How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- VWO is the best all in one testing platform for most teams: A/B testing, heatmaps, recordings, and personalisation in one suite, sold by quote.
- Microsoft Clarity is the essential free starting point: unlimited heatmaps and session recordings with no traffic caps and no paid tier.
- Convert is the testing specialist: privacy focused A/B testing from 299 dollars a month billed annually, with no behaviour analytics bundled in.
- No tool guarantees conversions: tools supply evidence and experiments, and your traffic volume decides whether test results mean anything at all.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 VWO | All in one testing suite | See website | Yes |
 Optimizely | Enterprise experimentation | See website | No |
 AB Tasty | Testing plus personalisation | See website | No |
 Convert | Privacy focused A/B testing | $299 per month | No |
 Hotjar | Surveys with heatmaps | Free | Yes |
 Microsoft Clarity | Free behaviour analytics | Free | Yes |
 Crazy Egg | Simple heatmaps | $29 per month | No |
 Mouseflow | Session replay on a budget | $25 per month | Yes |
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#1VWO
Best for: All in one testing suite4.4/5 on
G2 (929 reviews, checked Oct 2026)
Visit vwo.com
Starting priceSee website
Free planYes
What we like- VWO is the most complete mid market CRO suite: A/B and multivariate testing, a visual editor for marketers, heatmaps, session recordings, surveys, and personalisation under one login, with a free Explore tier for behaviour basics. It suits teams that want one vendor and one tag rather than a patchwork. VWO and AB Tasty now sit under the same Wingify ownership, which is consolidating the testing market around this platform.
Watch out for- Paid plans are quote based, and the suite's breadth means real money at meaningful traffic levels, so budget conversations start with sales. Doing everything in one platform also means each module can trail the best specialist: its analytics will not replace GA4. Low traffic sites will pay for testing capacity they cannot statistically use.
Starting priceSee website
Free planNo
What we like- Optimizely is the enterprise experimentation platform: server side and client side testing, feature flags, strong statistics controls, and the governance large organisations need to run hundreds of experiments without collisions. Its results tooling is built for programmes with dedicated experimentation teams and engineering support. For companies where testing is an operating discipline, it remains the reference product.
Watch out for- Pricing is fully custom packaged and sits at the top of this market
- Published estimates place it far beyond small business budgets. The platform's power assumes engineers and analysts on staff, and marketing led teams often use a fraction of it. Implementation quality decides everything, and poor tagging quietly invalidates results.
#3AB Tasty
Best for: Testing plus personalisation4.4/5 on
G2 (422 reviews, checked Oct 2026)
Visit abtasty.com
Starting priceSee website
Free planNo
What we like- AB Tasty pairs A/B testing with personalisation and audience segmentation aimed at marketing teams, with a visual editor, ready made widgets for urgency and social proof style messages, and hands on vendor support that 2026 comparisons single out. European brands often favour it for its privacy posture and local support. It now shares Wingify ownership with VWO, though the products are still sold and run separately.
Watch out for- Pricing is quote only, positioned at mid market and enterprise level. There is no free tier, and evaluation runs through a proof of concept rather than self serve signup. As with its new sibling VWO, examine the product roadmap during procurement, since ownership consolidation can shift priorities.
#4Convert
Best for: Privacy focused A/B testing4.6/5 on
G2 (98 reviews, checked Oct 2026)
Visit convert.com
Starting price$299 per month
Free planNo
What we like- Convert does one job, A/B testing, and does it with a privacy first design: no data selling, strong consent handling, and flicker free test delivery that agencies and European brands value. Published pricing starts at 299 dollars a month billed annually for 100,000 tested users a month, unusually transparent for this category. Unlimited sub accounts on agency plans make it a favourite of CRO agencies running client programmes.
Watch out for- Testing is all it does: heatmaps, recordings, and surveys require separate tools beside it. The entry price buys serious capacity that low traffic sites cannot use statistically. Its editor and integrations are solid rather than flashy, which suits practitioners and disappoints demo driven buyers.
#5Hotjar
Best for: Surveys with heatmaps4.3/5 on
G2 (345 reviews, checked Oct 2026)
Visit hotjar.com
Starting priceFree
Free planYes
What we like- Hotjar, now part of Contentsquare, remains the friendliest behaviour toolkit: heatmaps and recordings plus on site surveys and feedback widgets in one account, so you can watch a visitor struggle and ask visitors why in the same week. A free plan covers generous session volumes for small sites, and paid Growth plans start from about 39 dollars a month billed annually. For qualitative research, watching real sessions beats another dashboard.
Watch out for- Hotjar does not run A/B tests, so it explains problems but cannot prove fixes. Session caps on each tier mean high traffic sites either pay more or sample heavily. As part of Contentsquare, product packaging has been shifting, so confirm which features your plan includes at renewal.
