Best Shopify Upsell & Cross-Sell Apps in 2026 [143,239-Store Study]

TL;DR:

• 98% of Shopify stores have no upsell or cross-sell app installed. Out of 143,239 stores in our database, only 2,800 run any upsell tool.
• Rebuy dominates the upsell market with ~2,651 installations, accounting for 95% of all detected upsell app installs. No other app comes close.
• Stores running upsell apps have 44% higher lead scores (94.7 vs 65.9) and install 3x more total apps (5.0 vs 1.6). They're the most sophisticated stores in our dataset.
• 98.7% of upsell app users are on Shopify Plus. On Standard Shopify, upsell adoption is effectively zero (0.1%).
• Health & Wellness leads upsell adoption at 4.4%, followed by Beauty at 3.9%. Fashion, the largest niche, trails at 1.8%.
• The Rebuy power stack: 87.7% of Rebuy stores also run Klaviyo, 25.3% use Gorgias, and 18.7% have Yotpo Reviews.

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Every "best Shopify upsell apps" article you'll find is the same thing. Someone lists ReConvert, AfterSell, and Bold. They compare feature tables. They rank their own product first. Nobody tells you what stores actually install.

We scanned 143,239 Shopify stores and recorded which upsell and cross-sell apps they run. The results will challenge what you've read elsewhere. The upsell app market is far more concentrated than the listicles suggest, and the adoption gap is staggering.

If you're an agency pitching AOV optimization, a consultant recommending tech stacks, or a SaaS company selling upsell tools, this data will reshape how you think about the market.

How We Collected This Data

We detect installed apps by scanning each store's public-facing code: JavaScript globals, script URLs, DOM elements, and network requests. Our scanner identifies 80+ apps across categories including upsell/cross-sell, email marketing, reviews, loyalty, support, and analytics.

What we can detect: Upsell apps that load client-side scripts, product recommendation widgets, or post-purchase offer elements on the storefront. This captures the major enterprise players, particularly Rebuy and Zipify OCU, which embed JavaScript widgets on product and cart pages.

What we cannot detect: Apps that operate entirely through Shopify's backend checkout extensions without frontend JavaScript (some post-purchase-only tools fall into this category). Apps like ReConvert, AfterSell, Selleasy, and Honeycomb may use server-side rendering or Shopify's checkout extensibility API, making them invisible to frontend scanning. We cover these apps later in this guide based on App Store data and public reviews, but our adoption rankings reflect only frontally detectable installations.

Why this still matters: Our detection captures the apps that leave the biggest footprint on store performance and user experience. Frontend upsell widgets (product recommendations, cart cross-sells, pop-ups) are what visitors actually see. The 98% non-adoption figure is conservative: actual upsell usage may be slightly higher, but the gap is still enormous.

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The Upsell Gap: 98% of Stores Have Nothing

Here's the finding that reframes the entire upsell app market:

Ninety-eight percent of Shopify stores have no detectable upsell or cross-sell app. Compare that to other CRO categories:

Upsell apps are the single most under-adopted category in the Shopify ecosystem. More stores run loyalty programs than upsell tools. More stores have wishlist apps than post-purchase offers.

This isn't because upselling doesn't work. Amazon attributes 35% of its revenue to cross-selling and product recommendations. Forrester research estimates upselling and cross-selling drive 10-30% of ecommerce revenue. The opportunity is real. Stores just aren't acting on it.

For agencies pitching CRO services, this is the biggest untapped lever. Telling a prospect "98% of stores like yours have no upsell strategy" is more compelling than any feature comparison.

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Most Popular Upsell Apps by Real Installation Data

Here's what 143,239 stores actually run, ranked by detected installations. We've consolidated duplicate detection entries (some apps appear under multiple script signatures) for accurate counts.

Rebuy owns the detected upsell market. With 2,651 stores, it accounts for 95% of all detected upsell app installations. This is a level of dominance that doesn't exist in other app categories. For comparison, Judge.me holds 47% of the review app market and Klaviyo holds 54% of the email marketing market. Rebuy's 95% is unprecedented.

