You test offers constantly
If pricing, layouts, and discount structures are things your team changes every week, Rapid Bundles puts experimentation at the centre of the workflow, with traffic splitting and automatic winner selection built in.
Comparisons
What kind of bundle strategy are you building for?
Rapid Bundles and Fast Bundle overlap on many core features, including Mix & Match bundles, BOGO offers, upsells, subscription bundles, and bundle builders. The main difference is how each app approaches growth: Rapid Bundles puts more emphasis on testing and optimizing offers, while Fast Bundle focuses more on flexible bundle architecture, AI-assisted merchandising, and scaling bundle strategies across the store.
Rapid Bundles emphasizes A/B testing and offer optimization. Fast Bundle puts more emphasis on broader merchandising workflows and flexible bundle strategies.
Rapid makes it easy to test pricing, layouts, and promotions. Fast Bundle gives merchants more ways to structure and manage bundles across different use cases.
Rapid is strong for fast experimentation. Fast Bundle is designed for merchants who want their bundling strategy to grow into a broader part of their merchandising operations.
Both apps cover many of the same core bundling use cases, but they differ in areas like experimentation, AI merchandising, bundle architecture, and advanced store workflows. Here’s how Fast Bundle and Rapid Bundles compare across the features that matter most.
| Capability | Fast Bundle | Rapid Bundles |
|---|---|---|
| Shopify App Store rating | 5.0 | 5.0 |
| Review count | 3.3K+ | 1.4K+ |
| Primary focus | Bundle merchandising, upsells & AI-assisted recommendations | Bundle experimentation, A/B testing & upsells |
| Best for | Merchants scaling a broader bundle and merchandising strategy | Merchants focused on testing and optimizing offers quickly |
| Lowest paid plan | From $19/mo | From $15/mo |
| Free plan | Development stores & eligible merchants | ✓ Public free tier |
| Free-plan revenue limit | Up to $500/mo in bundle sales for eligible stores | Up to $100/mo generated by Rapid |
| Pricing model | Based on monthly revenue generated through Fast Bundle | Based on monthly additional revenue generated through Rapid |
| Mix & Match bundles | ✓ Yes | ✓ Yes |
| Bundle Builder | ✓ Dedicated Bundle Builder | ✓ Bundle Builder available |
| Build a Box / BYOB | ✓ Supported | ✓ Dedicated Box Builder |
| BOGO / Buy X Get Y | ✓ Yes | ✓ Yes |
| Volume discounts & quantity breaks | ✓ Yes | ✓ Yes |
| Product add-ons & upsells | ✓ Built in | ✓ Built in |
| Frequently Bought Together | ✓ AI-powered FBT | ✓ FBT / Combo Bundles |
| Post-purchase upsells | Current positioning focuses on product page, cart & POS offers | ✓ Built-in post-purchase upsells |
| A/B testing | ✓ Supported | ✓ Advanced testing & traffic allocation |
| Automatic A/B test winner selection | No equivalent workflow publicly documented | ✓ Available |
| AI-assisted A/B testing | No equivalent feature publicly documented | ✓ Available on Elite |
| AI recommendations | ✓ AI-powered FBT | ✓ AI upsells documented |
| AI bundle image generation | ✓ Included | ✕ No equivalent image generator documented |
| AI bulk editing | ✓ Available | ✕ No equivalent workflow documented |
| Bundle as Product | ✓ Dedicated Bundle-as-Product workflow | No equivalent BAP workflow publicly documented |
| Subscription bundles | ✓ Subscription app integrations | ✓ Supported via subscription apps |
| Shopify Markets targeting | Multi-market capabilities vary by workflow | ✓ Market-specific bundles documented |
| Customization | High — CSS, HTML, rules & multiple display options | High — CSS, templates, swatches & dynamic variables |
| Shopify POS support | ✓ Shopify POS workflows | ✕ No POS integration publicly documented |
| Enterprise / API tooling | ✓ Enterprise plan, POS, cart detection & account manager | ✓ API, MCP & custom enterprise features |
| Languages | 10 languages | 6 languages |
| Strongest differentiator | AI merchandising + productized bundle workflows | Advanced experimentation + A/B testing |
Rapid Bundles is particularly strong for Shopify merchants who want to launch offers quickly, test different ideas, and optimize bundle performance through experimentation. Its combination of A/B testing, flexible promotional offers, and accessible pricing makes it a strong option for conversion-focused teams.
Experimentation is a central part of the Rapid Bundles workflow. Merchants can test different bundle configurations, pricing, discounts, and layouts while splitting traffic between variations to understand which offer performs better.
Rapid Bundles supports a wide range of conversion-focused offers, including Build a Box, quantity breaks, BOGO, free gifts, upsells, and progress-based incentives. This gives merchants several ways to launch and iterate promotional ideas without relying on a single bundle format.
Rapid Bundles offers a public free tier and paid plans that start below Fast Bundle's current entry price. This can make it an attractive option for smaller Shopify stores that want to test bundling and upsell strategies before committing to a broader merchandising setup.
