If you are searching for Fast Bundle alternatives, you probably want one of three things: more placements than the product page, fewer separate apps, or a different pricing curve as your store grows. Fast Bundle is a bundle app many merchants use, so the useful question is not “which app is better?” but “which gap am I trying to close?”
A note on transparency: Moon Bundles is our app, and it is one of the options below. We do not quote prices, ratings or conversion figures for Fast Bundle, only what an app of this kind generally does, so confirm its current features and plans on its own Shopify App Store listing. Where our comparison pages hold dated figures for other apps, we link to them.
Why Look for a Fast Bundle Alternative?
Bundle apps such as Fast Bundle focus on the product page: fixed bundles, mix and match, and volume discounts. For a store that only needs those offers, that is a complete answer. The reasons to look elsewhere are usually about scope:
- One surface is not enough. Bundles on the product page do not touch the cart drawer or the moment after checkout, where many buying decisions are still open.
- You want free gifts or progress bars that react to the cart value, in the same app as your bundles.
- You want fewer apps and fewer scripts on the storefront.
- You want to measure offers. Without A/B testing, you change offers without knowing what each one earns.
- Pricing fit. Plan limits and price tiers differ from app to app and change over time.
Use the same checklist for every app you trial: offer types, funnel coverage, A/B testing, theme impact and pricing model. The metric behind all of them is average order value, so read our guide to Shopify average order value before you set a target.
The Alternatives at a Glance
Coverage below follows our comparison pages, as of August 31, 2026. We have not built a comparison page for Fast Bundle, so it is not in the table.
| App | Best known for | Cart drawer | Post-purchase upsell | A/B testing |
|---|---|---|---|---|
| Moon Bundles | Four modules in one install: bundles, volume discounts, free gifts, cart drawer | Included | Included | Included |
| Kaching Bundles | Bundles, with a large review base | Separate app | Separate app | Included |
| Rapi Bundles | Bundles, volume discounts and post-purchase in one app | Not covered | Included | Included |
| Amose Bundle | Wide scope at a low price | Included | Included | Not covered |
| UpCart | Cart drawer specialist | Included | Not covered | Not covered |
| AfterSell | Post-purchase specialist | Not covered | Included | Included |
“Separate app” means the module exists but is sold as another app with its own plan. UpCart and AfterSell are both published by Rokt, and neither is listed on the Shopify App Store since October 2026. Check their current availability with the publisher before planning a switch. The figures in our comparison pages for these two are dated and should not be read as current.
How Each Alternative Differs
Moon Bundles
Moon Bundles combines bundles, volume discounts, free gifts and a cart drawer with upsells, plus a one-click post-purchase upsell, in a single install. The free Discovery plan runs up to $500 of generated revenue with one module of your choice. Paid plans cost $19.99, $39.99 and $79.99 a month, each includes all four modules and A/B testing across modules, and starts with a 7 day free trial. See the pricing page for the details.
It is AI-powered in two concrete ways: an MCP connector on every plan, the free one included, which lets you work from Claude, ChatGPT or Gemini with nothing shipping until you approve it, and Agents that follow your offer results and prepare the next tests, which you can start from Claude Cowork.
Where it is weaker: a younger app with a less established bundle editor than the long-running bundle specialists, and a first paid plan that is not the cheapest on the list.
Kaching Bundles
Kaching Bundles is a bundle specialist with a large base of public reviews and a mature bundle editor. Its cart drawer and post-purchase upsell are separate apps, billed separately. If you only need bundles and want the most established name, it is a strong choice. See Kaching Bundles alternatives and Moon Bundles vs Kaching Bundles.
Rapi Bundles
Rapi Bundles covers bundles, volume discounts, a post-purchase upsell and A/B testing in one app. It does not cover a cart drawer or free gifts unlocked by cart value. It is a sensible move if you want post-purchase next to your bundles and do not need the cart layer. See Rapi Bundles alternatives and Moon Bundles vs Rapi Bundles.
