The short version
Where Freebies Engine fits. A step-by-step bundle page with quantity tiers, billed at a flat price with no usage fees.
Choose Kaching Bundles or Fast Bundle if
- You want the widest list of bundle formats, from subscription boxes to wholesale and digital bundles.
- You want bundle A/B testing inside the bundle app today.
Choose Freebies Engine if
- Shoppers should build their own set step by step, on a page or in any theme section.
- You want a price that does not grow with your bundle revenue.
Bundle Builder is the build-your-own-bundle mini app inside Freebies Engine by Log Studio Lab: shoppers pick products step by step on a page or in a theme section, and a bigger bundle earns a bigger discount. Kaching Bundles and Fast Bundle are the two bundle apps with the most reviews among the bundle listings we read on the Shopify App Store on 2026-10-23 (6,449 and 3,585 reviews; Bundler, the next one we read, shows 2,750). This page compares the three for one job: letting shoppers assemble their own bundle. Every Kaching and Fast Bundle fact comes from its own Shopify App Store listing as of 2026-10-23.
At a glance
| Feature | Kaching Bundles | Fast Bundle | Bundle Builder by Log Studio Lab |
|---|---|---|---|
| Listed since | August 11, 2022 | November 26, 2020 | Not compared |
| Rating on its listing | 5.0 from 6,449 reviews | 5.0 from 3,585 reviews | Not compared |
| Built for Shopify badge on its listing | Yes | Not shown | Not compared |
| Build-your-own bundle | Its description names a "simple bundle builder"; no build-a-box type is listed | A "Build a box" bundle type and a "Bundle Builder" named in its description | Step by step, up to 10 steps, on its own page or as a section on any template (setup guide) |
| Where step products come from | Not compared | Not compared | Picked products, collections, tags, a vendor, a product type or the whole store |
| Discount shape | Tiered discounts listed | Tiered discounts listed | Up to 10 tiers by quantity, one percentage off, a fixed bundle price or no discount |
| How plans are sized | Additional revenue covered | Monthly bundle sales covered | A flat price with no usage fees (pricing) |
| Free trial | 7 days on paid plans | 7 days on paid plans | 15 days when it starts a new Shopify charge |
| A/B testing | Listed under analytics | Listed under analytics | Not compared |
Pricing of the two apps as listed on 2026-10-23
From each Shopify App Store listing, in USD, billed every 30 days. Both are free to install on development stores.
| App | Plan | Price per month | What the plan covers |
|---|---|---|---|
| Kaching Bundles | Starter | $14.99 | Up to $1,000 of additional revenue |
| Kaching Bundles | Scale | $29.99 | Up to $5,000 of additional revenue |
| Kaching Bundles | Pro | $59.99 | Up to $10,000 of additional revenue |
| Fast Bundle | Standard (1K) | $19 | Up to $1,000 of monthly bundle sales |
| Fast Bundle | Standard (3K) | $49 | Up to $3,000 of monthly bundle sales |
| Fast Bundle | Standard (10K) | $139 | Up to $10,000 of monthly bundle sales |
Kaching lists yearly prices of $131.88, $263.88 and $539.88. Fast Bundle lists $180, $468 and $1,380 a year, and an Auto Bundle Detection add-on at $49 a month. Bundle Builder's price is on the pricing page, under Mini apps; it is a flat monthly price, whatever your visits, orders or revenue.
The difference that matters as you grow: both listed ladders step up with the revenue the app touches, so a store whose bundles sell well moves to a higher plan. A flat price stays where it is. Work out your own bundle revenue per month before you compare, and use the bundle app pricing comparison for the full ladders of four apps.
What a build-your-own bundle page needs
A shopper building a set has three questions on every step: what can I pick here, what have I got so far, and how far am I from the next saving. Bundle Builder answers them on the page itself:
- Steps with their own products. Each step offers the products or collections you chose for it, and you choose whether shoppers see every step on one page, one step at a time or a single list.
- A summary in view. What they picked, the running total and what they save stay visible, beside, below or above the products on desktop.
