12 best website optimization tools to improve performance and conversions

Whether you're looking to speed up your site, boost search rankings, or increase conversions, the right website optimization tools help you identify what's working and what needs improvement in your site's functionality.

This guide covers 12 of the best tools available, so you can find the right fit for your goals and budget.

Key takeaways

• Website optimization tools fall into 6 main categories: speed, search engine optimization (SEO), user experience (UX), conversion rate optimization (CRO), mobile, and accessibility. Most sites need tools from multiple categories to cover all bases.

• Free tools like Google PageSpeed Insights, Google Search Console, and WAVE (Web Accessibility Evaluation Tool) provide strong starting points for beginners with limited budgets.

• All-in-one platforms like Contentsquare combine UX analytics, session replay, heatmaps, and conversion optimization to reduce tool sprawl and connect insights across your site.

• Choose tools based on your primary optimization goal, budget, and technical expertise level. Start with 1 or 2 tools, then expand as your needs grow.

Website optimization tools comparison

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12 best website optimization tools

1. Contentsquare

What it is: Contentsquare is an all-in-one Experience Intelligence platform that gives website owners a holistic view of their users, including their behavior, motivations, frustrations, and feedback.

What you can optimize: just about everything! Find and fix bugs, test your page speed, optimize page design for conversion rate, and improve UX with behavior tools like Heatmaps, Session Replays, and Surveys.

Pricing: free plan available; paid plans for higher volumes.

Best for: teams who want to combine quantitative analytics with qualitative user insights in one platform.

How to use it: sign up and add the Contentsquare tracking code to your site to instantly start gathering user data.

🤝 Your one-stop shop for website optimization insights

Contentsquare's capabilities and features work in harmony to give you customer-centric insights at both the quantitative and qualitative level, with quick and easy ways to jump between the 2.

Use dashboards to track your basic web analytics—things like conversion rate, bounce rate and traffic—then use heatmaps to get insights into the user behavior behind your numbers.

For example, if your dashboard reveals that conversions have decreased on a product page, you might examine a rage click map for that page. In this type of heatmap, 'hot' areas are ones where users often click repeatedly.

Want a faster route to insight? Use Contentsquare's Sense Analyst to ask direct questions about complex questions and get clear answers, guiding you through the next steps—no data expertise needed.

2. Google PageSpeed Insights

What it is: created by Google, PageSpeed Insights is a simple, free website speed checker.

What you can optimize: website page speed, desktop website performance, and mobile page speed.

Pricing: free.

Best for: quick speed diagnostics and identifying Core Web Vitals (CWV) issues.

How to use it: enter any URL and click 'Analyze'. PageSpeed Insights will return a page speed score out of 100 and give suggestions on how to make your site load faster.

3. Google Search Console (GSC)

What it is: Search Console is a free search optimization tool from Google, often cited as one of the best SEO resources available.

What you can optimize: measure SEO performance, view keyword impressions and clicks, see your backlinks, and check for crawling and speed errors.

Pricing: free.

Best for: SEO performance monitoring and identifying indexing issues.

How to use it: sign in with your Google account, verify site ownership, and wait for Google to collect data.

4. Screaming Frog

What it is: Screaming Frog is website crawling software for PC, Mac, or Linux.

What you can optimize: on-page and technical SEO—find broken links, check HyperText Markup Language (HTML) and Extensible Markup Language (XML) sitemaps, find duplicate content, check redirects, and analyze page titles and meta descriptions

Pricing: free for up to 500 URLs; paid license from $279/year.

Best for: technical SEO audits and site crawling.

How to use it: download Screaming Frog and enter a URL or sitemap to start crawling.

5. Ahrefs

What it is: Ahrefs is a comprehensive SEO toolset covering keyword research, backlink analysis, content exploration, and rank tracking.

What you can optimize: keyword rankings, backlink profile, content gaps, and competitor analysis.

Pricing: starts at $99/month (Lite plan).

Best for: keyword research and backlink analysis.

