The Maze: A Polish audit of 567 online stores appears to hand IdoSell a knockout win. Nine in ten IdoSell stores cleared 60% of KAMAN's UX checklist, against just 20% on Shopify and 14% on WooCommerce. But this is not a sales table. It measures which stores implemented 94 conversion and monetization mechanics. The result says something useful about platform guardrails and merchant execution, while the sample sizes say just as much about how carefully the ranking should be read.
The top-line gap is enormous, even before interpretation begins. IdoSell reached 90% among 41 audited stores. Magento followed at 56% from 16 stores, while custom builds and Shoper landed at 41% and 40%. PrestaShop reached 34%, Shopify 20%, and WooCommerce 14%. That creates a 76-point spread between first and last. Yet the denominator changes with every row: WooCommerce has 171 stores, Shoper 122, PrestaShop 64, Shopify 44, IdoSell 41, custom builds 17, and Magento 16. Sky-Shop's eight stores appear in the wider distribution but disappear from the threshold summary. Small groups can move dramatically when only a few stores change bucket.
The audit scores implementation, not commercial output. Więch describes reviewing UX mechanics and ways to lift average order value before adding the store engine. KAMAN's public methodology explains 94 checks across the home page, product listing, product page, cart, checkout, and added monetization. Its earlier 328-store study found a 55% median and only 27% of stores above 60%. A checklist can reveal whether useful mechanics exist. It cannot prove how many shoppers converted, how large their baskets were, or that the platform caused the result.
Managed software may raise the floor by narrowing the choices. IdoSell and Shoper package hosting, storefront tooling, updates, payments, and implementation patterns into a more controlled service. That can make common UX features harder to omit. Shopify offers a managed core too, but its ecosystem encourages more theme and app variation. Open-source WooCommerce pushes even more decisions onto the merchant and developer. WooCommerce's own guidance says performance depends on themes, plugins, traffic patterns, server hardware, and the team maintaining the store. Flexibility expands the ceiling. It also expands the ways to build a poor shop.
The missing controls matter more than the brand names. The visible source does not split results by category, traffic, revenue, age, agency, customization depth, or implementation budget. The eight displayed platform groups add up to 483 stores, not the 567 named in the header, leaving 84 stores outside the visible rows. KAMAN's earlier report also says category context changes the correct benchmark. A fashion store, specialist B2B seller, and grocery retailer do not need identical product pages or checkout mechanics. Without matched cohorts, the safest conclusion is descriptive: these audited IdoSell stores were more consistently equipped, while these audited WooCommerce and Shopify stores were far more uneven.
Why it matters: Merchants often ask which platform converts best as if software arrives with a fixed conversion rate. It does not. The platform sets defaults, constraints, upgrade paths, and the amount of operational discipline required. A managed stack can reduce the cost of being competent; an open stack can produce both excellence and chaos. The practical decision is not “Who won this ranking?” It is “Which operating model will keep our team shipping the right customer-experience mechanics every quarter?”
