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CRO Testing That Moves the Needle

Getting more from the traffic you already have is smart. We develop hypotheses based on real user data – heatmaps, session recordings, funnel analysis – and test systematically what actually moves your conversion rate. Every test is statistically planned so results are reliable and your next feature is built on genuine evidence.

The essentials of CRO Testing

  • We extract more from your existing traffic instead of expensively buying new traffic – through systematic conversion-rate testing.
  • We derive every test hypothesis from real user data – heatmaps, session recordings and funnel analysis – not from the gut feeling of the loudest person.
  • We plan every A/B or multivariate test on headlines, CTAs, forms, layouts and checkout steps with the required sample size up front and don't stop early.
  • We complement quantitative tests with qualitative methods to see not only what converts better but why.
  • We document every test with hypothesis, methodology and result, building a company-specific knowledge base that makes each further test more precise.
More conversions – without more budget

You make changes to your website but cannot prove afterwards whether they made a difference.

Your traffic is growing but conversion rate stagnates – and you do not know where in the funnel users drop off.

Changes are prioritised based on gut feeling rather than real user data.

Hypothesis Development

Good tests start with a clear hypothesis: which element creates friction, what change should reduce it, and what result do we expect? We derive hypotheses from user data, heatmaps and funnel analysis – not from opinions.

A/B and Multivariate Testing

We plan and run A/B tests on headlines, CTAs, forms, page layouts and checkout steps. Every test runs to statistical significance – we do not stop early because an interim result looks good. Findings are documented and accumulated.

Qualitative Methods as Complement

A/B tests tell you what converts better – but not always why. We complement quantitative tests with qualitative methods: session recordings, heatmaps and brief in-page surveys. This way we understand the cause behind the numbers.

Documentation and Knowledge Building

Every test is documented with hypothesis, methodology, result and interpretation. Over time this builds a company-specific knowledge base showing what moves your specific audience – and makes future tests more precise.

From user data to proven insight

CRO Testing follows a fixed sequence – from data collection to documented learning. Each step builds on the last so that no test runs without direction.

  1. Data collection

    Heatmaps, session recordings, and funnel analyses reveal where users actually drop off.

  2. Hypothesis development

    Patterns in the data shape a clear assumption: what should change – and why?

  3. Test design & sample planning

    Test variant, control group, and required sample size are defined before the test starts.

  4. A/B or multivariate testing

    The test runs until statistical significance is reached – not until patience runs out.

  5. Evaluation & knowledge building

    Win or lose: every result is documented and makes the next test more precise.

The cycle doesn't end at the result – every insight feeds the next hypothesis.

What makes an A/B test valid

Not every test yields reliable insights. These factors determine whether a result is actually worth acting on.

  • Statistical significance & sample sizeStopping too early is the most common mistake
  • Clear, data-backed hypothesisWithout a hypothesis, no learnable outcome
  • Clean control groupEvery confounding variable distorts the result
  • Qualitative data basis (heatmaps, recordings)Shows the where before the test explains the why
  • Continuity & test historyAccumulated knowledge sharpens every follow-up test

Relative weighting

Relative weighting by influence on result quality – not absolute measurements.

What matters for CRO Testing

The most expensive lever in marketing is often buying more traffic. The smarter one is getting more out of what you already have, and that's exactly where CRO starts. But changes that feel like progress prove nothing unless you test them against a control. The first principle is therefore: no claim without a test, and no test without a clean comparison.

Every test needs a hypothesis or it's a gamble. Only when it's clear why a change should lead to a better conversion can you draw a real insight from the result, whether it wins or loses. The hypothesis is fed by real user data such as heatmaps, session recordings, and funnel analyses, not by the gut feeling of the loudest person.

Statistics beat speed. An A/B test stopped too early suggests a winner that doesn't exist and is one of the most common error sources in CRO. Clean work defines the required sample size up front and accepts that reliable results take patience.

The real value of CRO accrues over time. Every test yields insights about your specific audience that make the next one sharper. Whoever tests continuously builds a knowledge advantage that a single stroke of genius never reaches.

Statistics before speed

A/B tests ended too early are one of the most common sources of error in CRO. A test must run long enough for the sample size to allow statistically significant results – otherwise you are optimising on chance.

Hypothesis before test

A test without a hypothesis is a lottery. Only when it is clear why a change should lead to a better conversion can you draw a real insight from the result – regardless of whether it wins or loses.

Accumulated knowledge beats single tests

The value of CRO grows over time: each test produces insights about your specific audience that make the next test more precise. Businesses with a long testing history have a sustained optimisation advantage.

Test, don't guess

At the center of what we do are innovative digital marketing strategies tailored exactly to your needs and goals. We turn digital challenges into measurable success.

  1. Strategy across every channel

    We treat SEO, paid, social and content as one system, not as isolated single measures.

  2. Latest technologies and trends

    From performance platforms to GEO/AI visibility, we use what actually drives reach today.

  3. Proven campaign experience

    We've run successful campaigns across industries and budgets and know what scales.

  4. Creative minds and technical experts

    Idea, design and tracking come from one team: creative impact meets clean measurability.

  5. Sustainable growth

    We build visibility and performance that carry beyond the single campaign.

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Profile picture of Kevin Bolleßen, Head of BD & Digital Marketing
Kevin Bolleßen
Head of BD & Digital Marketing

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Frequently asked questions

How much traffic does my site need for meaningful A/B tests?
As a rule of thumb, each test variant needs at least 200–500 conversions to deliver statistically robust results. With low traffic we focus on direct UX improvements based on qualitative data rather than classic A/B tests.
Which tools do you use for CRO testing?
We work with AB Tasty, VWO or comparable tools – depending on budget and existing infrastructure. For heatmaps and session recordings we use Microsoft Clarity or Hotjar. Tool selection always aligns with your requirements and existing stack.
Does CRO testing make sense for B2B sites with few leads?
Yes, but with an adapted methodology. With low conversion volume we rely more on qualitative methods and micro-conversion tests – such as CTA click-through rate or scroll depth – rather than classic A/B tests on macro-conversions like form submissions.