Skio vs Subify: Shopify Performance Comparison
Subify wins with Grade B vs Grade C — a one-grade performance difference that compounds on mobile devices.
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 | Skio | Subify | Faster |
|---|---|---|---|
| Overall Grade | C | B | Subify |
| JS Payload | 150.62 KB | 140.75 KB | Subify |
| CPU Desktop | 33 ms | 31 ms | Subify |
| CPU Mobile est. | ~132 ms | 148 ms | Skio |
| Layout Shift | 0.0 | 0.0 | Skio |
Mobile CPU applies the 4× Lighthouse throttle for mid-range Android. Tested 2026-05-30.
Subify — The Faster 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. 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 Subify speed report →
Skio — The Heavier Option (Grade C)
Skio scores Grade C with a JS payload of 150.62 KB and 33 ms desktop CPU execution. Mobile estimated cost: ~132 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.
When to Choose Skio
- 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 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
Winner: Subify — Subify wins with Grade B vs Grade C — a one-grade performance difference that compounds on mobile devices.
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.