Zipify OCU, the second most-detected app, has just 97 stores. That's a 27:1 ratio between first and second place.

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Upsell Adoption by Store Size

Upsell adoption generally increases with store size, though the pattern isn't perfectly linear. Even the largest stores rarely exceed 8%.

Three patterns emerge:

1. Even the biggest stores underinvest. At the 1M-5M tier, only 8.2% run an upsell app. More than 900 high-traffic stores are missing AOV optimization tools entirely.

2. The mid-market sweet spot. Stores in the 50K-200K range show the steepest jump in adoption (4.0%), suggesting this is where merchants first start investing in AOV optimization. These stores have enough traffic to see meaningful revenue impact.

3. The prospecting goldmine. Over 62,000 stores under 50K monthly visitors have no upsell tool. If you're an agency targeting emerging brands, this tier represents the largest addressable market.

For comparison, review app adoption reaches 34% at the 1M-5M tier and email marketing hits 70%+ among larger stores. Upselling is years behind both categories in adoption.

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Which Niches Invest Most in Upselling

Upsell adoption varies by industry, with consumable and repeat-purchase categories leading.

What the niche data reveals:

1. Health & Wellness and Beauty lead. These are repeat-purchase, consumable categories where "add another" or "subscribe and save" offers convert well. If a customer buys a moisturizer, a complementary serum is an obvious cross-sell. A 4.4% adoption rate is still low, but it's 2.4x the Fashion rate.

2. Rebuy wins every single niche. Just like Judge.me wins every niche in reviews, Rebuy dominates across all categories. There's no niche where a competing upsell app takes the lead.

3. Fashion is the biggest untapped market. With 35,154 stores and just 1.8% upsell adoption, there are over 34,500 fashion stores without upsell tools. Fashion has natural cross-sell opportunities: matching accessories, complete-the-look bundles, size upgrades. Agencies specializing in fashion ecommerce should lead with this data.

4. Jewelry and Travel trail the most. These are typically one-time, high-AOV purchases where impulse cross-sells are harder. Still, 98%+ without any upsell tool means there's room for growth.

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The Rebuy Tech Stack: What Power Users Run Together

With 2,651 stores in our database, Rebuy gives us the clearest picture of what the most sophisticated upsell adopters look like. Here are the apps they pair with Rebuy.

Most Common Apps Alongside Rebuy

What the Rebuy stack tells us:

• Klaviyo is nearly universal. 87.7% of Rebuy stores also run Klaviyo. This pairing makes sense: Klaviyo handles email and SMS automation, while Rebuy handles on-site product recommendations and cart optimization. Together they cover the full customer journey from email to checkout.

• Gorgias is the support tool of choice. One in four Rebuy stores uses Gorgias Chat, making it the third-most-common app in the stack. Stores that invest in upselling also invest in customer experience. Gorgias + Rebuy + Klaviyo is the "full CRO stack" we identified in our CRO checklist study, used by just 0.9% of all stores.

• Review apps are split. Yotpo (18.7%), Judge.me (14.8%), and Stamped.io (9.4%) each have significant share among Rebuy users. This is one of the few categories where Rebuy stores don't consolidate around a single tool. The choice of review app depends on budget and feature needs.

• Loyalty is common. 11% use Smile.io and 9.8% use Yotpo Loyalty. Rebuy stores invest in the full retention flywheel: upsell at checkout, email for re-engagement, loyalty for repeat purchases.

The Rebuy Power Stack

The most common full stack among Rebuy stores:

From our tech stack study, we know the average Shopify store runs 1.6 apps. Rebuy stores run 5.0 apps on average: 3x the norm. These aren't casual merchants. They're brands with dedicated ecommerce teams running optimized, multi-tool stacks.

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What Upsell App Users Look Like

The profile of a store running upsell tools is dramatically different from the average Shopify store.

