eCommerce conversion optimization services

If you’re running an eCommerce business and putting money into traffic (organic, paid, social, email), then you’ve already felt the pain of wasted spend when that traffic doesn’t convert. That’s where conversion rate optimization (CRO) comes in — the process of improving your site so more visitors take action that ultimately lead to increased sales.

Agencies offer a range of CRO services tailored to eCommerce brands, but the landscape is messy. Some promise the moon and deliver slide decks. Others are execution-focused and plug directly into your tech stack. This article breaks down the common service types, who they help, and how agencies typically charge.

Types of eCommerce CRO services

CRO audits

What it is: A one-time assessment of your site and funnel. Agencies analyze user behavior, identify friction points, and recommend fixes.

What you get:

• Heuristic evaluations

• GA4 / Clarity / Hotjar data analysis

• UX/UI feedback

• Prioritized list of optimization opportunities
  Best for: Stores with traffic but inconsistent performance or drop-offs at key funnel stages.

A/B testing & experimentation

What it is: Systematic testing of site variations to see what improves conversion.

What you get:

• Hypothesis development

• Test design and deployment

• Statistical analysis of results

• Iterative testing cycles
  Best for: Mid-to-large brands with 10k+ monthly sessions and a consistent flow of transactions. Without enough traffic, test velocity is too low to be meaningful.

Landing page optimization

What it is: Focused work on key product, collection, or campaign pages to drive specific outcomes.

What you get:

• Wireframing and copywriting

• Design mockups or dev-ready assets

• Implementation support or direct execution
  Best for: Brands running paid media, seasonal campaigns, or launching new SKUs.

Full-service ongoing CRO

What it is: A retainer-based partnership where the agency handles everything from research to testing to implementation.

What you get:

• Analytics setup and maintenance

• Heatmaps, session recordings, scrollmaps

• Test roadmaps and reporting

• Creative and dev resources (depends on agency)
  Best for: Growth-stage brands doing $1M–$30M/year who want CRO as a function but don’t have the in-house team to run it.

Who these services help

If you don’t have 1,000+ monthly conversions or meaningful traffic, classic A/B testing won’t be statistically valid. But qualitative improvements, from usability tweaks to better messaging, can still move the needle.

How Agencies charge for CRO

There are three main pricing models:

Fixed-fee project

• Common for audits, redesigns, or single-page optimization

• Price: $2,000–$10,000 depending on scope

• Pros: Predictable, clear deliverables

• Cons: No iteration or long-term testing
  

Monthly retainer

• For ongoing optimization, testing, and support

• Price: $3,000–$15,000/month based on traffic, complexity, and deliverables

• Pros: Continuous improvement, dedicated team

• Cons: Costly if your traffic is low or results aren’t guaranteed
  

Performance-based (revenue share)

• Agency takes a % of revenue uplift or conversion lift

• Price: 10%–30% of incremental gains (audited monthly/quarterly)

• Pros: Skin in the game; aligned incentives

• Cons: Hard to track clean attribution; usually combined with base fee