Many Dutch companies have been working with A/B tests, analytics and data-based decision-making processes for years. The level at which optimization is applied is correspondingly high. What is needed are not short-term adjustments, but clean methods, clear prioritization and reliable results.
Conversion optimization includes both targeted individual measures and the structured further development of central conversion paths. Tests are used to check assumptions and make well-founded decisions for the product, UX and business.
We have analyzed selected CRO agencies from the Netherlands that support companies in setting up optimization in a structured way and implementing it effectively in the long term.
Table of contents
How a CRO agency promotes your growth
Conversion optimization helps companies to make digital decisions in a comprehensible and verifiable manner. Instead of reacting to individual assumptions, structured analyses, clear hypotheses and controlled tests create a reliable basis for optimization decisions.
The added value lies not only in measurable conversion uplifts, but also in more transparent decision-making processes, more stable user paths and the continuous further development of digital products and services.
Top CRO agencies in the Netherlands 2026
In this overview, we present selected CRO agencies from the Netherlands. The selection covers different approaches, including strategic conversion optimization, experiment-driven testing as well as UX and data-based optimization models.
The following agencies are listed in alphabetical order and do not represent an explicit ranking.
Happy Horizon
Locations: Amsterdam, Arnhem, Eindhoven, Nijmegen, The Hague, Tilburg, Utrecht
Website: happyhorizon.com/en
Happy Horizon is an international digital agency with a strong focus on marketing, technology and data-driven business models. The agency supports companies in developing and implementing digital strategies that combine growth, brand strength and performance.
At Happy Horizon, conversion optimization is not an isolated individual service, but part of a holistic approach. Topics such as online marketing, data & automation, UX, technology and strategy intertwine to measurably improve digital touchpoints along the entire customer journey.
Focus of the services:
- Online marketing and performance campaign
- Data, analytics and marketing automation
- UX, design and digital platforms
- Strategy, innovation and digital transformation
- Brand development and positioning
- Industry solutions for B2B, healthcare and non-profit, among others
Highlights:
Happy Horizon combines marketing, data and technology expertise in interdisciplinary teams. The focus is on scalable digital solutions that combine strategic consulting with operational implementation.
Thanks to its work in various industries and markets, the agency has broad experience in complex digital projects in which performance, user experience and organization are considered together.
Benefit from the ideal combination of Varify.io® technologies and agency expertise.
Increase Conversion Rate is a specialized CRO agency with a clear focus on experimentation, research and structured optimization programs. The agency works exclusively on conversion-relevant issues and positions CRO as an independent discipline, not as an ancillary service.
The focus is on long-term experimentation programs, UX and conversion research as well as strategic consulting. Companies not only receive operational support, but are also assisted in setting up internal testing and experimentation structures.
Focus of the services:
- Conversion rate optimization (CRO)
- Experimentation programs & testing roadmaps
- UX & conversion research
- CRO audits & expert analyses
- Workshops, coaching & thought leadership
- Automation and tool support for testing
- Selection and use of testing tools
Highlights:
Increase Conversion Rate is fully specialized in CRO and experimentation. The focus is on structured test programs, well-founded research work and clearly defined hypotheses instead of selective optimization measures.
Another focus is on enablement and knowledge transfer. Workshops, coaching and strategic consulting play a central role in supporting companies in establishing sustainable experimentation and testing cultures.
Benefit from the ideal combination of Varify.io® technologies and agency expertise.
lyfto is a performance-oriented CRO agency with a clear focus on measurable conversion increases in e-commerce. The agency is data-driven and consistently aligns conversion optimization with profitability and business goals.
A central component of the collaboration is the clear definition of the target group. lyfto works exclusively with online shops that already have a certain level of maturity. Prerequisites for cooperation include at least 500 monthly purchases and a willingness to actively invest in growth and testing.
Focus of the services:
- Conversion Rate Optimization (CRO) for e-commerce
- Structured experimentation & A/B testing
- In-depth user and conversion research
- Performance-based optimization programs
- ROI-oriented prioritization of tests
Benefit from the ideal combination of Varify.io® technologies and agency expertise.
