Sleek Bundles Upsell is a product bundle and upsell app for Shopify, built by Ecom Swift LLC (formerly M_SE0). It now supports every major bundle type in one install, applies discounts automatically at checkout through Shopify Functions, and ships with a free plan that is genuinely enough to run a new store.
👉 Install Sleek Bundles Upsell on the Shopify App Store — free plan available, no theme code, live in minutes.
Every bundle type in one install
Most merchants end up stacking two or three apps to cover volume discounts, "buy it with" offers and free-gift promos. Each one injects its own script, each one fights the theme, and each one takes its own slice of page weight. Sleek Bundles Upsell covers all six patterns from a single Shopify app:
- Frequently Bought Together — curated "buy it with" sets added in one click
- Quantity Breaks — tiered volume pricing, buy more and save more
- Mix & Match — shoppers pick any N items with a live savings meter
- BOGO / Buy X Get Y — free gifts and discounted add-ons
- Bundle Kits — curated fixed-price sets
- Cart Upsell — offers on the cart page and in the cart drawer
Every type can render on the product page, the cart page or the cart drawer, in Spotlight, Grid or Stack layouts.
Frequently Bought Together in Sleek Bundles Upsell, the Shopify bundle app by Ecom Swift LLC.
Quantity breaks: the simplest AOV lever there is
Tiered volume pricing is still the highest-leverage bundle for most catalogues, because it needs no second product and no merchandising decision. Sleek Bundles Upsell renders the tiers inline with save badges, an optional countdown timer and an optional Subscribe & Save toggle, then lets Shopify apply the discount itself.
Quantity Breaks: tiered volume pricing rendered directly on the Shopify product page.
Mix & Match, where the shopper does the merchandising
Pick-any bundles work well for catalogues with a lot of similar SKUs — flavours, colours, scents, sizes. The progress bar is doing real work here: an unfinished bundle is a visible open loop, and shoppers close it.
Mix & Match: shoppers pick any items and watch the savings meter fill.
BOGO and free gifts that resolve at checkout
Buy X Get Y is where most bundle apps get fragile, because the free item has to survive quantity edits, variant swaps and the cart drawer. Sleek Bundles Upsell keeps the gift as a real line item and lets Shopify Functions zero it out at checkout, so the cart and the checkout never disagree.
BOGO: buy X, get Y free — the gift unlocks automatically at Shopify checkout.
Bundle Kits check out as a single line item
This is the detail that matters most operationally. A curated kit resolves to one line item at checkout, which means clean packing slips for the warehouse and unfragmented analytics for you. Kit revenue shows up as kit revenue instead of scattering across three component SKUs.
Bundle Kits: a curated, fixed-price set that resolves to one line item at checkout.
The Stack layout
The Stack is the signature layout — clear rows, instant savings, one-tap add to cart. It is deliberately boring in the way good commerce UI should be: the offer, the saving and the button, with nothing between them. There is a live preview editor, so you can see the change before it hits the storefront, and it works with dark themes. The app ships in English and German.
The Stack layout: clear rows, instant savings and one-tap add to cart.
Why there are no discount codes
Sleek Bundles Upsell applies bundle discounts through Shopify Functions, not discount codes. Practically, that means the saving is already applied when the shopper reaches checkout — there is no code field to find, no "why did my discount not apply" support ticket, and no last-second price change that costs you the order. It also means no theme code edits and no leftover snippets when you uninstall.
Pricing, including a free plan that is actually usable
A lot of Shopify apps advertise a free plan that is really a demo. This one is not.
| Plan | Price | What you get |
|---|---|---|
| Basic | Free | 5 of 6 bundle types (Quantity Breaks, BOGO, Mix & Match, Bundle Kits, Frequently Bought Together), product page placement, 7-day analytics, up to $1K/mo bundle revenue |
| Growth | $9.99/mo | Unlimited bundles, cart upsells, Subscribe & Save, urgency timers, 30-day analytics, up to $10K/mo |
| Pro | $19.99/mo | Automatic cart upsell, trust badges, one-click deploy, 90-day analytics, up to $25K/mo |
| Premium | $29.99/mo | No revenue cap, device targeting, scheduling, smart add-ons, free developer setup |
Annual billing saves 20%, and every paid plan includes a 3-day free trial. For a new store, the free plan is enough — five bundle types on the product page with automatic checkout discounts, at zero cost, until the bundles are actually earning.
Try it on your own store
The fastest way to judge a bundle app is to install it, build one quantity break on your best seller and watch the analytics for a week. Sleek Bundles Upsell is free to start, needs no theme code and uninstalls cleanly.
👉 Get Sleek Bundles Upsell free on the Shopify App Store
Built and supported by Ecom Swift LLC. If you run bundles on Shopify, I would like to hear which type actually moves AOV for you — quantity breaks or frequently bought together. In my experience it is almost never the one merchants expect.
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