CRO Agency: Conversion Rate Optimization That Pays
We don't manage tests. We manage profitability per visitor. Methodology with 95% statistical significance, not design opinions. Fixed fee, no percentage of revenue.
- 95% Statistical Significance
- 01 · Collection First-party events
- 02 · Model Attribution and sessions
- 03 · Dashboards Revenue, not page views
- 04 · Hypothesis What to change and why
- 05 · Experiment Rigorous A/B tests
- 06 · Decision Your team chooses with evidence
- Every experiment feeds the next one
In numbers
Auditable Results
Aggregated metrics from CRO programs managed in 2024.
- +25% Revenue per Visitor Average improvement in 6 months
- 68% Success Rate Tests with positive lift
- 4.2x Program ROI For every euro invested
- 15+ Years of Experience Optimizing since 2009
Definition
What Is CRO and Why Do You Need a Specialized Agency?
CRO (Conversion Rate Optimization) is the discipline of improving the percentage of visitors who complete a desired action on your website. But the correct metric isn't just conversion: it's Revenue per Visitor (RPV), which captures both rate and value.
What's included
Service Deliverables
What you get. No ambiguity.
- Free heuristic audit of your funnel + opportunities
- Prioritized backlog of 20+ testable hypotheses
- Variant design and development for each test
- A/B tool configuration (VWO, Optimizely, AB Tasty)
- Statistical analysis of each test with documented p-value
- Real-time results dashboard (Looker Studio)
Why
Opinion CRO vs Scientific CRO
The problem with the "CRO" you know.
Traditional agencies: change button colors because it "will look better", don't calculate sample size, and stop tests when they see green. We: hypotheses based on data, sample size calculated before starting, tests run until significance, and documented learnings. Every test has demonstrable statistical validity.
- +25% RPV
- 95% Confidence
- Not opinions Data
What's included
Executive Summary
What leadership needs to know to decide.
- Typical ROI 3-5x in the first 6 months of program
- Visible results from test 2-3 (4-6 weeks)
- Fixed monthly fee tailored to your funnel complexity
- Requirement: minimum 10,000 visits/month for significance
- Main risk: without correct tracking, optimization impossible
- Cumulative impact: winners compound quarter over quarter
What's included
Summary for CTO / Technical Team
Technical implementation requirements.
- Google Analytics 4 configured with conversion events
- Tag Manager implemented for variant injection
- Access to A/B tool (we provide if you don't have)
- Load time <3s to avoid contaminating tests
- Ability to quickly deploy winners (no months-long queue)
- CRM integration for tracking real revenue, not just leads
Who it is for
Is It for You?
CRO requires sufficient traffic to validate tests. If you don't have 10K visits/month, start there.
Who it's for
- E-commerce or SaaS with +10,000 visits/month (minimum for significance).
- Companies that measure revenue and margin, not just conversion counts.
- Teams with ability to implement changes quickly on the website.
- Organizations that make data-driven decisions, not opinion-based.
- Businesses with validated product-market fit looking to optimize, not validate.
Who it's not for
- Sites with less than 5,000 visits/month (tests won't reach significance).
- Companies wanting "design changes" without measuring impact.
- Organizations where every change requires months of approval.
- Businesses without revenue tracking attributed to web.
- Websites with severe technical issues (better to fix first).
Key points
Optimization Areas
Where we apply CRO with greatest impact.
- 01
Landing Pages and Home
Value proposition optimization, above the fold, and primary CTAs. Headline, social proof, and friction reduction tests on your landing pages. Typical impact: +15-30% in conversion.
- 02
Checkout Funnel
Cart abandonment reduction: guest checkout, progress indicators, trust signals, payment options. Tests on each funnel step. Typical recovery: 10-20% of abandonments.
- 03
Product Pages
Description, images, reviews, urgency optimization. Layout, pricing display, cross-sell tests. Focus on Average Order Value, not just conversion.
- 04
Forms and Lead Gen
Field reduction, progressive profiling, multi-step forms. Copy, incentive, and timing tests. Typical improvement: +20-40% in completion rate.
How we work
Work Process
From audit to continuous optimization.
- 01
Audit and Discovery
Heuristic analysis, heat maps, session recordings, surveys. Generation of 20+ prioritized hypotheses backlog by impact x confidence. Free initial audit.
