2 Visions launches free tool to show which Shopify apps slow stores

2 Visions on Tuesday launched ShopWeight, a free tool that measures how much Shopify apps slow storefronts and ranks them by processing weight. The company also released a public App Weight Index based on 116 apps measured across more than 600 stores, with Google tag, Meta Pixel and Klaviyo among the heaviest apps most commonly found.

Why it matters: - Shopify store owners often add apps one by one without seeing the total performance cost. - ShopWeight gives teams a way to identify which apps add the most processing time on a homepage. - The tool is meant to help merchants improve user experience through removals, swaps or configuration changes.

What happened: - 2 Visions launched ShopWeight, a free tool that scans a Shopify store homepage and ranks the apps it finds by weight. - The company also published the ShopWeight App Weight Index, a public ranking of common Shopify apps by the processing time they add. - The release says the index is based on 116 apps measured across more than 600 Shopify stores. - The three apps found most often were the Google tag, Meta Pixel and Klaviyo.

The details: - ShopWeight loads a store homepage five times in Google's Lighthouse using settings that mimic a mid-range phone on a mobile connection. - The tool matches scripts on the page to the apps that loaded them. - ShopWeight places each app into four bands: light under 100 ms, moderate from 100 to 300 ms, heavy from 300 ms to 1 second, and very heavy above 1 second. - The tool does not install anything on the store and does not change the storefront. - ShopWeight also shows Google Chrome UX Report speed figures when those are available for the store. - The index includes a page for each app, category pages for apps that do the same job, and head-to-head comparisons such as Klaviyo vs. Postscript. - A free speed review guide compares ShopWeight with Shopify's own speed report, Google Search Console, PageSpeed Insights and WebPageTest. - ShopWeight appears in the index only after it has been measured on at least 20 stores. - Stores are never named in the index. - App makers can email shopweight@2visions.com if they believe a result is wrong. - 2 Visions says it replies within five business days, rechecks the app and then corrects the page or publishes the maker's reply beside it. - The company says an app's weight can vary depending on how it is set up. - The release says the Google tag appeared on 547 of 605 stores, Meta Pixel on 509 and Klaviyo on 496. - The release says the Google tag was heavy on 75% of the stores it was measured on, while Meta Pixel was heavy on 70%. - The release says the three most common apps each added 300 milliseconds to 1 second of processing time on a typical store homepage.

Between the lines: - The launch turns a technical performance issue into a merchant-friendly scorecard. - The public index may also put pressure on app makers to optimize how their products affect storefront speed. - Jarvis said the goal is to show teams what each app costs in processing time so they can weigh that against the value it delivers. - Jarvis also said some heavy apps still matter because they handle essential tasks such as fraud prevention and customer retention.

What's next: - Store owners, developers and agencies can check any Shopify store for free with ShopWeight. - 2 Visions says the index will continue to expand as more apps clear the 20-store measurement threshold. - App makers who dispute results can submit a review request for a remeasurement.

The bottom line: - ShopWeight gives Shopify merchants a free way to see which apps are slowing their store and by how much, without changing the store itself.