Top 18 A/B Testing Companies in Europe (2026)

At Gilzor we build web applications and digital products with continuous improvement in mind, treating A/B testing as a practical way to validate design, functionality, and user experience decisions. Instead of relying on assumptions, we compare different interface elements, user flows, and content variations to understand how people interact with a product before broader changes are introduced.

Our work combines A/B testing with custom web development, UX design, quality assurance, and ongoing product optimization. Because experimentation is part of the development process, we can evaluate new ideas, measure their impact, and refine websites and applications based on real user behavior. This approach helps businesses make informed decisions while supporting long-term product growth.

Oski solutions develops custom websites and web applications while providing ongoing technical support and maintenance for digital platforms. A/B testing fits naturally into this process by allowing different layouts, content, calls to action, and user journeys to be evaluated before permanent changes are introduced. This helps decisions be based on measurable user behavior rather than assumptions.

The company continues working with many projects after launch through maintenance, performance improvements, and feature development. As websites evolve, experimentation becomes part of regular optimization, making it possible to assess design updates and usability changes while keeping the technical foundation of the website reliable and up to date.

SOMO is a boutique digital marketing agency that helps businesses improve digital performance through continuous testing, optimization, and data-driven decision-making. A/B testing is one of the company's core conversion rate optimization services, allowing different versions of websites, landing pages, and user experiences to be evaluated using real customer behavior instead of assumptions.

The agency combines experimentation with paid media, SEO, analytics, and broader digital marketing strategies to support ongoing business growth. By following a process of testing, learning, and refining, SOMO helps clients identify opportunities to improve conversion rates, enhance user experience, and make informed decisions based on measurable results.

A-Listware builds custom software, web applications, and enterprise solutions for companies that need dedicated engineering teams and long-term development support. Within digital product development, A/B testing can be used to compare interface changes, workflows, and new functionality before they become part of a production environment, helping teams evaluate updates with measurable user feedback.

The company combines software engineering with quality assurance, data services, cloud technologies, and application support across the product lifecycle. This broader technical environment allows experimentation to be introduced alongside development, testing, and ongoing product improvements while keeping web platforms and business applications aligned with changing requirements.

Conversion Rate Experts is a UK-based conversion optimization agency that helps businesses improve website performance through structured experimentation. A/B testing is used to evaluate changes across landing pages, user journeys, forms, calls to action, and other conversion-focused elements, allowing decisions to be guided by measurable customer behavior rather than assumptions.

The agency combines experimentation with user research, analytics, copywriting, and interface improvements to identify opportunities for increasing conversions. Instead of treating testing as a standalone activity, Conversion Rate Experts integrates it into a broader optimization process where insights from research are validated through controlled experiments before permanent changes are introduced.

Lengreo combines custom website development with digital strategy, helping businesses create websites that support lead generation and user engagement. A/B testing is relevant throughout this process because it allows different page layouts, messaging, forms, and conversion paths to be evaluated using real visitor behavior before design decisions are finalized.

Website projects are supported by services such as UX-focused design, SEO, and ongoing optimization, giving businesses opportunities to refine their online presence after launch. By improving both the technical structure of a website and the way users interact with it, the company incorporates testing into a broader approach to website performance and conversion improvement.

Conversion is a UK consultancy dedicated to conversion rate optimization and experimentation. A/B testing sits at the center of its approach, with specialists designing, building, and analyzing experiments that help businesses understand how changes to messaging, design, functionality, and customer journeys influence user behavior. The agency also supports organizations in establishing structured experimentation programs that become part of long-term product and digital growth strategies.

Its work extends beyond individual website tests to include personalization, product and pricing experimentation, user research, analytics, and enterprise consulting. By combining research with continuous experimentation, Conversion helps businesses improve customer experiences through evidence-based decisions rather than assumptions.

Creative CX is a UK agency focused on conversion rate optimization, experimentation, and customer experience improvement. A/B testing forms part of its optimization process, helping businesses compare different versions of web pages, user journeys, and interface elements to understand which changes have the greatest impact on conversions and engagement.

The agency combines experimentation with user research, analytics, UX design, and digital strategy to support continuous website improvement. Rather than introducing changes based on assumptions, Creative CX uses research and testing to validate ideas before they are implemented more broadly, allowing optimization to become an ongoing part of digital growth.

Henkan & Partners is a Belgian consultancy that specializes in experimentation and conversion rate optimization for digital products and websites. A/B testing is a central part of its methodology, enabling organizations to validate ideas through controlled experiments and understand how different experiences influence customer behavior before making permanent changes.

The consultancy supports businesses with experimentation strategy, customer research, analytics, and personalization, helping teams establish structured testing programs instead of isolated one-off experiments. By combining research with continuous optimization, Henkan & Partners helps organizations make product and marketing decisions based on measurable evidence gathered from real users.