The upsell user profile is clear: Shopify Plus stores with large tech stacks, sophisticated tracking, and high lead scores. They invest in everything.

The product count dip is interesting: upsell stores average 1,453 products vs 1,740 for non-upsell stores. This makes sense. Curated brands with focused catalogs (think DTC health supplements or premium skincare) benefit most from "frequently bought together" and "complete the routine" cross-sells. Stores with thousands of SKUs have different optimization strategies.

The 94.7 average lead score is the highest of any app category we've measured. For context, review app users average 86.2 and email marketing users average around 80. Upsell adoption is the strongest signal of a sophisticated, growth-focused store in our entire dataset.

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Shopify Plus vs Standard: The Upsell Divide

The gap between Shopify Plus and Standard stores is the widest we've seen in any app category.

Shopify Plus stores adopt upsell apps at 29x the rate of Standard stores. On Standard Shopify, upsell adoption is essentially nonexistent: 36 stores out of 46,268.

This is partly a pricing reality. Rebuy starts at $99/month, Zipify OCU charges based on upsell revenue, and most enterprise upsell tools price beyond what a $29/month Shopify Basic store would invest in. It's also a capability gap: Shopify Plus offers checkout extensibility that enables post-purchase offers and checkout upsells unavailable on Standard plans.

Among Plus stores, the adoption breakdown:

Even on Shopify Plus, 97% of stores have no upsell app. The market is wide open.

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Best Shopify Upsell Apps: Full Market Review

Our frontend scanner detects apps that load client-side JavaScript widgets. Many popular upsell apps operate through Shopify's checkout extensions or thank-you page customizations that aren't visible to frontend scanning. Here's every major upsell app reviewed, combining our detection data (where available) with App Store data and public reviews.

Rebuy: The AI Personalization Engine

Our data: 2,651 stores (1.85% of all stores, 95% of detected upsell installs)

Rebuy is the dominant enterprise upsell platform. It uses machine learning to power personalized product recommendations across the entire shopping journey: homepage, product pages, cart drawer, checkout, and post-purchase.

Why stores choose Rebuy: Full-journey personalization. Unlike post-purchase-only tools, Rebuy adds AI-powered recommendations to every touchpoint. Its Smart Cart feature replaces the default Shopify cart drawer with a personalized cross-sell experience. Allbirds, Bulletproof, and many other DTC brands in our database run Rebuy.

Best for: Shopify Plus stores doing $1M+ in annual revenue that want AI-driven recommendations across the full customer journey. Not a fit for stores on Standard Shopify or those looking for a budget option.

Zipify OCU: The Post-Purchase Specialist

Our data: 97 stores (0.07% of all stores)

Zipify One Click Upsell is built by Ezra Firestone's team (the company behind Zipify Pages and Smart Marketer). It focuses specifically on post-purchase upsells: offers shown between checkout and the thank-you page.

Why stores choose Zipify: Clean pricing model. Unlike competitors that charge based on total order volume, Zipify only charges when an upsell converts. It's the only major upsell app that integrates with the Shop app (100M+ users), giving post-purchase offers exposure beyond the store checkout. All seven upsell placements (pre-purchase, in-checkout, post-purchase, etc.) are included in every plan.

Best for: Stores focused specifically on post-purchase offers that want transparent, performance-based pricing. Strong option for stores doing $500K-$5M that want to test upselling before committing to Rebuy's pricing.

ReConvert: The Thank-You Page Optimizer

Our data: Not detected (likely uses server-side rendering and Shopify's checkout extensions)

ReConvert is one of the most popular upsell apps by App Store reviews. It specializes in optimizing the thank-you page and post-purchase experience with product recommendations, countdown timers, surveys, and reorder buttons.

Why stores choose ReConvert: Accessible entry point. The free plan and low starting price ($4.99/mo) make it the most affordable upsell option for smaller stores. Thank-you page optimization is an often-ignored touchpoint, and ReConvert lets merchants add product recommendations, birthday collectors, and reorder buttons without developer help.

