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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
Key cost drivers
Typical US ranges
Budget with ROI focus
If you run a US-based eCommerce store, SaaS product, or service business, the phrase "what are the costs of website optimization services" should lead to a business conversation - not a line-item debate. Website optimization services encompass technical performance work, conversion rate optimisation (CRO), UX adjustments, analytics and tracking, and A/B testing. Each area targets revenue-driving outcomes like higher conversion rates, lower acquisition cost per customer (CAC), and improved lifetime value (LTV) rather than vanity traffic metrics.
Website optimization is not a single task. Typical service categories include:
| Service | Typical US Range | When to expect |
|---|---|---|
| Technical performance audit | $1,000-$6,000 one-time | Small to mid sites; includes Lighthouse, caching, images |
| CRO program (retainer) | $2,500-$15,000+/month | Monthly experiment roadmap, design, dev, analysis |
| A/B test build & analysis | $500-$4,000 per test | Depends on complexity and dev time |
| Analytics & server-side tracking | $1,500-$10,000+ initial | Includes GA4, GTM, server containers, QA |
These are US-focused estimates and should be treated as ranges. Smaller independents may charge at the low end; specialised agencies with data engineers will be at the high end. For a bundled growth program combining CRO, tracking and performance media, monthly budgets commonly start around $6,000-$10,000 for smaller brands.
Choosing the right model depends on whether you want a time-limited project (e.g., speed audit + fixes) or a continuous growth engine that runs hypothesis-driven experiments. Read more about typical agency engagements on the Prebo Digital services page to see how structured retainers are built around measurable outcomes.
Quick note: Budget decisions should start with projected revenue impact. A $5,000 monthly retainer that reduces CAC by 15% or increases conversion rate by 10% can quickly pay for itself in most US eCommerce scenarios.
If you want to assess baseline performance before investing, a lightweight audit or growth audit is often the most cost-effective first step. For an overview of Prebo Digital’s approach to revenue-focused systems, visit our homepage.
Most US agencies use one of three models: fixed-price projects, hourly rates, or monthly retainers. Each has trade-offs:
Below are simplified scenarios with illustrative numbers (estimates):
Treat optimization spend like any marketing investment: estimate expected revenue lift, calculate payback period, and prioritise experiments with the highest expected value. Example: if a $6,000 monthly program is likely to improve monthly revenue by $18,000 (conservative estimate), the payback is under one month. Always note that these figures are illustrative and will vary by industry and funnel.
If you want to compare options quickly, request a growth audit or scope a pilot test to see projected revenue impact before committing to a long retainer. Learn more about how a revenue-focused approach combines analytics, CRO, and paid media on the About Prebo Digital page.
When evaluating proposals, ask for:
If you’re ready to explore a scoped pilot or want a tailored cost estimate, you can request a growth audit to compare projected ROI across prioritized experiments.
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