Loop Subscriptions vs Subify: Shopify Performance Comparison
Both apps score Grade B — Loop Subscriptions has the edge with 3 ms vs 31 ms desktop CPU execution.
Both apps provide subscription billing and recurring orders 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 | Loop Subscriptions | Subify | Faster |
|---|---|---|---|
| Overall Grade | B | B | Tie |
| JS Payload | 113.8 KB | 140.75 KB | Loop Subscriptions |
| CPU Desktop | 3 ms | 31 ms | Loop Subscriptions |
| CPU Mobile | 8 ms | 148 ms | Loop Subscriptions |
| Layout Shift | 0.0 | 0.0 | Loop Subscriptions |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-30.
Loop Subscriptions — The Faster Option (Grade B)
Loop Subscriptions scores Grade B with a JS payload of 113.8 KB and 3 ms desktop CPU execution. Mobile CPU: 8 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 Loop Subscriptions speed report →
Subify — The Heavier Option (Grade B)
Subify scores Grade B with a JS payload of 140.75 KB and 31 ms desktop CPU execution. Mobile CPU: 148 ms. Performance is acceptable but worth monitoring, particularly on stores with high mobile traffic share.
View full Subify speed report →
When to Choose Loop Subscriptions
- 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 Subify
- 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 — Loop Subscriptions has the edge with 3 ms vs 31 ms desktop CPU execution.
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.