TL;DR
The article compares 20 free or free-tier conversion rate optimization tools, each with a stated best-fit job, access model, and main limitation. "Free" covers four distinct models: public utility, verified-owner plan, limited quota, or trial — not all are unlimited. Tools evaluated include Microsoft Clarity, Hotjar, PostHog, Plausible, Matomo, Google Analytics, and VWO, each with a
Free tools are useful when they turn a conversion rate optimization question into evidence and a next action. “Free” can mean a public utility, a verified-owner plan, a limited quota, or a trial, so this comparison makes that distinction visible.
The cards below are designed for a lean team: each one states the best-fit job, the access model, the main limitation, and the point at which a paid workflow may become useful.
Quick Answer
- If you're running a lean team and need a quick, evidence-based recommendation → start with the tool whose "best-fit job" matches your specific decision, because each card states the best-fit job, access model, and main limitation to narrow your choice.
- If you're unsure whether a "free" tool will meet your needs → check the distinct access model (public utility, verified-owner plan, limited quota, or trial) listed for each tool, because the article explicitly warns "not all are unlimited" and distinguishes four free models.
- If you're evaluating session recording or heatmaps for conversion optimization → consider Microsoft Clarity or Hotjar, because they are the first two tools compared that are category-specific for conversion rate optimization with a free access model.
- If you want to validate findings against first-party data before making changes → use any tool from the comparison (e.g., Google Analytics or Matomo), because the article advises to "validate important findings against first-party data or official documentation before changing a high-value page or workflow."
How to choose a free conversion rate optimization tool
Direct answer: Start with the decision you need to make, then choose the narrowest tool that can answer it. Validate important findings against first-party data or official documentation before changing a high-value page or workflow.
Microsoft Clarity
Best for: Free heatmaps and session recordings
Completely free forever with unlimited heatmaps and recordings; no paid tier exists at all
- Access model
- Free forever, unlimited sessions, no credit card required
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Hotjar
Best for: Behavior analytics for conversion research
Legacy free Basic plan caps recordings at 35 sessions per day, sampling most site traffic
- Access model
- Free forever, up to 35 sessions/day (legacy tier)
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
PostHog
Best for: Product analytics with built-in A/B testing
Free tier includes 1 million analytics events and 5,000 session recordings monthly, one project
- Access model
- Free up to 1M events/month, no credit card
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Plausible
Best for: Lightweight traffic analytics, not testing
No permanent free plan; every signup gets a full-featured 30-day trial before billing starts
- Access model
- 30-day free trial only, no permanent free tier
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Matomo
Best for: Self-hosted analytics with heatmap add-ons
Open-source Community edition is free forever to self-host on your own server, no license fees
- Access model
- Free forever if self-hosted; cloud plans are paid
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Google Analytics
Best for: Conversion funnel and goal tracking
GA4's free tier has no hit-volume cap, only a 14-month data retention limit
- Access model
- Free forever, no meaningful usage cap
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
VWO
Best for: A/B testing and experimentation platform
Discontinued its free Starter plan in 2026; now offers only a time-limited trial before quotes
- Access model
- No permanent free tier, 30-day trial only
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Optimizely
Best for: Enterprise experimentation and feature flags
Enterprise-only platform sold via custom annual contracts; no self-serve free trial or free tier exists
- Access model
- No free tier, sales-gated demo only
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Convert
Best for: Privacy-focused A/B testing
No permanent free plan; offers a 15-day full-feature trial with no credit card required upfront
- Access model
- 15-day free trial only, no free tier
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
AB Tasty
Best for: Experimentation and personalization for enterprise
No self-serve free trial; only a short proof-of-concept period arranged through a sales conversation
- Access model
- No free tier, PoC via sales only
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Crazy Egg
Best for: Heatmaps and A/B testing for marketers
No permanent free plan; every paid tier is preceded by a 30-day trial, no card needed
- Access model
- 30-day free trial only, no free tier
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
FullStory
Best for: Session replay for digital experience analysis
Free tier allows 30,000 sessions per month with one year of replay and analytics retention
- Access model
