Increasing your average order value (AOV) is one of the simplest and most effective ways to grow revenue—without spending more on advertising. That’s why checkout upselling has become a must-have tactic for Shopify stores in 2026. Thanks to Shopify’s Checkout Extensibility upgrades, merchants can now add upsells directly inside the checkout flow, boosting conversions and revenue with minimal friction.

The best part?
There are several free checkout upsell apps that deliver powerful results without requiring a paid subscription.

In this comprehensive guide, you’ll discover:

• The best 100% free or free-plan available Shopify checkout upsell apps

• What each app does

• Quick demo of how upsells look inside the checkout

• Pros & cons

• Which stores each app is ideal for

• Tips to choose the right checkout upsell tool

Let’s jump into the top 8 free apps you can install today.

1. Kaktus Checkout Upsell & Cross-Sell

⭐ Best All-in-One Checkout Upsell App (Free Plan Available)

Kaktus is one of the leading upsell apps in 2026, known for its modern UI, fast performance, and depth of customization. The app allows you to create upsells in:

• Checkout

• Cart

• Post-purchase

• Thank-you page

The free plan covers checkout upsells, making it perfect for small stores looking to boost AOV without extra cost.

Key Features

• Checkout upsells (Shopify Plus & Basic Shopify with extensibility)

• Add-on products

• One-click upsell acceptance

• “Frequently Bought Together” suggestions

• Order summary upsell blocks

• Gift with purchase (GWP)

• A/B testing (premium)

• AI recommendation engine (premium)

Quick Demo (How It Looks in Checkout)

Scenario: Customer buys a $45 cleanser.
Checkout displays:

“Complete your skincare routine: Add Vitamin C Serum for 20% Off.”

With a simple Add to Order button inside the checkout section.

Pros

• Modern UI

• Very easy to set up

• Works in checkout, cart drawer, and post-purchase

• Free plan includes checkout upsell

• Great for beginners and advanced stores

Cons

• A/B testing requires a paid plan

• Advanced styling locked behind premium

Best For

Beauty, apparel, home goods, supplements, D2C stores.

2. ReConvert Upsell & Thank You Page

⭐ Best Free Thank-You Upsell with Checkout Extensions

ReConvert is widely known for post-purchase funnels, but since the Shopify Checkout Extensibility update, they now support simple checkout upsells too. The free plan includes limited features, but still enough for small stores.

Key Features

• Checkout upsell block

• Thank-you page upsells

• Reorder widgets

• Timers & urgency tools

• Cross-sell recommendations

Quick Demo

During checkout, shoppers might see:

“Add a replacement filter for only $9.99.”

A small block within the checkout sidebar.

Pros

• Reliable and widely adopted

• Easy to use

• Free plan available

Cons

• Checkout upsells less customizable than Kaktus

• Free plan limits monthly orders

Best For

Beginner stores looking for simple, clean upsells.

3. Monster Checkout Upsell

⭐ Best for Fast One-Click Upsells

Monster provides a minimalist style and very fast performance. It focuses purely on checkout and post-purchase upsells.

Key Features

• Checkout upsell

• Cart upsell

• One-click acceptance

• Lightweight, no slowdown

• Free plan available

Quick Demo

In the payment section:

“Customers often add: Heat-Proof Bottle Sleeve – $4.99”

Pros

• Clean, simple, fast

• Very easy to install

• Free plan available

Cons

• Few advanced logic options

• Basic styling

Best For

Low-ticket product stores.

4. Checkout Bear: Free Checkout Add-Ons

⭐ Best 100% Free Upsell App (No Paid Plan)

Checkout Bear is a new app focused entirely on offering free checkout upsell add-ons using Shopify’s updated checkout API.

Key Features

• 100% free

• Checkout upsells

• Order bumps

• Add-on products

• Custom text blocks

• Trust badges

Quick Demo

In the “Review your order” section:

“Add gift wrapping for only $3.”

Pros

• Totally free

• Simple setup

• Works beautifully with Checkout Extensibility

Cons

• Limited advanced features

• No analytics

• No AI recommendations

Best For

Shops wanting a fully free system without complexity.

5. Upsell Wizard Checkout Offers

⭐ Best for Real-Time Personalization

Upsell Wizard focuses on smart personalization and custom logic triggers.

Key Features

• Rules based on cart value

• Upsells inside checkout

• Free plan available

• Product recommendations

• Volume-based upsells

Quick Demo

If a buyer has over $50 in the cart:

“Add this $12 travel pouch to unlock FREE shipping.”

Pros

• Powerful rules

• Tailored upsells

• Great for medium-sized stores

Cons

• Free plan has limits

• Setup takes longer

Best For

Merchants needing detailed upsell logic.

6. Honeycomb Checkout Upsells

⭐ Best for Shopify Plus Stores

Honeycomb has been in the upsell space for years and now supports Shopify checkout blocks.

Key Features

• Checkout order bumps

• Thank-you page upsells

• Cart page upsells

• Free plan with limited monthly upsells

Quick Demo

During checkout:

“Add Shoe Protector Spray – 15% OFF Today Only!”

Pros

• Beautiful templates

• Easy to customize

• Multi-step funnels

Cons

• Free plan limited

• Some features Shopify Plus only

Best For

Scaling stores & fashion brands.

7. Easy Bundles Checkout Upsell

⭐ Best App for Bundles in Checkout

If you want customers to build bundles directly inside checkout, this app is ideal.

Key Features

• Custom bundles

• Add-to-bundle checkout display

• Free plan available

• Gift sets

• Mix & match

Quick Demo

In the checkout sidebar:

“Create a bundle: Choose 1 more item and save 20%.”

Pros

• Unique bundle feature

• Boosts AOV dramatically

• Attractive UI

Cons

• Not ideal for simple upsells

• Free plan limited

Best For

Beauty, self-care, snack brands.

8. Zoorix Checkout Upsell

⭐ Best for AI-Driven Upsells (Free Tier Included)

Zoorix is known for AI-powered “Frequently Bought Together” and now supports checkout upsells too.

Key Features

• AI recommendations

• Checkout upsell block

• Cart drawer upsell

• One-click purchase

• Free plan available

Quick Demo

Under the cart summary:

“Frequently bought with your item: Pet Grooming Brush – $6.99.”

Pros

• Strong AI engine

• Easy to set up

• Free plan available

Cons

• Styling options limited

• AI accuracy depends on store data

Best For

Stores with many SKUs (pet, home decor, accessories).

Comparison Table: Best Free Shopify Checkout Upsell Apps (2026)

Checkout upsells are now one of the most powerful tools for increasing AOV on Shopify—especially thanks to Checkout Extensibility. Even better, you don’t need to pay for premium tools to get started. The eight free apps in this guide give you everything you need to:

• Offer smart product add-ons

• Show bundles or FBT suggestions

• Add order bumps directly in checkout

• Increase conversions without interrupting the shopping flow

Whether you’re a new Shopify merchant or a growing D2C brand, these free apps can help you generate more revenue from the traffic you already have.