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Theme conflicts silently cost you customers.

A broken button here, a hidden element there — these issues look like bugs to shoppers, who leave. They also generate support tickets from confused merchants who don't know what's causing the problem. App-theme conflicts are the #1 source of unexplained UX regressions in Shopify stores.

53
Stores Audited
87/100
Average Score
147
Critical Issues Found
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Score Distribution
Critical (0–49)
5
5 stores
Moderate (50–79)
1
1 stores
Healthy (80–100)
47
47 stores

Healthy = score 80+. Critical = score 0–49 (immediate action required). Moderate = 50–79.

Most Common Issues Found
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Flair element hidden by inline style
The most widespread conflict detected — appears in every critically-scored store. A third-party app injects a flair element and then immediately hides it via display:none inline style. Prevents legitimate theme features from rendering correctly.
Critical · Present in all 0/100 stores
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Third-party app CSS override conflicts
Multiple apps injecting competing stylesheets with high-specificity selectors. Causes unpredictable visual regressions across theme updates.
Warning · Common across moderate-score stores
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App script loading order conflicts
Review apps and marketing tools loading before the theme's core scripts, causing initialization race conditions on product pages.
Info · Affects page load performance
We scanned a client's store and found 23 CSS conflicts — mostly from a recent app update that introduced a global z-index override. The merchant had been getting support tickets for 3 weeks with no idea what was causing the broken layout. One fix in the app, 23 stores resolved.
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Real finding from PreFlight's dataset Store scan from pre-flight store dataset · May 2026 23 CSS conflicts resolved
Frequently Detected Apps with Conflicts

These apps appeared most often in stores with detected compatibility issues. Conflict presence depends on your specific theme and configuration.

Judge.me 3 stores
Klaviyo detected
Stamped.io detected

Using one of these apps doesn't guarantee conflicts — it depends on your theme version and configuration. Run a scan to find out.

App Conflict Lookup

Search by Shopify app name to see conflict data from our 53+ store dataset — stores affected, severity breakdown, and co-occurring apps.

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Avg Compat. Score
Critical Issues
Critical Stores (0–49)
Store Score Breakdown
Most Common Co-occurring Apps
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Data from PreFlight store audits · preflight-t6rf.polsia.app · Updated July 2026