How to use it: sign up for an account, add your site to the dashboard, and use Site Explorer to analyze your domain's SEO health and backlink profile.

6. Semrush

What it is: Semrush is an all-in-one SEO and digital marketing platform with tools for keyword research, site audits, competitive analysis, and content optimization.

What you can optimize: organic search visibility, paid advertising campaigns, content performance, and competitive positioning.

Pricing: starts at $139.95/month (Pro plan); limited free tier available.

Best for: competitive analysis and all-in-one SEO management.

How to use it: create an account, run a site audit to identify technical issues, and use the keyword research tools to find opportunities.

7. Optimizely

What it is: Optimizely is a powerful web experimentation platform providing A/B testing and multivariate testing tools and website personalization.

What you can optimize: use A/B testing, split testing, and multivariate testing (MVT) to test variations of different web pages and measure how they perform.

Pricing: custom pricing; free trial available.

Best for: enterprise experimentation programs and personalization.

How to use it: sign up for an account and add a snippet of JavaScript code to your site to start running experiments.

💭 Did you know? Contentsquare integrates with Optimizely (and other experimentation tools) to automatically detect when your site visitors interact with an experiment control or variation page.

You can filter your Contentsquare session replays and heatmaps by Optimizely variant ID to see how visitors click, move, and scroll on each version, and how they respond to it.

8. VWO

What it is: Visual Website Optimizer (VWO) is a conversion rate optimization platform offering A/B testing, multivariate testing, and user behavior analytics.

What you can optimize: landing page conversions, checkout flows, and user engagement through experimentation.

Pricing: free plan available (VWO Testing Free); paid plans from $314/month.

Best for: CRO teams running structured experimentation programs.

How to use it: sign up, install the VWO SmartCode on your site, and use the visual editor to create test variations without coding.

9. GTmetrix

What it is: GTmetrix is a web page speed tool.

What you can optimize: page load speed.

Pricing: free basic reports; Pro plans from $14.95/month.

Best for: detailed speed reports with waterfall analysis.

How to use it: enter any URL and click 'Test your site' for a basic speed test. Then, click the drop-down menu on each recommendation to learn how to make your page load faster.

10. Google Analytics 4

• What it is: Google Analytics 4 (GA4) is Google's current web analytics platform, tracking user interactions across websites and apps.

• What you can optimize: traffic sources, user engagement, conversion funnels, and audience behavior.

• Pricing: free (GA4 360 enterprise version available).

• Best for: foundational traffic and conversion tracking.

• How to use it: create a GA4 property, add the tracking code to your site, and configure events and conversions to match your business goals.

For a deeper look at how GA4 compares to experience analytics platforms, see our guide on Contentsquare vs. GA4.

11. WAVE

What it is: WAVE is a web accessibility evaluation tool.

What you can optimize: find accessibility issues like missing alt text, small text size, and contrast errors that make your content inaccessible to screen readers.

Pricing: free.

Best for: accessibility compliance and Web Content Accessibility Guidelines (WCAG) audits.

How to use it: enter any URL and click through the icon-coded errors to see what to change and learn why improved accessibility is important.

12. Lighthouse

What it is: Lighthouse is Google's open-source auditing tool built into Chrome DevTools, providing automated checks for performance, accessibility, SEO, and best practices.

What you can optimize: page performance, accessibility compliance, SEO fundamentals, and progressive web app (PWA) readiness.

Pricing: free (built into Chrome).

Best for: comprehensive site audits during development.

How to use it: open Chrome DevTools (F12), navigate to the Lighthouse tab, select the categories you want to audit, and click 'Analyze page load'.

6 types of website optimization tools

The 12 tools above cover a range of optimization needs. But if you want to go deeper into a specific area—like making a landing page load faster or finding a new keyword for a blog post—it helps to understand the different categories of website optimization tools and what each one does.

