Companies Using Code Black Belt

The first thing I check on any profile is what the rule catches. For Code Black Belt it's any script from codeblackbelt.com, and that turned out to need a correction. Code Black Belt, a Zaragoza developer owned by Shop Circle since 2023, has seven Shopify apps, from Frequently Bought Together to a video background, and all of them load from its servers. After the correction, our October 2026 crawl finds 16,455 live domains, 1st of 33 in Cart & Checkout with 21.42%, and we matched 5,801 of them to a company.

Code that no longer runs

Code Black Belt's current apps load from addresses under /widgets/. Older installs pasted a different address, under /js/modules/, into the store's theme, and the vendor's server now answers those requests with "410 Gone" or an error. The address stays in the theme after the app stops, so our rule kept counting the store. On 14 October we fetched all 19,579 homepages: 13,555 loaded a current address and 3,124 carried only retired ones, and we removed those 3,124. Most of the dead code is old Frequently Bought Together (1,561 stores), then the shipping calculator (627) and Also Bought (416). Another 1,822 domains showed no Code Black Belt code to our fetcher and about 1,080 didn't answer; they stay in, because one failed fetch isn't proof of removal.

Sales signal: a store with only the retired script left in its theme once installed an upsell app and stopped using it. It's most likely a former Code Black Belt customer, and its theme tells you which app it used.

One main app

Of the 13,555 stores with a current address, 8,668 run Frequently Bought Together, 2,060 Also Bought, 1,378 the Shipping Rates Calculator, 924 Currency Converter Plus and 460 Add To Cart Anywhere. Only 492 run two or three. The App Store numbers match: Frequently Bought Together CBB showed 1,208 reviews on 14 October 2026, more than the other six apps' combined 1,027. The usage chart has one point because the cut comes from that single fetch. Since 4 August 2026, 1,512 domains dropped Code Black Belt on at least one hostname, and 199 still run it on another.

"Most live Code Black Belt stores run one app, Frequently Bought Together. The bigger correction to our raw count was the old script still sitting in themes after the app stopped." - David Thomson, CTO at TechnologyChecker.io

Sales signal: treat the list as a Frequently Bought Together list with extras. If you sell a bundle or cross-sell tool, this is the incumbent you're replacing.

Established small stores

67.94% of matched companies with a known size have 1 to 10 employees, and 91.02% have 50 or fewer. They are older than the other suites' customers: 48.84% were founded in the 2010s and only 18.49% in the 2020s, against 34.56% on KaktusApps's profile. 54 companies have more than 500 staff, among them Goya Foods, which runs Frequently Bought Together on shop.goya.com, and HarperCollins UK. Daniel Wellington and Lonely Planet run it too, and AVI-SPL, Renold and Spectrum Plastics use Also Bought on parts and equipment stores.

Sales signal: these owners have run their stores for years and picked their upsell app long ago. Pitch a measurable gain over the app they already have.

English-speaking, retail-led

The United States has 2,499 matched companies, the United Kingdom 632, Australia 427 and Canada 343; with New Zealand's 62 that is 3,963. India (274) is fifth, and Germany (154), Spain (98) and France (85) lead continental Europe. Retail is 21.01% of matched companies and Retail Apparel and Fashion 8.96%. Manufacturing (4.88%) is higher here than on KaktusApps's profile (2.96%) or AOV.ai's (3.9%), and Wholesale adds 2.42%, a sign of B2B sellers.

Sales signal: the manufacturing and wholesale stores are the underserved group. They run consumer-style upsell apps on parts catalogues, and B2B quoting or reorder tools fit them better.

Rivals in the same theme

The category table sets Code Black Belt beside CartBot (8,297 domains), AOV.ai (6,351), Product Customizer (5,398) and KaktusApps (4,407). 199 domains run CartBot and Code Black Belt today, out of 237 ever seen with both. Product Customizer shares 150 (166 ever), AOV.ai 126 (138) and KaktusApps 103 (108). Our switching tests reject all four pairs, because most stores that ever ran both still do. They do different jobs: a free gift, a product option, a cross-sell.

"Stores here don't pick one app vendor. 199 run CartBot next to Code Black Belt, and 84% of the stores ever seen with both still have both." - David Thomson, CTO at TechnologyChecker.io

Sales signal: a rival can sell next to Code Black Belt without displacing it. A direct replacement pitch has to beat Frequently Bought Together on its own ground.

Reviews and email beside it

On the 16,455 domains behind these shares, Judge.me sits on 34.09% and Loox on 9.97%. Frequently Bought Together pulls star ratings from Judge.me and Loox, so the pairing is practical. Klaviyo email is on 39.25%, Mailchimp on 12.16% and Google Analytics on 75.98%. Instafeed (16.8%) and Hextom (12.34%) are the most common other app vendors.

Sales signal: about three in five stores here don't run Klaviyo email. For an email or SMS vendor, an established Shopify store with an upsell app already installed is a good fit.

What it costs

Frequently Bought Together CBB's App Store listing (checked 14 October 2026) has a free Starter plan with up to three manual bundles, then $9.99, $24.99 and $39.99 a month for stores with up to 50, up to 500 and more than 500 orders a month, with a 14-day trial. It launched on 15 March 2017.

Sales signal: a store crossing 500 orders a month goes from $24.99 to $39.99. That jump is the easiest opening a flat-priced rival will get.

Key takeaways

1. 16,455 live domains after removing 3,124 that carry only retired scripts, 1st of 33 in Cart & Checkout with 21.42%.

2. Frequently Bought Together runs on 8,668 of the 13,555 stores we fetched with a current address.

3. An older base: 18.49% founded in the 2020s, against 34.56% for KaktusApps.

4. CartBot, AOV.ai and KaktusApps sit beside it on the same stores rather than replacing it.

How to use this list

Filter by app first, then by country and size. For the full list of 16,455 Code Black Belt domains with company, size and stack data, explore TechnologyChecker.io.