Back In Stock vs UserWay Accessibility Widget: Shopify Performance Comparison
Both apps score Grade B — UserWay Accessibility Widget has the edge with 12 ms vs 36 ms desktop CPU execution.
Both apps provide general Shopify store enhancement functionality for Shopify stores. This page presents StackConflict’s independent lab results for both — measured in a clean-room environment with no other apps installed.
Head-to-Head Metrics
| Metric | Back In Stock | UserWay Accessibility Widget | Faster |
|---|---|---|---|
| Overall Grade | B | B | Tie |
| JS Payload | 132.07 KB | 112.17 KB | UserWay Accessibility Widget |
| CPU Desktop | 36 ms | 12 ms | UserWay Accessibility Widget |
| CPU Mobile | 60 ms | 83 ms | Back In Stock |
| Layout Shift | 0.0 | 0.0 | Back In Stock |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-30.
UserWay Accessibility Widget — The Faster Option (Grade B)
UserWay Accessibility Widget scores Grade B with a JS payload of 112.17 KB and 12 ms desktop CPU execution. Mobile CPU: 83 ms. It passes every StackConflict threshold for payload, CPU, and layout stability — making it safe to install on any storefront including mobile-first stores where Time-to-Interactive directly impacts conversion.
View full UserWay Accessibility Widget speed report →
Back In Stock — The Heavier Option (Grade B)
Back In Stock scores Grade B with a JS payload of 132.07 KB and 36 ms desktop CPU execution. Mobile CPU: 60 ms. Performance is acceptable but worth monitoring, particularly on stores with high mobile traffic share.
View full Back In Stock speed report →
When to Choose Back In Stock
- You need its specific features and can monitor its mobile impact
- Your other apps are lightweight (Grade A) so there is headroom
- You are on desktop-skewed traffic where CPU cost matters less
When to Choose UserWay Accessibility Widget
- You need its specific features and can monitor its mobile impact
- Your other apps are lightweight (Grade A) so there is headroom
- You are on desktop-skewed traffic where CPU cost matters less
Performance Verdict
Result: Comparable — Both apps score Grade B — UserWay Accessibility Widget has the edge with 12 ms vs 36 ms desktop CPU execution.
Install UserWay Accessibility Widget →
About This Test
StackConflict measures each Shopify app in an isolated clean-room environment — a single development store, no other scripts, Playwright-controlled browser. V8 CPU cost is the ScriptDuration delta before and after injection. CLS is captured from the same browser session. Results represent the median of three independent runs with outliers removed.
Data from the StackConflict Lab. Last updated 2026-05-30.