CRO · Conversion Rate Optimization

CRO that turns your traffic into measurable pipeline.

Conversion Rate Optimization with our own framework: ICE-prioritized hypotheses, self-hosted GrowthBook (no data leak), server-side tracking via GTM, cadence 4+ A/B tests/month, validated win-rate ≥ 25%. Retainer from €3,800/month. 6 years optimizing B2B websites and DTC ecommerce.

Request CRO audit →See framework

≥25%

Guaranteed validated win-rate

4+/m

A/B test cadence

+22%

Avg. client conversion lift 6 m

3,800€/m

CRO retainer from

In short

What is CRO and why do you need a serious framework?

CRO (Conversion Rate Optimization) is the discipline of increasing the percentage of visitors who complete a business action (lead, sign-up, purchase, booking). Serious framework = data-prioritized hypotheses (not best practices), A/B tests with statistical significance (Bayesian GrowthBook), server-side attribution to real revenue (no vanity), cadence ≥ 4 tests/month with win-rate ≥ 25%.

Used by B2B with > 30-day sales cycle (optimizes form-fills, demo requests, qualified leads) and DTC ecommerce (optimizes product pages, checkout, upsell, LTV). Ranges: one-shot audit from €4,800, CRO retainer from €3,800/month (1 consultant + analytics), premium retainer €8,500/month (dedicated squad). Minimum 6 months to see stable impact.

Companies already moving their number with us

90% of A/B tests fail due to poor prioritization, lack of traffic or incorrect significance. Serious CRO is not random A/B — it is a framework.

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What is included · CRO framework

Six components of a complete CRO framework.

CRO is not "testing red vs green buttons". It is 6 components: research + hypotheses, ICE prioritization, A/B test infra, server-side attribution, analytics, executive reporting. All with RevOps-friendly ownership.

Component 1 · research

Hypotheses + data + user research

Quantitative analysis (GA4, Hotjar, heatmaps) + qualitative (usability testing, user interviews). Generates 20-40 documented hypotheses with data source. Prioritized backlog.

Included in audit

Component 2 · ICE scoring

Impact × Confidence × Ease prioritization

ICE scoring (Impact × Confidence × Ease) on every hypothesis. Top 10 tests/quarter defined by data. No best practices without your own evidence. Transparent roadmap.

Included

Component 3 · test infra

GrowthBook self-hosted + SDKs

Self-hosted GrowthBook (no external SaaS with data leak). JS/PHP/Python SDKs for your stack. Feature flags + targeting + mutual exclusion. Multi-variant experiments + Bayesian significance.

Included

Component 4 · tracking

GTM server-side + event schema

Server-side GTM (cookieless) with documented event schema (ecommerce + B2B leads). Stape.io or Cloudflare Workers. iOS 17 resistant. Real revenue attribution, no vanity.

Included

Component 5 · analytics

BigQuery + Looker dashboards

BigQuery as unified data warehouse (web + CRM + ads). Looker dashboards with conversion by channel, segment, persona, LTV cohorts. Reusable query templates. Zero manual spreadsheets.

Included

Component 6 · reporting

Monthly win-rate + learnings

Monthly executive report with tests run, win-rate, validated lift, estimated revenue impact, learnings + new hypotheses. Quarterly retrospective with stakeholders.

Included

ICE framework · cronuts methodology

ICE framework. 4 tests/month minimum. Win-rate ≥ 25%.

Every hypothesis is prioritized with ICE scoring (Impact × Confidence × Ease). Tests run in GrowthBook with Bayesian significance. Validated win-rate ≥ 25% or retainer extended at no cost. Zero random A/B tests.

Impact score · 1-10 based on revenue potential (historical data)
Confidence score · 1-10 based on prior evidence (quant + qual)
Ease score · 1-10 based on dev effort and required traffic
Bayesian significance 95% via GrowthBook (not frequentist)
Guardrail metrics · non-degradation monitoring (NPS, SEO)
Minimum sample size calculator · required traffic pre-test
Mutual exclusion · avoid contamination between parallel tests
Test lifecycle: hypothesis → mockup → QA → live → analysis → docs

6 winningest test categories

01
Value props + headlines
Clarity · specificity · buyer outcome · A/B hero
Top 1
02
CTA language + placement
Action verb · color · position · sticky · multi-step
Top 2
03
Social proof + trust
Reviews · logos · case studies · testimonials
Top 3
04
Form length + multi-step
Reducir fields · progressive disclosure · conditional
Top 4
05
Urgency + scarcity
Countdown · stock · exclusive · ethical not manipulative
Top 5
06
Pricing + packaging
Pricing table · bundles · guarantee · decoy effect
Top 6
07
Visuals + UGC
Lifestyle · product detail · customer photos · video
Optional
08
Mobile-specific
Thumb-zone · sticky CTA · floating nav · mobile forms
Optional

Validate hypotheses with usability testing →

6-month minimum retainer

CRO is not a one-shot project. Tests require enough traffic + significance + accumulated learnings. Minimum 6 months for stable impact. Renewable quarterly retainer with break-clause if no result.

How we work

Three phases. Infra in 30 days. Monthly cadence.

CRO audit + infra deploy in 30 days. Cadence 4+ A/B tests/month from month 2. Monthly executive report with win-rate + revenue impact. Renewable quarterly retainer.

