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Discover what makes us different
Our average client sees a 35% lift in conversion rate across 150+ CRO projects.
500+ tests run across landing pages, checkouts and lead capture forms.
Every change is backed by analytics, heatmaps and real session data.
Certified VWO partners running enterprise-grade experimentation programmes.
Here's what sets us apart from the competition
Find answers to common questions
Prebo integrates CRO work with GA4, Google Tag Manager, server-side tracking, and common ecommerce platforms like Shopify and WordPress to ensure accurate event capture and attribution. We also set up ETL or data-layer solutions where needed so test results feed into a single source of truth for decision making.
Common experiments include A/B tests, multivariate tests, funnel experiments, UX and checkout performance optimizations, and technical fixes that reduce friction. Test duration depends on traffic volume and required statistical power but typically ranges from several weeks to a few months per experiment cycle.
We prioritise revenue-per-visitor, conversion rate, average order value, customer acquisition cost (CAC), lifetime value (LTV), and marketing efficiency ratio (MER), alongside statistical significance for experiments. Clean attribution and centralized data pipelines ensure those metrics reflect true business impact rather than platform-reported figures.
CRO is designed to improve conversion efficiency and attribution accuracy, which can increase revenue and profitability when combined with product-market fit and adequate traffic. Outcomes vary by business and depend on test quality, funnel issues identified, and downstream economics, so results are not assured and are measured against revenue-focused KPIs rather than vanity metrics.
CRO is the systematic process of improving a website or funnel to increase revenue per visitor. Prebo Digital uses a technical-first, analytics-driven approach with hypothesis-driven experiments, server-side tracking, and funnel-level optimization focused on measurable revenue outcomes.
In This Article
Define revenue KPIs
Verify technical skills
Pilot with clear baselines
Choosing a website optimization agency is not just about increasing traffic - it’s about improving revenue, lowering CAC, and creating measurable lifts in conversion value. This guide explains how to evaluate agencies on the technical skills, analytics practices, and process maturity that drive profitable growth for Shopify, WooCommerce, and B2B sites in the United States.
Define clear KPIs before speaking with agencies: revenue per visitor (RPV), customer acquisition cost (CAC), lifetime value (LTV), and marketing efficiency (MER). Agencies that default to vanity metrics like sessions or impressions often miss the downstream impact on profitability.
| Event | Client-side | Server-side |
|---|---|---|
| Pageview / Click | Browser JS > Google Tag Manager | Optional server-side collector for deduplication |
| Add to Cart | DataLayer push + GA4 event | Order staged for dedupe and enrichment |
| Purchase | Transaction event | Server-side purchase with hashed identifiers for attribution |
When you ask agencies for case studies, request funnel-level impact (e.g., a 12% increase in BOF conversion leading to a $0.30 increase in RPV) and the attribution method used. Well-documented attribution shows whether lifts were measured via platform pixels, GA4, or server-side pipelines.
For an overview of capabilities you should expect from a technical-first agency, review the agency's service mix and methodology. Start by checking a services overview to confirm they offer analytics, CRO, and development in one workflow: Prebo Digital services. Also validate their positioning and approach on their homepage to ensure alignment with revenue-focused goals: Prebo Digital homepage.
A repeatable process separates strategic vendors from tactical shops. Look for a documented workflow: Strategy → Build → Test → Scale → Report. During initial calls, ask for the role breakdown (analyst, CRO lead, developer, data engineer) and typical retainer length. Agencies that provide long-term, iterative testing and attribution clarity will align better with profitability goals.
In the US market, CRO and technical optimization retainers commonly range from about $3,000 to $15,000+ per month depending on scope and team depth. For example, a growth-focused engagement that includes GA4 server-side tracking, A/B testing, and media integration might start near $5,000/month. These figures are estimates and will vary by agency and project complexity.
In the United States, privacy laws and state rules (e.g., CCPA/CPRA) can affect how you collect and process signals. Confirm that an agency understands consent flows, first-party tracking strategies, and cookie/pixel management to reduce data loss and legal risk.
Start with a 60-120 day pilot: define baseline metrics, agree on test hypotheses, and instrument server-side tracking for revenue attribution. Require weekly reporting that ties experiments to revenue changes and a post-pilot review that defines a scaled roadmap.
If you want to understand the agency's background and team experience before engaging, review their company profile and history: About Prebo Digital. When you're ready to outline scope or request specifics about a pilot, use a structured contact path to share details: Prebo Digital contact.
A 4-person DTC brand on Shopify with $60,000 monthly revenue might engage an optimization agency to increase BOF conversion by running checkout flow tests, server-side deduplication, and targeted CRO hypotheses. If a pilot increases average order value by $6 and conversion rate by 7% (example estimate), the combined revenue impact should be calculated and compared to retainer cost to evaluate payback period.
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