Accessibility Assistant vs Buy with Prime: Shopify Performance Comparison
Buy with Prime wins with Grade C vs Grade D — a one-grade performance difference that compounds on mobile devices.
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 | Accessibility Assistant | Buy with Prime | Faster |
|---|---|---|---|
| Overall Grade | D | C | Buy with Prime |
| JS Payload | 2550.61 KB | 184.43 KB | Buy with Prime |
| CPU Desktop | 33 ms | 19 ms | Buy with Prime |
| CPU Mobile | 143 ms | 121 ms | Buy with Prime |
| Layout Shift | 0.0006 | 0.0006 | Accessibility Assistant |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-30.
Buy with Prime — The Faster Option (Grade C)
Buy with Prime scores Grade C with a JS payload of 184.43 KB and 19 ms desktop CPU execution. Mobile CPU: 121 ms. Even as the faster of the two options, merchants on mobile-heavy stores should weigh its impact on their combined app stack.
View full Buy with Prime speed report →
Accessibility Assistant — The Heavier Option (Grade D)
Accessibility Assistant scores Grade D with a JS payload of 2550.61 KB and 33 ms desktop CPU execution. Mobile CPU: 143 ms. This places it in the heavier half of StackConflict’s benchmark dataset — merchants running mobile-first stores should evaluate whether the feature value justifies the performance tradeoff.
View full Accessibility Assistant speed report →
When to Choose Accessibility Assistant
- Its unique feature set has no lighter equivalent in StackConflict’s database
- Your store traffic is predominantly desktop
- You have already removed or lightened other heavy scripts to compensate
When to Choose Buy with Prime
- Its unique feature set has no lighter equivalent in StackConflict’s database
- Your store traffic is predominantly desktop
- You have already removed or lightened other heavy scripts to compensate
Performance Verdict
Winner: Buy with Prime — Buy with Prime wins with Grade C vs Grade D — a one-grade performance difference that compounds on mobile devices.
Both apps carry Grade C — see StackConflict’s full General rankings for lighter alternatives.
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.