Most sites need tools from multiple categories:

1. Page speed

2. Search engine optimization (SEO)

3. User experience (UX)

4. Conversion rate optimization (CRO)

5. Mobile-first

6. Accessibility

Some tools help you work on more than one area at once—for example, Contentsquare can be used to improve UX and conversion rates on desktop and mobile—but in general, you'll need to use multiple tools to optimize your entire website.

Think of it as one big optimization ecosystem: if you improve your website speed, you also impact your SEO, UX, and CRO efforts.

1. Page speed optimization tools

A slow website can drive users away and hurt search rankings. Page speed tools won't fix your slow site on their own, but they will measure page speed and show you what's slowing it down. You'll be able to pinpoint how to improve page load times by following recommendations like:

• Reducing and compressing HTML, Cascading Style Sheets (CSS), JavaScript, and images

• Caching content

• Using faster-hosting servers

Popular website speed optimization tools

• Contentsquare's Speed Analysis

• Pingdom

• WebPageTest

• Lighthouse

🚀 Using Contentsquare? You already have a web page speed tool. Contentsquare's Speed Analysis feature allows you to test how quickly your website performs. It runs in the background, automatically monitoring how key pages perform so you can catch any speed issues before they start to impact users.

2. SEO optimization tools

SEO helps you get more free website traffic from search engines like Google and Bing. There are many SEO optimization tools that help you optimize your site structure, keywords, and rankings. These include:

• Technical SEO tools to audit on-page SEO (like checking meta robots tags or 404 links)

• Keyword research tools to find keyword ideas and analyze search volume

• Rank tracking tools to measure and compare search traffic and how your site ranks in the search engine results pages (SERPs) for target keywords

• Content optimization tools to optimize for target keywords

• Backlink analysis tools to check which pages link to your site (or to competitors) and identify link building opportunities

• Video SEO tools to optimize your videos to rank highly on video search engines like YouTube

You can use specialist SEO tools that only do 1 thing (for example, Screaming Frog is a dedicated technical SEO tool), and all-in-one SEO tools, like Ahrefs, which do a little of everything.

Popular SEO tools and plugin options

• Bing Webmaster Tools

• Ahrefs

• Moz

• Semrush

• Clearscope

• Yoast SEO

• Google Trends

3. UX optimization tools

Great UX reduces friction and keeps visitors engaged. Many UX optimization tools are designed specifically to track, analyze, and improve user behavior across your site.

UX optimization tools won't magically improve your user experience, but usability testing will help you understand user behavior and diagnose problems to guide optimizations.

UX tools help with each step of the website and page optimization journey, from spotting where users get stuck to conducting user research.

Popular UX optimization tools

• Contentsquare

• UserTesting

• TryMyUI

• UsabilityHub

• Adobe Analytics

💡 Pro tip: Contentsquare gives you everything you need to understand your users' behavior on your site and optimize for the best UX possible, thanks to tools like:

• Session Replay: watch anonymous video-style replays of your users as they move through your site, allowing you to see exactly what they saw

• Impact Quantification: a tool that helps you size the impact of any technical and non-technical errors that appear on your site.

• Frustration Score: Contentsquare evaluates sessions based on signs of friction—that is, when users do things like rage click or repeatedly attempt to fill in the same form.

With frustration score data, you can see which pages and elements on your site most need UX optimization.

4. CRO optimization tools

When done right, CRO increases the number of website visitors who become customers (or perform any desired action on your site).

While there's no single tool that improves conversion rate, brands use a combination of:

• Traditional analytics (tools like Google Analytics or the Contentsquare's Product Analytics)

• Behavior analytics (tools like Contentsquare’'s Heatmaps, Session Replays, and Surveys)

• Testing tools (like Omniconvert)

Conversion rate is key to ecommerce business success, and CRO tools help you understand what encourages users to act—and what doesn’'t. By combining behavior analytics with A/B testing, these tools help you refine your pages until they convert more consistently.

Popular CRO tools

• Contentsquare

• Google Analytics

• Matomo

• VWO

• AB Tasty

📢 Pro tip: If you’re looking to boost your conversion rate, Contentsquare's suite of tools combines quantitative data and qualitative data.

