Fera Proof vs Stamped NPS: Shopify Performance Comparison
⏳ Data pending for Fera Proof — our scanner captured only the async loader stub for this app. Full bundle metrics are being collected from live Shopify storefronts. Once available, this page will show a complete head-to-head comparison.
Both Fera Proof and Stamped NPS provide social proof and FOMO notifications functionality for Shopify stores.
What We Know: Stamped NPS (Benchmarked)
Stamped NPS has been measured in StackConflict’s clean-room lab:
| Metric | Stamped NPS |
|---|---|
| Overall Grade | B |
| JS Payload | 107.0 KB |
| CPU Desktop | 10 ms |
| CPU Mobile | 39 ms (0.0s) |
| Layout Shift | 0.0 |
Grade B means Stamped NPS passes every StackConflict threshold — safe to install on any storefront including mobile-first stores.
View full Stamped NPS speed report →
Pending: Fera Proof
StackConflict’s scanner detected that Fera Proof uses an async JavaScript loader — a small stub that only initialises its full bundle on a real, authenticated Shopify storefront. This means our lab environment captured the tiny stub file only, not the production bundle that actually runs on live stores.
We are collecting real bundle data by scanning public Shopify storefronts. Once captured, the head-to-head metrics for Fera Proof will appear here automatically.
View Fera Proof on Shopify App Store →
About This Test
StackConflict measures each Shopify app in an isolated clean-room environment — a Playwright-controlled browser with no other scripts installed. V8 CPU cost is the ScriptDuration delta measured before and after bundle injection. Mobile CPU applies the standard 4× Lighthouse slowdown factor.
Stamped NPS data from the StackConflict Lab (2026-05-30). Fera Proof data pending.