C Builder | Checkout Upsells! vs Fly: Bundles & Quantity Breaksfor Shopify (2026)
C Builder | Checkout Upsells! and Fly: Bundles & Quantity Breaks both aim to increase Average Order Value (AOV) through upselling and cross-selling techniques, but they target different segments of the Shopify market and employ different strategies. C Builder focuses exclusively on Shopify Plus merchants, leveraging Checkout Extensibility to customize the checkout experience itself with upsells, cross-sells, and conditional logic. It emphasizes a secure, upgrade-safe integration. Fly Bundles, on the other hand, is designed for a broader range of Shopify merchants, offering a variety of bundling and discounting features accessible through widgets on product and cart pages, with a focus on ease of use and comprehensive 24/7 support. C Builder's strength lies in its deep integration with the Shopify Plus checkout flow, allowing for highly customized and dynamic checkout experiences. Its target audience prioritizes control over the checkout process and values a seamless, code-free solution built on Checkout Extensibility. Fly Bundles excels in its versatility, providing a range of bundling and discounting options to encourage larger purchases. It caters to merchants seeking readily deployable solutions and emphasizes ease of implementation and ongoing support, indicating a lower technical barrier to entry.
At a Glance
C Builder | Checkout Upsells!
9 reviews
Fly: Bundles & Quantity Breaks
257 reviews
Detailed Overview
C Builder | Checkout Upsells!
Customize your Thank you and Order status pages. Only Plus merchants can customize checkout.
Key Features
- Drag-and-drop checkout blocks built on Shopify Checkout Extensibility
- Upsells and cross-sells to increase AOV at the point of purchase
- Conditional logic to show content based on cart, customer, or order
- Add trust badges, custom text, and branded content to checkout
- Fast, secure, and upgrade-safe with full Shopify Plus compatibility
Fly: Bundles & Quantity Breaks
Maximize AOV with product bundles, combos, quantity breaks, volume discounts, upsells, FBT & BOGO
Key Features
- Boost cart value with a Fixed Bundle, BOGO or Frequently Bought Together blocks.
- Drive bulk sales with tiered Quantity Break and Volume Discount triggers.
- Incentivize larger carts with a Free Gift and automated bundle upsell tools.
- Build well integrated, beautiful native widgets with zero impact on store speed
- Breakdown of bundles for auto discounting, inventory sync, fulfilment, & return
Feature Comparison
| Rating | 5/5 | 5/5 |
Rating C Builder | Checkout Upsells!5/5 Fly: Bundles & Quantity Breaks5/5 | ||
| Reviews | 9 | 257 |
Reviews C Builder | Checkout Upsells!9 Fly: Bundles & Quantity Breaks257 | ||
| Target Merchant | Shopify Plus | All Shopify Plans |
Target Merchant C Builder | Checkout Upsells!Shopify Plus Fly: Bundles & Quantity BreaksAll Shopify Plans | ||
| Checkout Customization | Yes, via Checkout Extensibility | No, uses widgets |
Checkout Customization C Builder | Checkout Upsells!Yes, via Checkout Extensibility Fly: Bundles & Quantity BreaksNo, uses widgets | ||
| Upsell Method | Checkout page integration | Bundles, quantity breaks, BOGO, FBT widgets |
Upsell Method C Builder | Checkout Upsells!Checkout page integration Fly: Bundles & Quantity BreaksBundles, quantity breaks, BOGO, FBT widgets | ||
| Ease of Use | Drag-and-drop, no-code for Checkout Extensibility (Shopify Plus specific) | Zero coding required, 24/7 support |
Ease of Use C Builder | Checkout Upsells!Drag-and-drop, no-code for Checkout Extensibility (Shopify Plus specific) Fly: Bundles & Quantity BreaksZero coding required, 24/7 support | ||
| Value Proposition | Highly customized, secure checkout upsells for Shopify Plus | Versatile bundling and discounting for increased AOV |
Value Proposition C Builder | Checkout Upsells!Highly customized, secure checkout upsells for Shopify Plus Fly: Bundles & Quantity BreaksVersatile bundling and discounting for increased AOV | ||
| Key Technology | Shopify Checkout Extensibility | Widget-based implementation |
Key Technology C Builder | Checkout Upsells!Shopify Checkout Extensibility Fly: Bundles & Quantity BreaksWidget-based implementation | ||
- Conversion Audit
- Speed Audit
- SEO Audit
Conversion Audit
Our Verdict
For Shopify Plus merchants seeking deep customization and control over the checkout experience, C Builder | Checkout Upsells! is the clear choice, leveraging the power of Checkout Extensibility. It offers the potential for highly targeted and effective upsells directly within the checkout flow. However, due to the limited number of reviews as of 2026, merchants may want to carefully evaluate its functionality and support.
For merchants on other Shopify plans, or those seeking a broader range of bundling and discounting options with easier implementation, Fly: Bundles & Quantity Breaks provides a more accessible and versatile solution. Its widget-based approach allows for quick deployment, and its extensive feature set offers various strategies to increase AOV without the need for code. The higher number of reviews also suggests a more established user base and potentially more readily available community support.
Common Questions
Which app is easier to set up and use?
Fly: Bundles & Quantity Breaks is likely easier to set up and use due to its widget-based approach and emphasis on zero coding and 24/7 support. C Builder | Checkout Upsells! requires a Shopify Plus plan and familiarity with the Checkout Extensibility framework, although it aims to be no-code once within that environment.
Which app is more secure and upgrade-safe?
C Builder | Checkout Upsells! explicitly highlights its security and upgrade-safety due to being built on Shopify Checkout Extensibility, making it fully compatible with Shopify updates. Fly: Bundles & Quantity Breaks relies on widgets, which can sometimes be affected by theme updates, although the app description claims zero impact on store speed.
Which app offers more advanced targeting capabilities?
C Builder | Checkout Upsells! offers more advanced targeting capabilities through its conditional logic feature, allowing merchants to show content based on cart, customer, or order attributes, enabling highly personalized checkout experiences. Fly: Bundles & Quantity Breaks focuses more on broader bundling and discounting strategies rather than personalized targeting.
Can Fly: Bundles & Quantity Breaks be used on Shopify Plus?
Yes, Fly: Bundles & Quantity Breaks can be used on Shopify Plus, but it doesn't leverage the Checkout Extensibility features unique to Shopify Plus. Therefore, C Builder | Checkout Upsells! may offer a better tailored checkout customization experience for Plus merchants who want to utilize that capability.
Which app is more future-proof?
C Builder | Checkout Upsells!, due to its utilization of Shopify's Checkout Extensibility, is likely to be more future-proof, as it directly integrates with Shopify's evolving platform. Fly: Bundles & Quantity Breaks relies on widget integrations, which may require updates to maintain compatibility with future Shopify updates.
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