Monster Upsells vs Purple Dot: Shopify Performance Comparison
Both apps score Grade C — Purple Dot has the edge with 8 ms vs 17 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 | Monster Upsells | Purple Dot | Faster |
|---|---|---|---|
| Overall Grade | C | C | Tie |
| JS Payload | 214.5 KB | 255.99 KB | Monster Upsells |
| CPU Desktop | 17 ms | 8 ms | Purple Dot |
| CPU Mobile | 76 ms | 92 ms | Monster Upsells |
| Layout Shift | 0.0 | 0.0006 | Monster Upsells |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-30.
Purple Dot — The Faster Option (Grade C)
Purple Dot scores Grade C with a JS payload of 255.99 KB and 8 ms desktop CPU execution. Mobile CPU: 92 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 Purple Dot speed report →
Monster Upsells — The Heavier Option (Grade C)
Monster Upsells scores Grade C with a JS payload of 214.5 KB and 17 ms desktop CPU execution. Mobile CPU: 76 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 Monster Upsells speed report →
When to Choose Monster Upsells
- 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 Purple Dot
- 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
Result: Comparable — Both apps score Grade C — Purple Dot has the edge with 8 ms vs 17 ms desktop CPU execution.
Both apps carry Grade C — see StackConflict’s full Upsell 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.