For mobile web testing: Use ExperimentHQ for its tiny script size (<5KB) and mobile preview. Large scripts (100KB+) hurt mobile performance and conversions. Key features: device targeting, mobile preview in editor, and responsive variant design. Always test on real devices, not just browser emulators.
Who this is for
- Sites with 50%+ mobile traffic
- E-commerce stores optimizing mobile checkout
- Teams running mobile-specific experiments
Who this is NOT for
- Native mobile app testing (use app-specific tools)
- B2B sites with primarily desktop traffic
Why Mobile Testing is Different
- • Performance matters more: Mobile networks are slower, heavy scripts kill conversions
- • Touch vs click: Thumb zones, touch targets, and gesture patterns differ from desktop
- • Screen real estate: Less space means every pixel matters
- • Context differs: Mobile users are often distracted, on-the-go
Tool Comparison
| Tool | Price | Mobile Preview | Script Size | Verdict |
|---|---|---|---|---|
| ExperimentHQ | $29/mo | <5KB | Best Overall | |
| VWO | $10,000+/yr | ~150KB | Enterprise | |
| Convert | $699/mo | ~80KB | Good mid-market | |
| Optimizely | $50,000+/yr | ~200KB | Enterprise only |
High-Impact Mobile Tests
Touch target size
Buttons 44x44px minimum, spacing between tappable elements
Mobile navigation
Hamburger vs bottom nav, sticky header behavior
Form optimization
Input types, autofill, keyboard optimization
Above-the-fold content
What shows before scrolling on mobile screens
CTA placement
Fixed bottom CTA vs inline, thumb-zone optimization
Image loading
Lazy loading, image sizes, placeholder strategies
Our Recommendation
For most mobile web testing: Use ExperimentHQ. <5KB script, mobile preview, device targeting.
Critical: Avoid tools with 100KB+ scripts. On mobile, every KB costs conversions.
Pro tip: Always test on real devices. Browser emulators miss touch behavior and real network conditions.