Kiwi Sizing vs Popcustoms: Shopify Performance Comparison
⏳ Data pending for Popcustoms — our scanner captured only the async loader stub for this app. Full bundle metrics are being collected from live Shopify storefronts. Once available, this page will show a complete head-to-head comparison.
Both Kiwi Sizing and Popcustoms provide personalization and product recommendations functionality for Shopify stores.
What We Know: Kiwi Sizing (Benchmarked)
Kiwi Sizing has been measured in StackConflict’s clean-room lab:
| Metric | Kiwi Sizing |
|---|---|
| Overall Grade | D |
| JS Payload | 521.05 KB |
| CPU Desktop | 70 ms |
| CPU Mobile | 331 ms (0.3s) |
| Layout Shift | 0.0 |
Grade D indicates Kiwi Sizing carries a significant JavaScript footprint. Check the full report for lighter alternatives in this category.
View full Kiwi Sizing speed report →
Pending: Popcustoms
StackConflict’s scanner detected that Popcustoms uses an async JavaScript loader — a small stub that only initialises its full bundle on a real, authenticated Shopify storefront. This means our lab environment captured the tiny stub file only, not the production bundle that actually runs on live stores.
We are collecting real bundle data by scanning public Shopify storefronts. Once captured, the head-to-head metrics for Popcustoms will appear here automatically.
View Popcustoms on Shopify App Store →
About This Test
StackConflict measures each Shopify app in an isolated clean-room environment — a Playwright-controlled browser with no other scripts installed. V8 CPU cost is the ScriptDuration delta measured before and after bundle injection. Mobile CPU applies the standard 4× Lighthouse slowdown factor.
Kiwi Sizing data from the StackConflict Lab (2026-05-31). Popcustoms data pending.