Upsellit vs Zipify OCO: Shopify Performance Comparison
Both apps score Grade B — Zipify OCO has the edge with 3 ms vs 10 ms desktop CPU execution.
Both apps provide post-purchase upsell and cross-sell 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 | Upsellit | Zipify OCO | Faster |
|---|---|---|---|
| Overall Grade | B | B | Tie |
| JS Payload | 32.0 KB | 104.22 KB | Upsellit |
| CPU Desktop | 10 ms | 3 ms | Zipify OCO |
| CPU Mobile | 27 ms | 8 ms | Zipify OCO |
| Layout Shift | 0.0 | 0.0 | Upsellit |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-30.
Zipify OCO — The Faster Option (Grade B)
Zipify OCO scores Grade B with a JS payload of 104.22 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 Zipify OCO speed report →
Upsellit — The Heavier Option (Grade B)
Upsellit scores Grade B with a JS payload of 32.0 KB and 10 ms desktop CPU execution. Mobile CPU: 27 ms. Performance is acceptable but worth monitoring, particularly on stores with high mobile traffic share.
View full Upsellit speed report →
When to Choose Upsellit
- 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 Zipify OCO
- 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 — Zipify OCO has the edge with 3 ms vs 10 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.