- 02
Setup and First Tests
A/B tool setup, goal configuration, variant design. Launch of first 2-3 tests with calculated sample size.
- 03
Iteration and Scale
Results analysis with 95% significance. Winner implementation. Learning documentation. Weekly meetings with business metrics.
Key points
Risks and How We Mitigate Them
Transparency about what can go wrong.
- 01
Inconclusive Tests
With low traffic, tests don't reach valid conclusions. Mitigation: we calculate sample size before launch. If insufficient traffic, we prioritize high-impact changes without testing.
- 02
False Positives
Stopping tests early generates incorrect decisions. Mitigation: mandatory 95% significance, we don't stop even if we see green. Multiple variant correction.
- 03
Optimizing Wrong Metrics
Increasing conversion can decrease revenue if you attract low-value customers. Mitigation: we measure Revenue per Visitor, not just conversion rate. CRM integration for real value.
- 04
Implementation Speed
Unimplemented winners don't generate value. Mitigation: we agree on implementation SLA before starting. We prioritize tests the team can deploy quickly.
Technologies
Technology Stack
Analysis and experimentation tools.
- VWO
- Optimizely
- AB Tasty
- Google Optimize
- Hotjar
- Microsoft Clarity
- GA4
- Amplitude
- Mixpanel
- Looker Studio
- UserTesting
- Maze
- Contentsquare
- FullStory
The proof
Scientific Optimization Specialists
We're not an agency that "runs tests". We've been optimizing conversions for 15 years with rigorous statistical methodology. Every test has documented p-value, calculated sample size, and structured learnings. Fixed fee because we believe in aligning incentives.
- 15+ Years in CRO
- 200+ Tests Run 2024
- 68+ Success Rate
What's included
Why Invest in CRO
Demonstrable value from the first quarter.
- Initial audit: free (funnel analysis + opportunities)
- Quarterly program or monthly retainer based on your goals
- No lock-in: cancellation with 30 days notice
- A/B tool: included or we use yours
- Typical ROI: program recovered with first winning test
- Fixed fee, no percentage of revenue
FAQ
Frequently Asked Questions
What decision-makers ask before hiring.
How much traffic do I need for CRO?
For statistically significant tests: minimum 1,000 conversions/month on the target metric. With less, tests take too long or don't reach significance. Rule of thumb: 10,000+ visits/month. If you're not there yet, combine with SEM campaigns to build volume.
How many tests can you run per month?
Depends on traffic, but typically 2-4 simultaneous tests in different funnel areas. A test takes 2-4 weeks to reach 95% significance. We prioritize by potential impact.
Do you guarantee results?
We guarantee rigorous methodology and statistical validity. Not all tests win (typical rate: 60-70%), but we document learnings from each. ROI comes from cumulative effect.
Why Revenue per Visitor and not Conversion Rate?
You can increase conversion by 50% and lose money if new customers buy low-margin products. RPV captures rate + value. It's the metric that matters to the business.
What happens if a test doesn't reach significance?
We don't declare a winner. An inconclusive test means the difference is too small to detect with your traffic. We document the learning and decide whether to scale the test or move to another hypothesis.
How do you avoid false positives?
Three mechanisms: pre-test calculated sample size, 95% significance minimum, and multiple variant correction. Plus, we validate with segmented analysis.
CRO or complete redesign?
If your website has fundamental UX or technology problems, start with a web redesign. CRO optimizes what already works reasonably. Don't optimize a car without an engine.
Do you work with companies outside Spain?
Yes, we're a CRO agency with 15+ years experience. We work with local, national, and international clients. Video conference meetings available.
Next step
Is Your Website Losing Money to Friction?
Free heuristic audit. We analyze your funnel live and detect the 3 most costly leak points. No commitment.
- No commitment
- Response in 24h
- Custom proposal
Case studies
Projects where we put it to work
Fleurop
Nexus Energía
Circuit de Barcelona-Catalunya
Let's talk.
Initial technical consultation
AI, security and performance. Diagnosis with phased proposal.
- NDA available
- Response <24h
- Phased proposal
Your first meeting is with a Solutions Architect, not a salesperson.
Request diagnosis