A conversion rate optimization tool is software that shows why visitors do not convert and helps you prove which change fixes it. The tools fall into six categories: analytics, behavior analytics, A/B testing, personalization, user research and landing page builders. Most teams should start with the free analytics and behavior layer and add A/B testing once traffic supports it.
Conversion rate optimization (CRO) is the practice of raising the share of visitors who complete a goal such as a purchase, a lead form or a demo request. This guide sits in the A/B testing hub and compares the categories, the named options in each and the prices vendors publish as of October 2026. For the method itself, start with the guide to conversion rate optimization.
Which six categories of conversion rate optimization tools exist?
Conversion rate optimization tools split into six categories by the job they do: analytics measures where visitors drop off, behavior analytics shows how they behave on a page, A/B testing proves a change works, personalization serves different versions to segments, user research asks people why, and landing page builders let marketers ship pages without developers.
The categories answer different questions, so one tool rarely covers the whole job. Behavior analytics is software that records clicks, scrolls and sessions and turns them into heatmaps and session replays. An A/B testing platform is software that splits traffic between a control and one or more variants and reports whether the difference is statistically significant. Personalization is the practice of showing a different page version to a defined audience instead of testing one version against another.
| Category | Question it answers | Named options | Free option |
|---|---|---|---|
| Analytics | Where do visitors drop off? | Google Analytics 4, PostHog | Yes: GA4, PostHog free tier |
| Behavior analytics | What do visitors do on the page? | Microsoft Clarity, Contentsquare (Hotjar), PostHog | Yes: Clarity, Contentsquare free plan |
| A/B testing | Does the change cause a lift? | Optimizely, Wingify (VWO and AB Tasty), Convert, Kameleoon, PostHog | PostHog free tier; others offer trials |
| Personalization | Which version fits which segment? | Kameleoon, Optimizely, Wingify | No |
| User research and surveys | Why do visitors hesitate? | Lyssna, Contentsquare surveys | Yes: limited free plans |
| Landing page builders | Can marketers ship and test pages alone? | Unbounce | Trial only |
Many vendors now sell several categories in one suite, which blurs the lines. Contentsquare bundles replays, heatmaps, funnels and surveys, and Wingify combines experimentation, personalization and behavior analytics. The categories still help you decide what to buy first, because each one depends on the data the earlier one provides.
Which free CRO tools cover analytics and behavior data?
Free CRO tools cover analytics and behavior data well as of October 2026. Google Analytics 4 handles funnels and conversion tracking, Microsoft Clarity adds heatmaps and session recordings without traffic limits, and the Contentsquare free plan and the PostHog free tier add replays, funnels and product analytics within published monthly caps.
Google describes Google Analytics as tools offered "free of charge", with Analytics 360 as the paid enterprise version. A standard property keeps event data for up to 14 months, against up to 50 months in Analytics 360. Clean conversion tracking matters more than any heatmap, and the way your attribution models credit conversions changes which pages look weak.
Microsoft Clarity calls itself "Free forever" with "No limits on traffic" and offers heatmaps and session recordings. Hotjar changed in a way many older comparison posts miss: Contentsquare's Hotjar page says it is no longer possible to create a new Hotjar account, and new users sign up on Contentsquare instead.
- Contentsquare free plan: 200k monthly sessions, one project, replays, heatmaps and funnels, with 5% of sessions captured for replay (max. 10k), per the Contentsquare pricing page.
- PostHog free tier: 1M product analytics events, 5K session recordings and 1M feature flag requests per month, with experiments billed through feature flags, per PostHog pricing.
Which A/B testing platforms replaced Google Optimize?
No single A/B testing platform replaced Google Optimize. Google's own help page names AB Tasty, Optimizely and VWO as integration partners, and in 2026 VWO and AB Tasty merged into Wingify. Convert, Kameleoon and PostHog are the other common choices, and only some of these vendors publish prices.
Google's sunset notice is short: "Google Optimize and Optimize 360 are no longer available as of September 30, 2023," and experiments still running on that date ended, according to Google Analytics Help. Teams that relied on a free testing tool had to pick a paid platform or a product analytics suite.
The vendor field changed again in 2026. Wingify announced on January 20, 2026 that VWO and AB Tasty had merged and that existing contracts, pricing and support stayed unchanged. A press release dated September 16, 2026 says both now operate under the Wingify brand, and the VWO and AB Tasty pricing URLs redirect to Wingify pricing, which offers "custom pricing tailored to your needs, based on factors like traffic volume".
| Platform | Entry price | Traffic included at entry | Free access |
|---|---|---|---|
| Optimizely | Quote only ("individually packaged") | Not published | Demo on request |
| Wingify (VWO and AB Tasty) | Quote only (custom pricing) | Not published | Free trial account |
| Convert Experiences | Growth: $399 per month billed monthly, $299 billed annually | 100K tested users per month | 15-day free trial |
| Kameleoon | Starter: from $495 per month | 50,000 monthly tracked users (MTUs), up to 10 experiments | 30-day free trial |
| PostHog | Usage based, free tier first | 1M feature flag requests per month free | Free tier |
| Unbounce (landing pages) | Experiment: $149 per month, $112 billed yearly | Up to 30,000 visitors | 14-day trial |
Sources for the table: Optimizely, Wingify, Convert, Kameleoon, PostHog and Unbounce. Traffic units differ by vendor (tested users, visitors, flag requests), so compare the plan against your own monthly volume, not against each other.