Starting priceFree
Free planYes
What we like- Clarity is the easiest recommendation in CRO: heatmaps, session recordings, rage click and dead click detection, and basic insights, completely free with no traffic caps and no paid tier, from Microsoft. Paired with GA4, it gives a small team the full where and what of a conversion problem at zero cost. Setup takes minutes with one script tag, and data is not sampled away on busy days.
Watch out for- There is no testing, no surveys, and no support tier to buy when something breaks. Data retention and export options are limited compared with paid behaviour tools. Insights are helpful flags rather than deep analysis, so growing programmes graduate to Hotjar or a suite for research depth.
Starting price$29 per month
Free planNo
What we like- Crazy Egg is the simple end of behaviour analytics: clean heatmaps, scroll maps, and confetti reports that show exactly which elements earn clicks, priced from 29 dollars a month with a trial. For a small business owner who wants to see a page the way visitors use it, without learning an analytics discipline, it delivers answers in an afternoon. Its snapshot reports are easy to share with designers and copywriters.
Watch out for- Free tools have eroded its value: Clarity now covers basic heatmaps and recordings at no cost, a point several 2026 comparisons make bluntly. Recordings and testing features are thinner than Hotjar or VWO equivalents. It suits quick checks more than a sustained research programme.
#8Mouseflow
Best for: Session replay on a budget4.6/5 on
G2 (691 reviews, checked Oct 2026)
Visit mouseflow.com
Starting price$25 per month
Free planYes
What we like- Mouseflow focuses on session replay and form analytics: watch full visits, see which form fields cause abandonment, and build funnels around real behaviour, with a free plan covering 500 sessions a month and paid plans from 25 dollars. Form heavy businesses, lead generation, insurance, and finance pages especially, get specific value from its field level reporting. Friction scoring helps prioritise which sessions to watch first.
Watch out for- Session based pricing means busy sites climb tiers quickly, and the free allowance is a taster rather than a programme. It has no testing module, so fixes still need a testing tool or developer changes. Heatmap depth trails Hotjar for research led teams.
How we chose
We shortlisted the tools that 2026 CRO comparisons from Plerdy, The CSS Agency, Bund, and Landra rank most consistently, checked pricing against vendor pages and August to October 2026 price surveys, and balanced the list across behaviour analytics and experimentation rather than filling it with suites alone. We required each tool to be actively sold and supported, which excluded Google Optimize, shut down in 2023. Prices marked see website are genuinely quote only in this category; where a public figure exists, we printed it and noted the billing terms that change its meaning.
Start free and earn your way up. Install Clarity and confirm GA4 conversion tracking this week; watch twenty recordings of your highest value page and list the three worst friction points. That exercise, which costs nothing, tells you whether your problem is understanding behaviour or proving fixes. If you cannot see why people leave, add Hotjar or Mouseflow for surveys and form detail. If you know the likely fixes and have the traffic to judge them, buy testing: Convert for focused, privacy led testing, VWO for a suite, AB Tasty for personalisation with support, and Optimizely when experimentation becomes an engineering programme.
Pressure test any paid tool against your traffic before signing. Ask what monthly tested user volume the price assumes, what happens when you exceed it, how the tool handles consent mode and ad blockers, and whether results export to your analytics. Run one pre registered test with a stated hypothesis and a minimum effect worth detecting, and refuse to call results early: peeking and stopping on noise is how teams ship changes that do nothing. The best CRO tool is the one your team opens every week; an enterprise platform nobody logs into converts nothing at all.
Frequently asked questions
How much traffic do I need for A/B testing?
Enough to detect the effect you care about: a working rule is roughly 1,000 conversions a month on the tested experience for typical effect sizes. Below that, small differences are mostly noise, so favour recordings, surveys, and large clear changes over split tests, and let any test you do run run to its planned sample.
What is the best free CRO tool?
Microsoft Clarity, for unlimited free heatmaps and recordings, paired with GA4 for conversion counting. Hotjar and Mouseflow free plans add surveys and form analytics at small volumes. Free covers research well; it does not cover controlled testing, which is the paid step.
Can a CRO tool guarantee more conversions?
No. Tools measure behaviour and run experiments; outcomes depend on your offer, traffic, and the quality of your hypotheses. Vendors or agencies promising guaranteed lifts are describing best case anecdotes, not your result. Judge tools on evidence quality and workflow, never on promised percentages.
Is Google Optimize still available?
No. Google shut Optimize down in 2023, and it still appears in outdated lists. Current free practice is GA4 for measurement plus Clarity for behaviour, with a paid testing tool such as VWO or Convert when you are ready to run controlled experiments.
Should I buy an all in one suite or separate tools?
Separate tools usually win early: Clarity free plus GA4 costs nothing, and a focused testing tool is cheaper than a suite. Suites such as VWO earn their price when one team runs testing, research, and personalisation together and the shared tag and data save real hours each month.
Sources we checked (0)
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.