Best for: Small to mid-market stores starting with upselling. The thank-you page focus means it's additive to other upsell tools. Some stores run ReConvert on the thank-you page alongside Rebuy on product pages.

AfterSell: One-Click Post-Purchase Offers

Our data: Not detected (uses Shopify's checkout extensibility API)

AfterSell specializes in one-click post-purchase upsells where customers can add items after completing checkout without re-entering payment details.

Why stores choose AfterSell: Frictionless one-click acceptance. Customers see the offer after payment, so there's zero risk of cart abandonment from the upsell. AfterSell reports conversion rates of 5-15% on post-purchase offers. The downside: pricing is based on total monthly orders, not upsell revenue, so you pay whether upsells convert or not.

Best for: Stores doing 100-2,000 orders per month that want to add post-purchase offers without the commitment of Rebuy's enterprise pricing. Checkout-level upsells (in-cart and checkout page) require Shopify Plus.

Selleasy: The Budget-Friendly Option

Our data: Not detected

Selleasy (by Logbase) is the rising budget contender in the upsell market. It offers "frequently bought together" bundles, cart upsell add-ons, and post-purchase offers at a fraction of the price of Rebuy or AfterSell.

Why stores choose Selleasy: Price and simplicity. No revenue-sharing fees, no order volume pricing. A flat $8.99/mo covers everything. For stores under 50 monthly orders, it's completely free. The feature set covers the basics: "frequently bought together" widgets, cart add-ons, and post-purchase offers.

Best for: New and small stores testing upselling for the first time. If you're under 50 orders per month, start here. The free tier has no feature restrictions.

Honeycomb: Funnel-Based Upsells

Our data: Not detected

Honeycomb positions itself as a funnel builder for post-purchase upsells, letting merchants create multi-step upsell sequences (offer A, if declined, offer B).

Why stores choose Honeycomb: Multi-step funnels. Instead of a single post-purchase offer, Honeycomb lets you create sequences: "Add this accessory? No? How about a discount on your next order?" A/B testing is built into every plan.

Best for: Mid-market stores that want to experiment with upsell funnels beyond single-offer tools. The funnel approach works well for stores with complementary product lines.

Candy Rack: Pre-Purchase Pop-Ups

Our data: Not detected

Candy Rack triggers pop-up upsell offers when customers click "Add to Cart." It focuses on the pre-purchase moment, before the customer reaches checkout.

Why stores choose Candy Rack: Pre-purchase timing. Most upsell apps focus on post-purchase. Candy Rack catches customers at the add-to-cart moment, when buying intent is highest. The pop-up format is familiar (think Amazon's "Frequently Bought Together" but triggered on add-to-cart).

Best for: Stores that want to increase AOV before customers reach checkout, rather than after. Works well alongside post-purchase tools like ReConvert or AfterSell.

Bold Upsell: The Legacy Player

Our data: Not detected

Bold Commerce is one of the oldest Shopify app developers, and Bold Upsell was among the first dedicated upsell apps in the ecosystem. It offers pop-up upsells and cross-sells triggered by cart behavior.

Why stores choose Bold: Brand recognition and reliability. Bold has been in the Shopify ecosystem since 2012. The app handles basic upsell and cross-sell pop-ups with targeting rules based on cart contents, customer tags, and more. However, newer competitors (Selleasy, Honeycomb) have surpassed Bold's feature set at similar or lower price points.

Best for: Stores already using other Bold apps (Bold Subscriptions, Bold Product Options) that want to stay in one ecosystem. For new implementations, newer alternatives offer more features per dollar.

