Fly Upsell & Cross Sell vs Sleek Bundles App
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 9, 2026 for Fly Upsell & Cross Sell, Nov 4, 2026 for Sleek Bundles.
The short answer
- On the Shopify App Store: Fly Upsell & Cross Sell 4.9 from 619 reviews and Sleek Bundles 4.9 from 10 reviews.
- Only Fly Upsell & Cross Sell lists a free plan.
- Fly Upsell & Cross Sell lists 11 features Sleek Bundles’s listing doesn’t mention, including Bundles, Custom CSS, Drag-and-drop editor.
Head to head
- United States
- United Kingdom
- India
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Free
- · AI Upsell and Frequently Bought Together
- · Advanced analytics
- · Design customisations
- · Includes Only 1 Upsell Offer
- · Multi-language
- · Multiple Layouts and Templates
Growth
- · AI Upsell and Frequently Bought Together
- · Advanced analytics
- · Design customisations
- · Multi-language
- · Multiple Layouts and Templates
- · Priority onboarding and live support
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureEvery visitor leaving with one item is a missed opportunity. Fly Bundles plugs profit leaks with high-conversion product bundle kits and combos. Use bulk discounting or a Fixed Bundle to turn tiny carts into massive orders. Our bundle upsell engine, FBT blocks, and quick add-ons make buying more the natural choice. Scale with Quantity Breaks, subscriptions, and progressive free gifts.
Create product bundles with nine types: Quantity Breaks (volume discounts), Mix & Match, Frequently Bought Together, Buy X Get Y (BOGO), Fixed Classic Kit, Configurable Variants Kit, Variants Bundle, Product Add-Ons and Cart Add-On Upsell. Widgets sit on your product pages and in your cart drawer and use your theme's own Add to cart. Discounts apply at checkout through Shopify Functions, with no codes.
- Customizable Bundle Upsells, Volume Bundles, & Fixed bundles on Product page
- Using latest Shopify Bundles Tech for inventory management of individual SKU's
- Set offers like '%' & '$' Off on Bundle, BOGO, Tiered Volume discounts and more
- Customizable Widget UI, Branding & Messaging to match with your store's design
- 6 bundle types: FBT, Quantity Breaks, Mix & Match, BOGO, Kits, and Cart Upsell
- Automatic discounts at checkout via Shopify Functions — no codes
- Stack, Spotlight, or Grid layouts per bundle, with live preview
- Cart page and cart drawer upsell with AI-powered product suggestions
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  Fly Upsell & Cross Sell |  Sleek Bundles |
|---|---|---|
| Detected stores | 1,067 | Not published |
| Net store change, 28 days | −41 | 0 |
| Stores added, 28 days | 7 | Not enough data |
| Big-brand share | 15% | Not enough data |
| Top store categories | Apparel & Accessories, Health & Beauty, Home & Garden | Not published |
| Top store countries | United States, United Kingdom, India | Not published |
Reviews
| Measure | Fly Upsell & Cross Sell | Sleek Bundles |
|---|---|---|
| App Store rating | 4.9 ★ | 4.9 ★ |
| App Store reviews | 619(ahead) | 10 |
| New reviews, 28 days | 2 | Not enough data |
| Reviewers a year or more in | 5% | Not enough data |
Pricing
| Measure | Fly Upsell & Cross Sell | Sleek Bundles |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $15/month | No monthly plan listed |
| Longest free trial | 10 days | Not listed |
| Plans listed | 2 | Not published |
Listing
| Measure | Fly Upsell & Cross Sell | Sleek Bundles |
|---|---|---|
| Shopify category rank | #38 | #90 |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | Yes | No |
| Launched | Jan 3, 2024 | Jul 9, 2026 |
| Languages | 1 | 1 |
| Developer | Skai Lama | Ecom Swift LLC (Formerly M_SE0) |
FAQ
Fly Upsell & Cross Sell and Sleek Bundles: common questions
- Is Fly Upsell & Cross Sell or Sleek Bundles cheaper?
- Only Fly Upsell & Cross Sell lists a free plan. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Which has better reviews, Fly Upsell & Cross Sell or Sleek Bundles?
- On the Shopify App Store: Fly Upsell & Cross Sell 4.9 from 619 reviews and Sleek Bundles 4.9 from 10 reviews.
- What features does each app list that the other doesn’t?
- Fly Upsell & Cross Sell lists 11 the others don’t mention, such as Bundles, Custom CSS, Drag-and-drop editor, Dynamic pricing. Sleek Bundles lists 11 the others don’t mention, such as AI recommendations, Build a box, Cart discounts, Cart drawer. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Nov 9, 2026 for Fly Upsell & Cross Sell, Nov 4, 2026 for Sleek Bundles; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Nov 9, 2026 for Fly Upsell & Cross Sell, Nov 4, 2026 for Sleek Bundles. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.