Phase 01 · Audit + infra

Hypotheses + GrowthBook live

GA4 + Hotjar + CRM audit to generate 20-40 documented hypotheses. Deploy self-hosted GrowthBook + server-side GTM. ICE scoring top 10 tests quarter 1. Sample size calculator signed off.

Week 1–4Infra live

Phase 02 · Monthly test cadence

4+ A/B tests/month + analysis

Running 4+ A/B tests/month with Bayesian significance. Mockups + pre-launch QA. Post-test analysis in < 48 h. Learning docs. New hypotheses based on wins + losses. Guardrail metrics monitoring.

Month 2+4+ tests/month

Phase 03 · Reporting + scaling

Monthly win-rate + squad

Monthly executive report with win-rate, validated lift, estimated revenue impact, learnings. Quarterly retrospective with stakeholders. Option to scale to premium squad with dedicated consultant + analytics + email marketer.

QuarterlyRenewable retainer

Real cases · CRO B2B and DTC

CRO with validated win-rate and revenue attribution.

B2B Industrial · Lead gen CRO

+32 % MQLs

Eninter: multi-step form CRO + trust signals. Win-rate 38%. Qualified MQLs +32%.

Multi-step formTrustWin-rate 38%

View case →

JAX case — product pages CRO, industrial B2B

B2B USA · Product pages CRO

+38 % conv

JAX: product pages CRO + pricing table. 14 tests/6m, win-rate 31%. +38% conv.

Product pagesPricing14 tests

View case →

Grup Olivé case — booking flow CRO, hospitality

Hospitality · Booking flow CRO

+42 % bookings

Grup Olivé: booking flow CRO + ethical urgency. Win-rate 44%. Bookings +42%.

Booking flowUrgencyWin-rate 44%

View case →

See all cases 32 cases published

CRO truths 2026

Six things your previous CRO consultant winged.

Generic best practices lie. Your data tells you what to test, not a blog post.

A/B without sample size = statistical garbage. Calculate required traffic pre-test.

Frequentist 95% significance misleads you. Bayesian is more honest and faster.

Guardrail metrics are mandatory. Lifting conversion while tanking NPS = losing.

CRO without server-side attribution = optimizing on fake data. iOS 17 lies to you.

Tests that "lose" teach you the most. Document losses, don't hide them.

Verified reviews · CMOs and product managers

CRO that converts with method, not guesswork.

★★★★★ 4.9 / 5 · 34+ verified reviews

See all on Google →

Frequently asked questions

What CMOs and product managers ask us about CRO.

How much does a CRO retainer cost?

Ranges: one-shot audit €4,800-8,500 (executive document + 20-40 hypotheses + ICE scoring, 4-6 weeks). CRO retainer €3,800/month (1 senior consultant + GrowthBook + tests + reporting, 6-month minimum). Premium retainer €8,500/month (dedicated squad: consultant + analytics + email marketer + dev).

How much traffic do I need to run A/B tests?

It depends on the test. Homepage or main landing: > 10K visitors/month (rule of thumb). Ecommerce product pages: > 5K product views/month. Checkout: > 500 checkouts started/month. With less traffic, we use Bayesian stopping (GrowthBook) or qualitative tests (usability testing) to generate hypotheses.

Why self-hosted GrowthBook and not Optimizely or VWO?

Self-hosted GrowthBook: open source, your data on your infra (no external SaaS with leak), native Bayesian, advanced targeting, unified feature flags + experiments. Optimizely: expensive SaaS (€30-50K/year), data off-site. VWO: client-side, blocked by iOS 17 + adblockers. That's why GrowthBook.

How long until CRO results show?

Month 1: audit + GrowthBook deploy + first documented hypotheses. Month 2-3: first tests live + 1-2 validated wins. Month 4-6: stable +15-25% conversion attributed to CRO. Month 9+: improved LTV, optimized CAC payback, data culture installed.

What is "win-rate ≥ 25%"?

Of every 10 A/B tests run, at least 2-3 are statistically valid wins (Bayesian significance 95%) with positive conversion impact. Industry standard: 15-20%. Our guarantee: ≥ 25% validated, or we extend the retainer one month at no cost.

What are "guardrail metrics"?

Non-degradation metrics we monitor on every test: NPS, SEO rankings, page speed, bounce rate, session duration, CLS. A test that lifts conversion but tanks NPS 30% = net loss, not win. Ethics and sustainability over short-term optimization.

Do you also test losing tests?

Yes. Tests that "lose" teach the most: they unlock false assumptions from the internal team. We document losses with analysis of why they lost → new hypotheses. A typical retainer: 40% wins, 30% flat, 30% losses — all with learnings.

How does it connect with other services?

CRO combines with: usability testing (generates qualitative hypotheses), CRM integration (server-side attribution + enrichment), custom web development (if you need redesign + CRO from day 1). Bundle retainer + retainer: -10%.

CRO audit · free · 7 days

CRO audit with 10 ICE hypotheses.

We analyze your GA4 + Hotjar + CRM to detect conversion levers. Executive document with 20-40 documented hypotheses + top 10 ICE-prioritized + lift estimate. If there are no opportunities, we tell you before signing.

Validated win-rate ≥ 25% in retainer or we extend an extra month free.