Heap vs Meta Conversions API (CAPI) Param Builder: Shopify Performance Comparison
Both apps score Grade B — Meta Conversions API (CAPI) Param Builder has the edge with 9 ms vs 22 ms desktop CPU execution.
Both apps provide heatmaps, session recording, and analytics 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 | Heap | Meta Conversions API (CAPI) Param Builder | Faster |
|---|---|---|---|
| Overall Grade | B | B | Tie |
| JS Payload | 135.82 KB | 54.69 KB | Meta Conversions API (CAPI) Param Builder |
| CPU Desktop | 22 ms | 9 ms | Meta Conversions API (CAPI) Param Builder |
| CPU Mobile | 106 ms | 37 ms | Meta Conversions API (CAPI) Param Builder |
| Layout Shift | 0.0 | 0.0 | Heap |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-31.
Meta Conversions API (CAPI) Param Builder — The Faster Option (Grade B)
Meta Conversions API (CAPI) Param Builder scores Grade B with a JS payload of 54.69 KB and 9 ms desktop CPU execution. Mobile CPU: 37 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 Meta Conversions API (CAPI) Param Builder speed report →
Heap — The Heavier Option (Grade B)
Heap scores Grade B with a JS payload of 135.82 KB and 22 ms desktop CPU execution. Mobile CPU: 106 ms. Performance is acceptable but worth monitoring, particularly on stores with high mobile traffic share.
When to Choose Heap
- 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 Meta Conversions API (CAPI) Param Builder
- 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 — Meta Conversions API (CAPI) Param Builder has the edge with 9 ms vs 22 ms desktop CPU execution.
Install Meta Conversions API (CAPI) Param Builder →
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 2026-05-31.