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How to Choose the Right Upsell App

Based on our data and the current market, here's a practical decision framework:

Choose Rebuy if:

• You're on Shopify Plus doing $1M+ annually
• You want AI-powered recommendations across the full shopping journey (not just post-purchase)
• You have budget for $99-$749/mo and expect measurable ROI
• You already run Klaviyo and Gorgias (the most common Rebuy stack)
• You want the app that 2,651 of the most sophisticated stores in our database chose

Choose Zipify OCU if:

• You want post-purchase upsells with performance-based pricing (pay only when upsells convert)
• You sell on the Shop app and want upsell exposure there
• You want transparent pricing without per-order fees
• Budget: $35-$99/mo + revenue share on successful upsells

Choose ReConvert if:

• You're starting with upselling and want a low-risk option
• Thank-you page optimization is your primary goal
• You want a free plan to test before committing
• Budget: Free to $14.99/mo + 0.75% upsell revenue share

Choose AfterSell if:

• One-click post-purchase offers are your priority
• You want high-converting offers shown after payment (zero abandonment risk)
• You're doing 100-2,000 orders per month
• Budget: $34.99-$99.99/mo based on order volume

Choose Selleasy if:

• You're a small store under 50 orders/month (free tier)
• You want basic "frequently bought together" and cart upsells
• Flat pricing matters to you (no revenue share)
• Budget: Free or $8.99/mo flat

Start with any upsell app if:

• You currently have none. The gap between "no upsells" and "any upsells" is far larger than the gap between Rebuy and Selleasy. A Forrester study estimates upselling adds 10-30% to ecommerce revenue. Even a basic cross-sell widget is better than leaving 98% of the potential untapped.

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Prospecting Angles: Finding Stores That Need Upsell Help

If you sell CRO services, Shopify development, or app implementation, this data maps your addressable market.

The Biggest Opportunities

Stores with 50K-1M traffic and no upsell app: Over 75,000 stores in our database. These stores have real traffic and real revenue. They're generating enough orders for upselling to make a meaningful difference, yet they have no AOV optimization tools. This is the single largest opportunity in Shopify CRO.

Health & Wellness stores without upselling: 6,730 stores. This niche has the highest natural upsell potential (consumable, repeat-purchase products), but 95.6% have no upsell app. If you specialize in health and wellness ecommerce, lead with this stat.

Stores running Klaviyo but no upsell app: Klaviyo is installed on ~30% of Shopify stores. Among Rebuy users, 87.7% also run Klaviyo. If a store has invested in email marketing but skipped upselling, they've built the retention engine without the AOV engine. These are warm prospects who already invest in growth tools.

By Niche

Fashion alone has 34,500 stores with no upsell tools. "Complete the look" and "customers also bought" recommendations are standard in fashion retail but absent from 98% of Shopify fashion stores.

The Pitch Framework

When reaching out to stores without upsell apps, lead with the gap:

"I analyzed your store and noticed you're not running any cross-sell or recommendation tools. 98% of Shopify stores are in the same position, but the ones that do add upselling see 10-30% revenue increases. Given your [niche] catalog, a simple 'frequently bought together' widget could add $X/month to your AOV."

You can find stores matching these criteria in the StoreInspect dashboard by filtering on app presence, traffic tier, and category.

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Frequently Asked Questions

What is the most popular upsell app for Shopify?

Based on our scan of 143,239 Shopify stores, Rebuy is the most-installed detectable upsell app with approximately 2,651 stores (1.85% of all stores). It accounts for 95% of all detected upsell app installations. By Shopify App Store reviews, ReConvert leads with 5,700+ reviews, followed by Selleasy (1,800+), AfterSell (800+), and Rebuy (700+).

How many Shopify stores use an upsell app?

Only 2% of Shopify stores (2,800 out of 143,239 in our dataset) have a detectable upsell or cross-sell app. The other 98% (140,437 stores) have no upsell tool on their storefront. This makes upselling the most under-adopted app category in the Shopify ecosystem, behind email marketing (38% adoption) and reviews (21% adoption).

Is Rebuy worth the price?

For Shopify Plus stores with meaningful traffic, the data suggests yes. Rebuy stores in our database have 44% higher lead scores (94.7 vs 65.9) and run 3x more apps on average. However, at $99-$749/mo, Rebuy is not a fit for small stores. Alternatives like Selleasy ($8.99/mo flat) and ReConvert (free tier available) offer entry-level upselling at a fraction of the cost.