- The next tier. Shoppers see how close they are to the next discount tier as they pick.
- One card in the cart. The bundle can show as one card in the cart drawer and cart page, with the original price, the bundle price and the saving (cart card guide).
- Checkout does the math. The discount is applied by Shopify at checkout, not by theme code, and the editor warns you when no discount applies.
The Bundle builder page template is described as "A page where shoppers build a box step by step." See the Bundle Builder page for the live demo and the storefront file sizes.
Where Kaching Bundles and Fast Bundle are stronger
- More bundle formats. Kaching's listing names fixed, multipack, mix-and-match, variant, infinite option, subscription box, wholesale, upsell, cross-sell, digital and custom bundles. Fast Bundle's adds build a box, gift box and physical product bundles. Bundle Builder does one format: the step-by-step bundle a shopper assembles.
- A/B testing in the same app. Both listings name A/B testing under analytics.
- Track record. Both show a 5.0 rating, with thousands of reviews, and Kaching shows the Built for Shopify badge, as of 2026-10-23. We do not compare ratings.
- Wider integration lists. Both list page builders such as PageFly and GemPages under "Works with". Fast Bundle also lists subscription apps such as Appstle and Seal Subscriptions.
- AI features. Fast Bundle lists AI frequently bought together suggestions and an AI bundle image generator on its paid plans.
- A lower entry price for small bundle revenue. If your bundles bring in under $1,000 a month, Kaching's $14.99 Starter plan is a low starting point.
Who should choose which
- Kaching Bundles if you want many bundle formats and tiered offers from one app, with the Built for Shopify badge.
- Fast Bundle if you sell build-a-box, gift box or subscription box bundles and want AI suggestions next to them.
- Bundle Builder if the build-your-own page is the main bundle you sell, you want it on a page or in any theme section, and you want a flat price that does not grow with bundle revenue. It sits next to the other mini apps and the offers of Freebies Engine by Log Studio Lab, so Quantity Breaks and gift offers run from the same admin.
FAQ
Which bundle apps have the most reviews on the Shopify App Store? Of the bundle listings we read on 2026-10-23, Kaching Bundles shows 6,449 reviews, Fast Bundle 3,585 and Bundler 2,750. Counts change daily, so check each listing.
Do Kaching Bundles and Fast Bundle charge more as bundle sales grow? Their listed plans are sized by additional revenue (Kaching) or monthly bundle sales (Fast Bundle), so a store that sells more bundles moves to a higher plan. Bundle Builder has a flat price with no usage fees.
Can Bundle Builder run on any page of my theme? Yes. It works on a page of its own or as a section on any template, placed in the theme editor without changing theme code. The setup guide walks through both.
How many steps and tiers can one bundle have? Up to 10 steps and 10 discount tiers. A step that draws on more than 250 products from a collection, a search or the whole store gets no checkout discount, so keep large steps narrow with a collection or a tag.
Do I need an app to sell bundles at all? Shopify's Help Center says you must have a bundles app installed to create bundles. See Shopify's bundles or an app and the build-a-box bundle guide.
Related
- Use cases: Mix-and-match bundles, Classic bundles
- Head to head: Freebies Engine by Log Studio Lab vs Kaching Bundles, Freebies Engine by Log Studio Lab vs Fast Bundle
- Reading: Bundle pricing strategy, Fixed vs mix and match bundles
About this comparison
Product names are trademarks of their owners. Information is from public sources (listed under Sources) and was read on 2026-10-23, so prices, plans and counts may have changed since. We are not affiliated with Kaching Bundles, Fast Bundle or Bundler. If you see an error, tell us through the contact page and we will correct it.
Sources
- Shopify App Store: Kaching Bundles App & Upsells (listing) (accessed October 23, 2026)
- Shopify App Store: FBP | Fast Bundle & Upsell App (listing) (accessed October 23, 2026)
- Shopify App Store: Bundler » Product Bundles App (listing, review count only) (accessed October 23, 2026)
- Shopify Help Center: Product bundles (accessed October 11, 2026)