FullSession vs. Hotjar Heatmaps: Which Wins for SaaS? ...
Heatmaps for Conversion: From Insight to A/B Test Wins
By Roman Mohren • Last updated: Nov 2025
BLUF: Teams that pair interactive heatmaps with funnel context and quick validation tests ship fixes faster and see directional gains in form completion and checkout conversion. Updated: Nov 2025.
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Problem signals: where conversion leaks start
Heatmaps show where attention concentrates—and where it goes to die. The most common conversion leaks your team will see:
- High attention, low advance: Tap/click clusters form around secondary actions (e.g., coupon, learn more), starving the primary path.
- Mobile below-fold CTAs: Scroll-depth and fold lines reveal that the primary CTA sits just out of view on common viewports.
- Rage/“dead” taps: Users hammer a disabled button or interact with an element that looks actionable but isn’t.
- Hover-heavy experiences: Desktop designs rely on hover hints that don’t translate to mobile, creating comprehension gaps.
- Variant “no-result” mirages: An A/B test looks neutral, while heatmaps expose intent siphons and validation hiccups.
Root-cause map: from signal → cause → action
- Signal: Rage taps / dead taps near a primary CTA
Likely causes: Disabled state awaiting validation; hitbox too small; off-screen focus/scroll.
Action: Enlarge target; add visible loading/validation states; ensure scroll-into-view on submit. - Signal: Tap/click clusters on secondary link (coupon, learn more)
Likely causes: Misprioritized hierarchy; distracting offer placement.
Action: Demote secondary element; add inline guardrails (e.g., collapsible coupon); elevate primary CTA. - Signal: Below-fold CTA on mobile
Likely causes: Responsive layout pushes primary action under order summary or long copy.
Action: Move CTA above fold for small breakpoints; reduce vertical padding/margins. - Signal: High attention without comprehension (desktop-biased UI)
Likely causes: Hover-dependence; tooltips as the only instruction.
Action: Replace hover tips with inline helper text on mobile; increase contrast and affordances. - Signal: Neutral/mixed A/B result
Likely causes: Unbalanced device outcomes; friction localized to one step.
Action: Segment heatmaps by device and step; rescue the winner by fixing the hotspot, then re-measure.
How to fix it in 3 steps (deep-dive: Interactive Heatmaps)
Step 1 — Create conversion views (15 min)
Set Saved Views for: Pricing/Plan, Sign-up/Billing, Cart/Shipping/Payment, and Confirm/Thank-you. Enable overlays: rage taps, dead taps, fold line, device/viewport filters, and element stats (tap-through, retries).
Step 2 — Tie “where” to “how much” with Funnels (10 min)
For any hotspot, open Funnels to the adjacent step and quantify drop-off deltas. Tag each issue with Impact (H/M/L) and Effort (H/M/L); schedule H/L items first (copy/layout/hitbox) before component refactors.
Step 3 — Validate in 24–72 hours (15–30 min)
Ship micro-tweaks behind flags. Compare predicted p50 completion to observed p50; spot-check a handful of sessions (optional replay) to ensure the heatmap has cooled and the funnel tightened.
Early product interlinks:
Case snippet
A subscription SaaS team saw flat desktop conversion but a slide on mobile. Heatmaps showed dense tap clusters on a collapsed coupon section and a below-fold purchase CTA. Funnels confirmed a disproportionate drop between Plan → Billing. The team demoted the coupon, moved the primary CTA above the fold for ≤700px viewports, and added a visible loading/validation state on submit. Within 48 hours, the mobile heatmap cooled, retries fell, and the observed p50 completion ticked upward directionally. Because input masking stayed on, no sensitive data was captured—only the interaction patterns and DOM states needed to confirm the fix. The same playbook later rescued a neutral A/B test on pricing by removing a “learn more” siphon that was attracting clicks without advancing the flow.
Next steps
- Pin Saved Views for your top conversion steps (pricing/sign-up/cart/checkout).
- Review mobile-first heatmaps; elevate primary actions above the fold.
- Use Funnels to quantify impact; ship H/L fixes within 72 hours.
- Validate, document, and template—convert findings into your A/B test backlog.
Conversion Triage via Heatmaps (Updated Nov 2025)
| Signal | Likely cause | Heatmap check | Funnel step to watch | Recommended fix | Updated |
|---|---|---|---|---|---|
| Rage taps on primary CTA | Disabled/validation | Rage & dead taps; retries | Step before submit | Visible loading; scroll-into-view | Nov 2025 |
| Secondary siphon (coupon/learn more) | Misprioritized hierarchy | Hotspots off primary path | Step after hotspot | Demote/accordion; elevate primary | Nov 2025 |
| CTA below mobile fold | Layout & spacing | Fold line; shallow depth | Current step conversion | Move CTA above fold; tighten layout | Nov 2025 |
| Hover-only guidance | Mobile comprehension gap | Low advance post-attention | Same step | Inline helper text on mobile | Nov 2025 |
Rage taps on primary CTA
Secondary siphon
CTA below mobile fold
Hover-only guidance
FAQs
- How are heatmaps different from traditional analytics for conversion work?
- Heatmaps reveal where attention concentrates; when paired with Funnels, you see how much it costs in drop-offs—so you can prioritize fixes by impact.
- Do I need session replay to use heatmaps effectively?
- Replay is optional; it helps confirm why (validation timing, API errors). Start with heatmaps + funnels; escalate to replay when a fix needs visual evidence.
- Will heatmaps slow my site or app?
- FullSession capture is streamed/batched and designed to minimize overhead. Keep masking defaults to reduce payload.
- What are high-leverage fixes we can test first?
- Move CTAs above fold (mobile), demote distracting secondaries, enlarge tap targets, and add visible loading/validation states.
- How do we integrate heatmaps with A/B testing?
- Use heatmaps to triage neutral tests: find hotspots, fix friction, then re-measure. Promote winners after the heatmap cools and the funnel improves.
- How should we handle privacy?
- Inputs are masked by default. Only allow-list non-sensitive fields when strictly necessary and document the rationale.
- Does this work for SPAs and modern frameworks?
- Yes. Ensure route changes and virtual-DOM mutations are tracked; then segment by device and viewport in your views.