Do I need Shopify Plus for upsell apps?

Not for basic upselling. Apps like Selleasy, ReConvert, and Bold Upsell work on all Shopify plans. However, checkout page upsells (offers shown during the checkout flow) require Shopify Plus due to checkout extensibility restrictions. Post-purchase upsells (shown after payment) work on all plans. In our data, 98.7% of stores with upsell apps are on Shopify Plus, but that partly reflects Rebuy's enterprise positioning rather than a technical requirement.

What is the best free upsell app for Shopify?

Selleasy offers the most capable free tier: full functionality (frequently bought together, cart add-ons, post-purchase offers) for stores under 50 orders per month with no feature restrictions. ReConvert also has a free plan, though with more limitations. For stores testing upselling before committing budget, Selleasy's free tier is the strongest starting point.

What is the difference between upselling and cross-selling on Shopify?

Upselling encourages customers to buy a higher-priced version of the product they're viewing (e.g., a larger size or premium tier). Cross-selling recommends complementary products (e.g., "add matching socks with these shoes"). In practice, most Shopify "upsell" apps handle both. Rebuy powers AI-driven recommendations for both, while apps like Candy Rack and Selleasy offer "frequently bought together" cross-sells.

When should upsells appear: before or after purchase?

Both work, but they serve different goals. Pre-purchase upsells (product page, cart drawer) increase AOV before checkout but risk cart abandonment if too aggressive. Post-purchase upsells (after payment confirmation) have zero abandonment risk since the primary purchase is complete. Many stores run both: Rebuy or Candy Rack for pre-purchase, and ReConvert or AfterSell for post-purchase. Our data shows Rebuy (primarily pre-purchase and in-cart) is by far the most adopted approach.

What is a good upsell conversion rate on Shopify?

Industry benchmarks vary, but AfterSell reports 5-15% conversion rates on post-purchase offers. Pre-purchase upsells (product recommendations, cart add-ons) typically convert at 1-5%. The key metric is incremental AOV lift, not just conversion rate. A 5% conversion on a $25 upsell adds $1.25 to average order value across all orders, which compounds significantly at scale.

Can I use multiple upsell apps at the same time?

Yes, but few stores do. In our data, only 0.4% of upsell app users run two or more upsell tools. The most common pairing is Rebuy + Zipify OCU (8 stores). A practical multi-app approach: use Rebuy for on-site product recommendations and a post-purchase tool like ReConvert for thank-you page offers. Avoid stacking apps that target the same touchpoint, which can create a cluttered experience and slow page load times.

Which Shopify niches benefit most from upsell apps?

Health & Wellness leads adoption at 4.4%, followed by Beauty (3.9%) and Baby & Kids (2.9%). These consumable, repeat-purchase categories have natural "add another" and "complete the routine" opportunities. Food & Beverage (2.8%) and Pets (2.6%) also over-index. Fashion (1.8%) has surprisingly low adoption despite being the largest Shopify niche, which represents a significant untapped market.

How do upsell apps affect Shopify store speed?

Upsell apps that load product recommendation widgets add JavaScript to your storefront, which impacts page load time. The effect varies: Rebuy's AI widgets are heavier than Selleasy's basic cross-sell blocks. Always test Core Web Vitals before and after installing an upsell app. The revenue lift from upselling typically outweighs a minor speed impact, but poorly implemented widgets can hurt conversion rates. Monitor your store performance after installation.

How can I find Shopify stores that need upsell help?

Use a Shopify store database with app filtering. In the StoreInspect dashboard, filter for stores with no upsell app plus meaningful traffic (50K+ monthly visitors). There are over 75,000 stores matching this criteria in our database. You can further narrow by niche, Shopify Plus status, or existing tech stack to find the best-fit prospects. Stores already running Klaviyo but missing upsell tools are particularly strong leads.

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Key Findings Summary