Rapid Bundles includes post-purchase upselling as part of its conversion toolkit. Merchants can extend the offer journey beyond the initial cart and present additional products after checkout, giving them another opportunity to increase order value.
Fast Bundle is designed for merchants who want bundling to become a broader part of their merchandising strategy. Its strengths go beyond launching individual promotions, with productized bundle workflows, AI-assisted merchandising tools, multiple bundle experiences, and more advanced options for growing Shopify stores.
Fast Bundle provides dedicated Bundle as Product workflows for merchants who want bundles to behave more like standalone products. This creates additional flexibility for merchandising bundles across product pages, collections, campaigns, and other parts of the storefront.
Fast Bundle combines AI-powered Frequently Bought Together recommendations with AI bundle image generation and AI-assisted bulk editing. These tools help merchants create, manage, and optimize larger bundle catalogs without relying entirely on manual merchandising.
Merchants can combine Mix & Match bundles, Bundle Builder experiences, BOGO offers, volume discounts, add-ons, Frequently Bought Together, and other bundle strategies within one platform. This makes Fast Bundle better suited to stores running several merchandising approaches at the same time.
Fast Bundle also provides more advanced workflows for stores with larger operational requirements, including Shopify POS support and enterprise-oriented capabilities such as cart detection, reporting, priority support, and account-level assistance.
Choose Rapid Bundles if your priority is quickly launching, testing, and optimizing bundle offers with built-in experimentation tools.
Choose Fast Bundle if you need productized bundle workflows, broader AI merchandising tools, and more advanced ways to scale bundling across your store.
Both apps cover the common Shopify bundling strategies. The better fit depends less on the feature list and more on where your store is right now: still validating whether bundling works, or already running it as an ongoing part of how you merchandise.
If pricing, layouts, and discount structures are things your team changes every week, Rapid Bundles puts experimentation at the centre of the workflow, with traffic splitting and automatic winner selection built in.
For a small store proving the concept before committing budget, the public free tier and the $15/mo starting plan make Rapid Bundles a low-friction first step.
If the thank-you page is where you want your next offer to appear, Rapid Bundles ships that natively. Fast Bundle currently focuses its offers on the product page, cart, and POS instead.
Mix & Match, BOGO, Build-a-Box, add-ons, volume discounts, and AI-powered Frequently Bought Together all live in one app, so a growing set of live offers does not turn into a stack of separate tools.
Bundle as Product gives a bundle its own product page, inventory behaviour, and place in collections and feeds, which matters once bundles need to appear in campaigns rather than only as a widget.
Fast Bundle supports Shopify POS workflows, so bundle pricing carries into in-store sales. Enterprise adds cart detection and a dedicated account manager for setups that need someone accountable.
The short version: choose Rapid Bundles if your next question is "which offer wins?" Choose Fast Bundle if you already know and your next question is "how do we run twenty of these without it breaking?"
Rapid Bundles is built around finding the best-performing offer. Built-in A/B testing with automatic winner selection, fast offer experimentation, post-purchase upsells, and a lower first paid plan make it a strong choice for merchants who are still working out which bundle converts.
Fast Bundle is built for what comes after that. Bundle as Product workflows, AI-powered Frequently Bought Together, AI bundle image generation, bulk editing, and Shopify POS support give growing stores the room to run bundling as an ongoing merchandising strategy rather than a series of tests.
The bottom line: choose Rapid Bundles if experimentation and finding the best-performing offer are your main priorities. Choose Fast Bundle if you need a bundling system that scales across more products, more channels, and more complex merchandising as your store grows.
Last updated September 2026. Shopify App Store figures verified at time of publication.
Fast Bundle and Rapid Bundles are built around different priorities. Rapid Bundles is especially strong for offer testing, A/B testing, and fast experimentation. Fast Bundle is a stronger fit for merchants who need broader bundle workflows, Bundle as Product, AI merchandising tools, Shopify POS support, and more advanced scaling options.
Rapid Bundles has the stronger documented A/B testing workflow. It supports testing different bundle configurations, prices, discounts, and layouts, with traffic splitting and automatic winner selection.
Fast Bundle is generally the better fit for stores that already use bundles as an ongoing merchandising strategy and need to manage multiple bundle types, productized bundles, AI-powered recommendations, POS workflows, and more advanced operational requirements.
Yes. Rapid Bundles supports Bundle Builder, Mix & Match, and a dedicated Box Builder experience. These features are not exclusive to Fast Bundle, so the main differences between the apps are more about experimentation, merchandising depth, AI workflows, and scale.
Yes, but there is no publicly documented one-click migration tool between the two apps. A safer approach is to recreate your active offers in Fast Bundle as drafts, test pricing, variants, subscriptions, and storefront placement, then activate the Fast Bundle offers before disabling the corresponding Rapid Bundles offers.
Switching may make sense when your needs move beyond testing individual offers and toward managing a broader bundling system. Common reasons include needing Bundle as Product workflows, more AI-assisted merchandising tools, Shopify POS support, or more advanced bundle and enterprise workflows.