- Free up to 30,000 sessions/month
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Mouseflow
Best for: Session recordings and funnel analysis
"Free Forever" plan caps at 500 recorded sessions per month for a single website project
- Access model
- Free forever, up to 500 sessions/month
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Lucky Orange
Best for: Heatmaps, recordings, and live chat
Free plan tracks up to 100 monthly sessions with 30 days of data storage included
- Access model
- Free forever, up to 100 sessions/month
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Heap
Best for: Autocapture analytics for conversion funnels
Free tier supports up to 10,000 monthly sessions with six months of data history
- Access model
- Free up to 10,000 sessions/month
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Mixpanel
Best for: Event-based conversion funnel analytics
Free plan covers up to 1 million analytics events monthly with unlimited team seats
- Access model
- Free up to 1M events/month, unlimited seats
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Fathom Analytics
Best for: Privacy-first traffic measurement
No ongoing free plan; pricing is pageview-based after a 7-day trial with no card required
- Access model
- No free tier, 7-day free trial only
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
GrowthBook
Best for: Open-source feature flagging and experimentation
Open-source core is free to self-host forever with unlimited users; only infrastructure costs apply
- Access model
- Free forever, self-hosted, unlimited users (MIT license)
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Unbounce
Best for: Landing pages built for conversion testing
No free plan at any tier; a 14-day trial precedes paid plans starting near $99/month
- Access model
- No free tier, 14-day free trial only
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
Thrive Optimize
Best for: WordPress-native A/B testing plugin
Sold only inside the paid Thrive Suite bundle; no standalone purchase, trial, or free tier
- Access model
- No free tier; requires Thrive Suite membership
- Research check
- Official product source linked
- Evaluate next
- Category fit, limits, integrations, and governance
A practical conversion rate optimization workflow
- Define one business question and the evidence that would change your decision.
- Run the smallest free check that can answer that question.
- Record the source URL, access model, date checked, and material limitation.
- Validate important findings with a second source before implementation.
- Prioritize changes by business impact, not by the number of warnings.
Category research: we screened relevant software-directory categories on G2, used Product Hunt to surface newer products, and then linked each card to the product’s official source. BuiltWith is used only where technology-stack signals are relevant, such as competitive intelligence and prospecting. Listings are not paid placements, and inclusion is not an endorsement.
Research methodology
Direct answer: This comparison groups tools by use case and links each card to an official product or documentation page. We distinguish free public utilities, free tiers, verification-gated access, and trials. The order reflects practical usefulness for a lean team: evidence quality, access friction, relevance to conversion rate optimization, clarity of limits, and how easily a result becomes a next action.
We do not treat an automated score as a guarantee of traffic, conversions, rankings, or AI citations. Product names, quotas, pricing, and capabilities change, so recheck the official source before relying on a current limit or making a purchase decision. Research checked August 2, 2026.
Frequently asked questions
Are these conversion rate optimization tools completely free?
Not always. This list includes public utilities, free plans, limited quotas, verification-gated access, and trials. Check the official source linked on each card for current access terms.
Is a free conversion rate optimization tool enough for a small team?
Often, yes for a focused first workflow or a small data set. Teams usually need a paid plan when they require larger limits, history, automation, permissions, exports, or support.
How should I compare two conversion rate optimization tools?
Compare the job each tool performs, the evidence it produces, the data it can export, its integrations, privacy terms, and the limit that will matter first—not only the headline feature list.
What should I verify before adopting one?
Confirm the current pricing page, quota, retention policy, security terms, cancellation process, and whether the free tier permits the workflow you intend to run. Validate important outputs before using them for a high-impact decision.
Conclusion
Direct answer: The best free conversion rate optimization stack is small and explicit. Pick tools based on the question at hand, preserve the evidence trail, and upgrade only when scale, history, automation, or collaboration justifies the additional cost.
Most conversion rate optimization work eventually comes back to one page: the one traffic actually lands on. If that page itself needs work before you can meaningfully test it, these landing page tools cover the build side of the same problem.
