ShopWeight

Fastest Shopify personalization and recommendation apps, ranked on live stores

We ranked 5 personalization and recommendation apps by the processing time each added to the homepages of real Shopify ecommerce stores. The lightest are at the top.

What counts here: Changes products, content or offers for each shopper, including product recommendations.

The most recent check in the index ran on September 26, 2026.

All apps in the index · How we measure these numbers

ShopWeight isn't affiliated with Shopify or with any app maker listed here.

Popular apps and the processing time they add

Among this category's apps that are light or moderate on the typical store, UpSellit is found on the most stores.

LightModerateHeavyVery heavy Fewer stores, lighterMore stores, lighterFewer stores, heavierMore stores, heavier Rebuy: heavy on the typical store, found on 135 storesRebuyUpSellit: light on the typical store, found on 30 storesUpSellitBlack Crow: light on the typical store, found on 30 storesBlack CrowNosto: light on the typical store, found on 30 storesNostoOctane AI: moderate on the typical store, found on 21 storesOctane AI Typical processing time Stores measured

The vertical dashed line is at 30 stores: about half of this category's apps were found on more stores and half on fewer. The horizontal dashed line is where moderate ends and heavy begins.

RankAppTypical processing timeStores measured
1 UpSellit Light (under 100 ms) 30
2 Black Crow Light (under 100 ms) 30
3 Nosto Light (under 100 ms) 30
4 Octane AI Moderate (100 to 300 ms) 21
5 Rebuy Heavy (300 ms to 1 second) 135

Apps in the same band are close. Their order within a band can change as more stores are checked. The bar under each band shows how the app varied from store to store. Apps found on fewer than 20 stores aren't listed yet. The list grows as more stores are checked.

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