Highlights:
Yellowgrape is Two-time winner of the „Experimentation Heroes“ award“ and has extensive experience in structured testing. In the past five years, over 750 experiments carried out.
In general, Yellowgrape has implemented A/B testing in various industries for over 50 different customers carried out.
no.dots is a Dutch digital agency with a clear focus on conversion optimization, target group understanding and data-based decision-making. At its core is the systematic analysis of user needs and decision-making processes as the basis for effective optimization along digital touchpoints.
Conversion optimization is not viewed in isolation at no.dots. The agency combines qualitative and quantitative research with hypothesis development and testing to validate assumptions before implementing optimization measures. The approach is aimed at organizations that want to use CRO strategically and make well-founded decisions instead of short-term adjustments.
Focus of the services:
- Conversion optimization based on research
- Target group definition and target group validation
- User and decision research
- Development and prioritization of hypotheses
- Analysis and optimization of digital customer journeys
Highlights:
no.dots consistently bases conversion optimization on a founded understanding of the target group. Before implementing optimization measures, the agency attaches great importance to target group identification and validation in order to clearly record decision-making logic, needs and user motives.
Conversion optimization at no.dots follows a structured process of research, hypothesis development and validation. The approach is aimed at companies that want to use CRO strategically and achieve sustainable improvements instead of relying on short-term UX adjustments or isolated tests.
Benefit from the ideal combination of Varify.io® technologies and agency expertise.
Online Dialogue supports companies in making better digital decisions based on data, psychology and structured experimentation. The focus is on conversion optimization and the systematic use of tests to better understand user behaviour and develop digital experiences in a targeted manner.
For over 16 years, the agency has been supporting medium-sized and large companies in developing and scaling their experimentation capabilities. The aim is not to conduct as many tests as possible, but to learn which factors actually have an impact and how findings can be sustainably anchored in organizations.
Focus of the services:
- Conversion rate optimization (CRO)
- Experimentation strategy and governance
- A/B testing and experimentation implementation
- Consumer psychology and behavioral research
- UX optimization and digital accessibility
- Process mining and data-based customer journey analysis
- Training and capability building (Online Dialogue Academy)
Highlights:
Online Dialogue has More than 15 years of experience in the field of conversion optimization and experimentation. The agency works as a long-term partner for well-known organizations such as NS, DPG Media, Vattenfall, Bidfood and Wehkamp.
A central focus is on Capability Building. Online Dialogue supports teams in sustainably integrating experimentation into processes and decision-making structures. The agency is also heavily involved in the area of thought leadership, including through own events such as „Dialogue Donderdag“, training programs and specialist publications.
Benefit from the ideal combination of Varify.io® technologies and agency expertise.
Yellowgrape is a Dutch growth and experimentation agency with a focus on e-commerce. The starting point of its work is a clear distinction from purely intuitive marketing. Instead of making decisions based on gut feeling, the agency uses data-based methods to predict, manage and accelerate growth in a targeted manner.
Yellowgrape combines technological expertise with creative approaches. Experimentation, UX and data-driven analyses are used to systematically drive growth and ensure measurable optimization measures along the entire funnel.
Focus of the services:
- UX & experimentation with a focus on measurable optimization
- Full-funnel marketing for e-commerce growth
- Data & intelligence for decision support
- Branding and brand marketing
- Automation & Customer 360 approaches
- Strategy & innovation for scalable growth models
Highlights:
Yellowgrape is Two-time winner of the „Experimentation Heroes“ award“ and claims to have extensive experience in structured A/B testing. Over the past five years over 750 A/B tests which were systematically used to optimize digital touchpoints.
The agency has implemented A/B testing for more than 50 clients from various industries. Experimentation serves as a central instrument for securing decisions based on data and driving forward optimization in a comprehensible manner.
Benefit from the ideal combination of Varify.io® technologies and agency expertise.