Where do personalization, user research and landing page tools fit?
Personalization, user research and landing page tools sit around the core of analytics and A/B testing. Personalization tools serve different versions to segments once you know which segments behave differently, user research tools explain why visitors hesitate, and landing page builders let a marketing team publish and test pages without a developer queue.
Personalization usually comes bundled with an experimentation suite rather than as a separate purchase. Kameleoon sells web experimentation, feature management and personalization, and Wingify lists Web Personalization next to experimentation. Buy it only when you can name the segment and the different message it needs, because personalization without a testing habit just adds versions nobody measures.
User research is the cheapest way to find the reason behind a drop-off. Lyssna offers a free plan with 15 self-recruited responses and a Growth plan at $199 per month billed monthly or $166 billed annually, with panel participants priced separately. Contentsquare's free plan adds on-site surveys to its behavior data.
Landing page builders matter most for paid media. On Unbounce, the Build plan at $99 per month has no A/B testing, so the cheapest plan with "Unlimited A/B testing" is Experiment. For ad-driven pages, check that the cost of the tool fits next to your Google Ads cost per click before you add it to the stack.
Which conversion rate optimization tool should you buy first?
The first conversion rate optimization tool to buy depends on monthly traffic and on who will run it. Sites with little traffic get more from free analytics, behavior analytics and user research than from testing, while a paid A/B testing platform pays off once key pages have enough conversions to finish tests and someone owns the program.
Traffic decides whether a test can finish. A test needs enough conversions in each variant to separate a real lift from noise, so a low-traffic page can run for months without a verdict. The team decides whether the tool gets used: a testing platform without a person who writes hypotheses, builds variants and reads results is a monthly invoice, not a program.
The decision table below is a rule of thumb, not a vendor rule. The traffic bands line up with entry plan limits that vendors publish, such as 30,000 visitors on Unbounce Experiment, 50,000 monthly tracked users on Kameleoon Starter and 100K tested users on Convert Growth.
| Monthly sessions on tested pages | Team | Buy first | Add next |
|---|---|---|---|
| Under 10,000 | Marketer, no developer | GA4 plus Microsoft Clarity (free) | User research (Lyssna free plan) |
| Under 10,000 | Product team with developers | PostHog free tier | Surveys or interviews |
| 10,000 to 50,000 | Paid media marketer | Landing page builder with A/B testing (Unbounce Experiment) | Contentsquare free plan for replays |
| 10,000 to 100,000 | One CRO owner plus developer time | Entry A/B testing plan (Convert, Kameleoon Starter) | Paid behavior analytics |
| Above 100,000 | Dedicated CRO or experimentation team | Quote-based platform (Optimizely, Wingify, Kameleoon Enterprise) | Personalization in the same suite |
Read the table by the traffic of the pages you will test, not the whole site. A blog with high traffic and a checkout with low traffic sit in different rows. Ad landing pages often qualify sooner than the site as a whole, which is why Performance Max asset testing and landing page tests tend to run side by side.
What should a trial of a CRO platform prove before you sign?
A trial of a CRO platform should prove four things before you sign: the script does not slow your key pages, its numbers match your analytics, it respects your consent setup, and the price at your real traffic level fits the budget. Convert offers 15 days, Kameleoon 30 days and Unbounce 14 days to check this (as of October 2026).
Most vendors offer a trial or free tier, and the trial is where hidden costs show up. Overage rules are one example: Convert lists extra tested users at $399 per 100K on its Growth plan, per its pricing page.
- Install the snippet on one key template. Compare page speed with and without it, and check for visible flicker when a variant loads.
- Run an A/A test. Serve the same page to both arms and confirm the platform reports no winner and that its conversion counts match GA4 within a small margin.
- Check consent handling. Confirm the tool fires only after consent where your consent banner requires it, and that EU data storage options exist if you need them.
- Price your real volume. Ask for a quote or calculate the plan at your monthly tested users, including overages and annual billing terms.
- Build one real variant. Have the person who will own the program build and launch a variant without vendor help.
Common mistakes when buying conversion rate optimization software
The common mistakes with conversion rate optimization software come from buying in the wrong order: a testing platform before tracking works, a suite before anyone owns tests, or a decision based on outdated comparison posts. Each mistake below costs money without producing a test result you can act on.
- Buying testing before tracking works. A/B tests report on the conversions your analytics records. Fix GA4 events and goals first, then compare variants.
- Relying on outdated vendor lists. Many comparisons still list Google Optimize, a VWO free plan or new Hotjar signups. Check the vendor pricing page on the day you buy.
- Paying for traffic you do not test. Plans are priced by tested users or visitors. Scope the snippet to the pages you test and size the plan to that volume.
- Treating personalization as a shortcut. Segment-specific versions need the same proof as any test. Without a control group you cannot tell whether personalization helped.
- Ignoring the people cost. Every platform needs hours for research, design, building and analysis. Budget those hours before the license.