Amose Bundle
Amose lists bundles, quantity breaks, gifts, a cart drawer and post-purchase offers, and its unlimited plan is the cheapest in our comparison. Its listing does not mention A/B testing, which means changing offers without measuring what they earn. See Moon Bundles vs Amose Bundle.
UpCart
UpCart is a cart drawer specialist, with announcements, a sticky cart, countdown timers, rewards and tiered progress bars. If the cart is the only thing you want to change, a dedicated tool is a defensible choice. It does not cover bundles or post-purchase, so you would keep other apps next to it. See Moon Bundles vs UpCart.
AfterSell
AfterSell has the deepest post-purchase funnel we compare: upsells and downsells, a drag-and-drop editor, and checkout upsells on Shopify Plus. If post-purchase is your whole strategy, it goes deeper than Moon Bundles. It does not cover bundles, volume discounts, gifts or a cart drawer. See Moon Bundles vs AfterSell, and our guide to the Shopify post-purchase upsell.
Other bundle apps
Many other bundle apps exist, and we do not quote figures for them. Whichever you shortlist, check the same points on each listing: which bundle types it supports, whether variants carry correctly into the order, and whether the cart drawer and post-purchase offers are included or need another app. For a wider view, see our guides to the best Shopify bundle app, Bundler app alternatives and WIDE Bundle alternatives.
Which Alternative Fits Your Store?
- You want bundles, a cart drawer and a post-purchase upsell in one app: Moon Bundles, or Amose Bundle if price is the deciding factor.
- You want post-purchase in the same app as your bundles, but not a cart drawer: Rapi Bundles.
- Bundles are your whole strategy and reviews matter to you: Kaching Bundles.
- The cart is your only leak: UpCart, alongside your other apps.
- Post-purchase is your main lever: AfterSell, especially on Shopify Plus.
- Product page bundles are all you need and they already work: stay on Fast Bundle. Switching for layers you do not need costs time and risks conversion.
For a wider view of the category, see our guide to how to bundle products on Shopify.
What to Check Before Switching
- Inventory your live offers: every bundle, discount tier and gift, with products, prices and conditions. Offers may need to be recreated in the new app.
- Record a baseline: conversion rate, average order value and revenue per visitor over a representative period. Save any app-specific reports you need before switching.
- Test variants, discounts and checkout with the new bundles, on mobile as well as desktop.
- Read the current plan details on the listing, since limits and prices change.
- Run both setups against each other and switch only when the new offers match or beat the baseline.
- Remove leftover scripts and disable the old app once nothing duplicates.
Frequently asked questions
Is Fast Bundle a bad app?
No. It is a bundle app many merchants use, and if product page bundles are your main need, it can be the right tool. People look for alternatives when they also want a cart drawer, post-purchase offers or gifts in the same install, or a different pricing model. If none of that applies, there is no reason to switch.
Which alternative covers the most modules in one app?
On the modules we compare (bundles, volume discounts, free gifts, cart drawer, post-purchase upsell and A/B testing), Moon Bundles covers all six in one install. Amose Bundle lists five of them on paper, without A/B testing. Check each listing before deciding.
Can I test Moon Bundles without paying?
Yes. The Discovery plan is free up to $500 of generated revenue and includes one module of your choice. Every paid plan starts with a 7 day free trial and includes all four modules; the MCP connector comes with every plan. See the pricing page for the plans.
What does AI-powered mean for Moon Bundles?
Two concrete things. Every plan, the free one included, comes with an MCP connector, so you can drive the app from Claude, ChatGPT or Gemini, and nothing ships until you approve it. And Moon Bundles Agents watch your offer results with you and prepare the next tests. It does not mean guaranteed results.
Will my Fast Bundle offers transfer automatically?
Do not assume they will. Bundles, discount tiers and designs may need to be recreated in the new app. Document your current setup first, then test each offer with the relevant products before making it visible to customers.
Should I run Fast Bundle and a new app at the same time?
Only during a controlled test. Two apps showing offers in the same place can overlap or conflict. Test the new app on a limited set of products, compare revenue per visitor against your baseline, then retire the old app once nothing duplicates.