ONTRACK Digital is a Malta-based digital marketing agency that offers A/B testing as part of its conversion rate optimization services. The agency helps businesses compare different versions of landing pages, website elements, and user journeys to identify changes that improve conversions and overall website performance through measurable results.

A/B testing is supported by analytics, user behavior analysis, and ongoing optimization, allowing marketing decisions to be validated with real data. The agency also works across SEO, paid advertising, and digital strategy, giving clients the opportunity to apply experimentation across multiple channels while continuously refining their online presence.

Conversionista is a Swedish digital growth consultancy that helps organizations improve websites and digital products through structured experimentation. A/B testing is one of its core services, supporting businesses in validating design concepts, business ideas, and optimization opportunities with measurable evidence rather than assumptions. The agency applies experimentation as part of a broader data-driven approach to digital decision-making and long-term growth.

Its work combines experimentation with digital strategy, user research, and data analysis to uncover opportunities for improving customer experiences and business performance. By connecting research findings with continuous testing, Conversionista helps organizations establish experimentation programs that support ongoing optimization across websites and digital services.

DRIP Agency is a German conversion rate optimization consultancy that helps e-commerce businesses improve digital performance through structured experimentation. A/B testing forms the foundation of its optimization process, with experiments designed around user research, behavioral analytics, heatmaps, and quantitative data before new ideas are implemented. This research-first methodology helps businesses validate changes using measurable customer behavior instead of assumptions.

The agency supports ongoing experimentation across product pages, checkout flows, landing pages, and other stages of the customer journey. Alongside designing and managing A/B tests, DRIP Agency analyzes experiment results to identify optimization opportunities and build long-term testing programs that contribute to continuous website improvement.

Omniconvert specializes in A/B testing and conversion optimization, helping businesses improve websites through structured experimentation and audience segmentation. The company enables teams to compare different versions of web pages and digital experiences across desktop, mobile, and tablet devices, allowing optimization decisions to be based on measurable user behavior and experiment results.

Its capabilities extend beyond standard A/B testing to include website personalization, split URL testing, customer surveys, and advanced visitor segmentation. By combining experimentation with behavioral insights and statistical analysis, Omniconvert supports continuous optimization while helping organizations deliver more relevant digital experiences to different audience groups.

Varify.io focuses on A/B testing and website experimentation, providing businesses with tools to create, manage, and evaluate experiments without extensive technical implementation. The company allows marketing and product teams to compare page variations directly in the browser while integrating experiments with existing analytics solutions for performance measurement.

Its experimentation capabilities include A/B tests, multivariate tests, split URL testing, and audience targeting based on user behavior and other conditions. Instead of replacing established analytics workflows, Varify.io connects with external analytics platforms, allowing organizations to incorporate experimentation into their existing optimization and reporting processes.

AGConsult is a Belgian conversion rate optimization consultancy that helps businesses improve digital experiences through research-driven experimentation. A/B testing plays a central role in its methodology, allowing website changes, interface improvements, and new ideas to be validated with real user data before wider implementation. The company combines experimentation with user insights to support evidence-based decision-making across digital channels.

Its approach brings together UX research, behavioral analysis, customer testing, and conversion optimization to identify opportunities for measurable improvement. By integrating research findings into continuous experimentation, AGConsult helps organizations refine customer journeys and optimize website performance over time.

Opace is a UK digital agency that incorporates A/B testing into website optimization and digital experience improvement. The company helps businesses evaluate different versions of landing pages, website content, and user journeys, using structured experiments to identify changes that improve engagement and conversions.

Alongside experimentation, Opace provides conversion optimization, web development, SEO, and digital marketing services that support long-term website performance. Its testing process includes planning experiments, measuring outcomes, and applying insights to future optimization activities, allowing decisions to be guided by measurable user behavior.

Itexus develops custom software and web applications for businesses building digital products across finance, healthcare, logistics, and other industries. A/B testing supports this work by helping product teams evaluate interface changes, user flows, and new functionality before wider deployment, allowing product decisions to be informed by measurable user behavior throughout the development process.

The company delivers end-to-end engineering services that include business analysis, UI/UX design, quality assurance, and ongoing product support. Combining these capabilities with continuous product improvement enables digital solutions to evolve through iterative testing, optimization, and validated enhancements after launch.

Mobian Studio builds custom mobile and web applications with a focus on creating digital products that continue to evolve after launch. A/B testing contributes to this process by allowing product teams to compare different user interfaces, onboarding flows, and feature implementations, helping improvements be guided by measurable user interaction rather than assumptions.

Its services cover product discovery, UX/UI design, software engineering, and quality assurance, giving businesses support throughout the entire product lifecycle. By combining development with continuous refinement and technical validation, Mobian Studio helps organizations improve digital products as user needs and business requirements change.