For example, you can:

• Use dashboards to monitor your conversion data. If you see conversions for a particular page have dropped, click through to watch session replays of users interacting with that page. If something on the page has changed—a UX issue has cropped up or a link has broken—you'll be able to spot it immediately, fix it, and watch your conversion rate return to normal.

• Use Journey Analysis to see the paths users usually take to conversion and the pages they're most likely to drop off of. If there's a page with a particularly high drop-off rate, click through to related session replays to see how users behave at page level. Aggregate insights with Contentsquare's Sense Chat to find the fix to boost your conversions.

Contentsquare's AI Sense helps you make sense of your session replay data.

5. Mobile optimization tools

More people browse websites on mobile than desktop, so mobile-first optimization helps you ensure people view your site correctly on phones and tablets. Web elements like pop-ups, image-heavy pages, and tiny text can make your site difficult to navigate on mobile.

Check your analytics data to find out what percentage of your users and customers browse on mobile devices to understand how important mobile optimization is to your business.

If you're using Contentsquare, your dashboard gives you a breakdown of your site users' devices.

The traffic distribution module shows you which devices users accessed your site from.

Popular mobile website optimization tools

• Contentsquare

• Mobile-Friendly Test

• WebPageTest

Case study: how mobile optimization boosted De Beers' revenue

World-leading diamond company, De Beers, used Contentsquare to get heatmaps of their mobile site. They filtered a heatmap of their product page to show only users who converted and found most people scrolled all the way to the bottom of the page—even though the 'Add to Bag' CTA at the top of the page.

The De Beers team hypothesized most users weren't seeing 'Add to Bag' button, and so created a sticky CTA instead. This small change increased mobile conversions by +10%.

DeBeers' mobile product page, pre- and post-optimization with insights from Contentsquare.

6. Accessibility optimization tools

An inclusive web experience isn't optional—it's a core part of UX. Accessibility-focused website optimization tools help you detect and fix issues that could prevent users with disabilities from navigating your site. Making your site accessible also contributes to better SEO and broader customer reach.

Popular accessibility optimization tools

• Check My Colours

• EqualWeb

• Functional Accessibility Evaluator

• WAVE

How to choose the right website optimization tool

With so many options available, picking the right tool comes down to understanding your specific needs. Here are 6 criteria to guide your decision:

1. Define your primary optimization goal. Are you focused on speed, SEO, conversions, or user experience? Start with tools that directly address your biggest gap.

2. Consider your budget. Many free tools like Google Search Console, PageSpeed Insights, and WAVE cover the basics well. Paid tools offer deeper insights and automation.

3. Assess your technical expertise. Some tools (like Screaming Frog) require technical knowledge to interpret results. Others (like Contentsquare) visualize data in ways anyone can understand.

4. Check integration requirements. If you're already using analytics or experimentation tools, look for optimization tools that integrate with your existing stack. This reduces manual work and connects your insights.

5. Think about scalability. A free tool might work for a small site, but as traffic grows, you may need tools that handle higher volumes and offer more advanced features.

6. Prioritize actionable insights. The best tools don't just show you data—they help you understand what to do next. Look for tools that provide recommendations, not just reports.

Voice of Customer (VoC) as an optimization tactic

So far, we've covered tools that help you analyze behavior and performance data. But sometimes the best optimization tactic is the simplest: listening.

Even if you have the fastest website on the planet and rank high for your target keywords, no amount of speed or SEO is a substitute for asking users directly how they feel—otherwise known as collecting Voice-of-Customer (VoC) insights.

Try things like:

• Launching surveys to pop up on key pages, or at important moments in the customer journey

• Running 1-on-1 interviews to discuss pain points and moments of delight users experience on your site

• Conducting user tests to understand how users complete simple tasks on your site, and hear about any unexpected complications they experience

Once you've asked users what they expect from your website, and how they find the experience of navigating it, you can develop an optimization strategy that delivers exactly what they need.

FAQs about website optimization tools