FullStory vs Microsoft Clarity: Shopify Performance Comparison
Microsoft Clarity wins with Grade B vs Grade C — a one-grade performance difference that compounds on mobile devices.
Both apps provide heatmaps, session recording, and analytics 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 | FullStory | Microsoft Clarity | Faster |
|---|---|---|---|
| Overall Grade | C | B | Microsoft Clarity |
| JS Payload | 297.02 KB | 60.93 KB | Microsoft Clarity |
| CPU Desktop | 24 ms | 8 ms | Microsoft Clarity |
| CPU Mobile | 84 ms | 20 ms | Microsoft Clarity |
| Layout Shift | 0.0 | 0.0 | FullStory |
Mobile CPU measured with 4× CDP throttle (mid-range Android). Tested 2026-05-30.
Microsoft Clarity — The Faster Option (Grade B)
Microsoft Clarity scores Grade B with a JS payload of 60.93 KB and 8 ms desktop CPU execution. Mobile CPU: 20 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 Microsoft Clarity speed report →
FullStory — The Heavier Option (Grade C)
FullStory scores Grade C with a JS payload of 297.02 KB and 24 ms desktop CPU execution. Mobile CPU: 84 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 FullStory speed report →
When to Choose FullStory
- 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 Microsoft Clarity
- 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: Microsoft Clarity — Microsoft Clarity 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.