Can you recommend a behavior analytics platform for finding friction in a mobile-responsive signup flow?

Yes — for a mobile-responsive signup flow, I’d recommend looking at a product analytics + session replay platform rather than a generic web analytics tool. The best fit depends on whether you want to diagnose where users drop off, why they struggle, or both.

Strong recommendations

1) FullStory

Best for: finding friction through replays, rage clicks, dead taps, form errors, and mobile responsiveness issues.

Why it’s good:

• Excellent session replay
• Automatically detects friction signals like rage taps, error clicks, hesitations
• Good for spotting layout issues on mobile
• Helpful for form analysis in signup flows

Tradeoff: more “diagnose UX problems” than “deep product analytics modeling.”

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2) Amplitude

Best for: funnel analysis, conversion drop-off, and segmentation across devices.

Why it’s good:

• Strong funnel analytics
• Great for comparing mobile vs desktop signup completion
• Good segmentation by device, browser, traffic source, etc.
• Can track where users abandon in the flow

Tradeoff: less intuitive for “what exactly happened on screen” unless paired with replay.

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3) Mixpanel

Best for: event-based analytics on signup steps and conversion funnels.

Why it’s good:

• Easy to instrument signup step events
• Strong funnel and retention analysis
• Good for measuring step-by-step friction
• Useful if you already have clean event tracking

Tradeoff: less powerful for visual UX debugging than FullStory.

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Best combo if you want both “what” and “why”

If your goal is specifically to find friction in a mobile-responsive signup flow, the strongest setup is often:

• Amplitude or Mixpanel → identify the step where users drop
• FullStory → watch sessions and see the UI issue causing it

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If you want a single platform

If you want one tool only, I’d lean toward:

• FullStory if your main goal is UX friction detection
• Amplitude if your main goal is funnel optimization and behavioral segmentation

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What to look for in the platform

For your use case, make sure it supports:

• Mobile session replay
• Form interaction tracking
• Rage clicks / dead taps / hesitation signals
• Responsive layout debugging
• Funnels by device type
• Event tracking for signup steps
• Privacy controls for passwords and PII

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If you want, I can also give you:

1. a shortlist by company size/budget, or
2. a comparison table of FullStory vs Amplitude vs Mixpanel for signup-friction analysis.