native products, inventory, variants, and fulfillment continue to work as expected. Customers choose optional add-ons before adding to cart, and each item is added as its own native cart line.
Turn checkout into revenue with optional service add-ons. Offer express shipping, gift services, warranties, and premium extras with one-click toggle widgets. Native Shopify Plus checkout integration means no pop-ups or redirects. You keep 100% revenue—zero commissions ever. Built for global stores with multi-currency and translation support. Create up to 10 add-ons with fixed or percentage pricing.
- Add optional add-ons with native Shopify products
- Create once. Attach to unlimited products.
- Customers add each selection as independent Shopify cart lines
- Automatically supports single- and multi-variant companion products
- Upsell optional add-ons directly inside Shopify Checkout
- Set fixed or flexible add-on prices based on cart value
- Built-in automatic multi-currency support — no extra setup needed
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 |  AddOnce |  Checkout Upsell |
|---|---|---|
| Detected stores | Not published | 1 |
| 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 | Furniture |
| Top store countries | Not published | Ireland |
Reviews
| Measure | AddOnce | Checkout Upsell |
|---|---|---|
| App Store rating | Not published | Not published |
| App Store reviews | Not published | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | AddOnce | Checkout Upsell |
|---|---|---|
| Free plan | Not listed | Yes |
| Lowest paid monthly plan | No monthly plan listed | $39.95/month |
| Longest free trial | Not listed | 14 days |
| Plans listed | 1 | 3 |
Listing
| Measure | AddOnce | Checkout Upsell |
|---|---|---|
| Shopify category rank | #663(ahead) | #891 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | No | No |
| Launched | Jul 31, 2026 | Nov 5, 2025 |
| Languages | 1 | 1 |
| Developer | Bison 46 Labs | Appiers |
FAQ
AddOnce and Checkout Upsell: common questions
- Is AddOnce or Checkout Upsell cheaper?
- Only Checkout Upsell 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?
- AddOnce lists 4 the others don’t mention, such as Frequently bought together, Product page upsell, Product recommendations, Warranties. Checkout Upsell lists 8 the others don’t mention, such as Checkout upsell, Free gifts, Gift wrap, Multi-currency. 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 14, 2026 for AddOnce, Nov 7, 2026 for 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 Oct 14, 2026 for AddOnce, Nov 7, 2026 for 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.