TLDR: A CRO audit is a structured analysis of your website that combines quantitative data and qualitative insights to identify where conversion issues exist and why they are happening. The result is a clear, prioritised plan to increase conversion rate and drive measurable revenue growth.
Table of Contents
What is a CRO audit?
A CRO audit is the structured evaluation of a website to understand what is actually going on and how it can be improved. It is the starting point and constant foundation of any serious CRO project. At Modo25, a CRO audit is split into two core components:
Quantitative analysis
This is the “where” analysis. It involves diving into analytics platforms such as GA4, Shopify analytics, Adobe Analytics or ASK BOSCO® to understand the numbers.
The quantitative analysis shows:
- Where conversion rates are underperforming.
- Which devices, browsers or channels are struggling.
- Which landing pages are leaking revenue.
- Where users are dropping out of the funnel.
Qualitative analysis
This is the “why” analysis. Heatmaps, click analysis, session recordings and scroll depth tools reveal what users are actually doing on the website.
Quantitative data tells you where it is broken. Qualitative data tells you why it is broken. When you combine the two, you stop guessing and start making commercially informed decisions.
What you need before starting your CRO audit
Before running a CRO audit, you need the right foundations in place.
Reliable analytics data
A quantitative reporting platform is non-negotiable. This could be:
Ideally, you should have access to historical data. At Modo25, we often work with three years of data segmented across timeframes, although that is a “nice to have” rather than mandatory.
Qualitative tools (strongly recommended)
While not always essential, qualitative data significantly increases the value of the audit. Without it, you may know something is wrong, but you cannot pinpoint exactly why.
Business context
Data without context is dangerous. You need to understand:
- Seasonality patterns.
- Peak trading periods such as Black Friday.
- Year-on-year performance trends.
- Website migrations in the last 12 to 24 months.
- Pricing or shipping changes.
- Market expansion, such as entering the US.
- Tracking issues or agency changes.
Business context helps eliminate false conclusions and accelerates insight generation.
Step-by-Step CRO audit process
At Modo25, the CRO audit follows a structured methodology.
Step 1: Export and segment analytics data
We export GA4 data across three timeframes:
- Last 90 days.
- Last 12 months.
- Last three years.
We analyse performance across multiple dimensions, including:
- Device.
- Screen resolution.
- Operating system.
- Browser.
- Channel.
- Landing page.
This segmentation allows us to identify patterns and isolate performance issues.
Step 2: Device and technical performance analysis
We start with device performance. If mobile conversion rate is underperforming, we drill into:
- Operating systems.
- Browser performance.
- iOS or system updates.
- Cookie or tracking issues.
For example, if 90 percent of traffic is mobile but conversion rate is significantly below average, this becomes a priority area. We benchmark performance against Modo25’s client database, which includes thousands of tests, to understand whether conversion rates are aligned with industry norms.
Step 3: Channel and landing page analysis
We evaluate channel performance to identify whether PPC, organic or other traffic sources are under-indexing. We then drill down into landing pages to understand where the weakness originates.
Importantly, we categorise all pages into five tiers:
- Checkout (including cart).
- Product pages.
- Collection pages.
- Priority pages such as homepage and campaign landing pages.
- Headers, navigation and search (HNS).
This structured framework enables us to quickly identify which layer of the site architecture is responsible for underperformance.
Step 4: Funnel analysis
We build custom funnels to analyse how users flow through the website.
This shows:
- Where drop-offs occur.
- Whether users are progressing effectively.
- Whether friction exists in key stages.
Step 5: Qualitative deep dive
Once we know where issues exist, we analyse:
- Click behaviour.
- Scroll depth.
- Session recordings.
- Heatmaps.
For example, low clicks on a high-traffic page might initially look alarming. However, when you factor in bounce rate, the story often changes. This stage transforms assumptions into validated insight.
Step 6: SEO and paid media diagnostics
We also review:
- Organic visibility and performance.
- Google Search Console insights.
- Core Web Vitals.
- Google Ads quality score.
Website speed is one of the biggest contributors to conversion performance. Even small improvements in load time can materially impact revenue.
Prioritising CRO opportunities
Insight without prioritisation creates overwhelm. At Modo25, we use a PIE framework:
- Potential: Based on our database of over 2,500 to 3,000 tests, what is likely to work.
- Importance: How critical is this area based on your own data.
- Ease: How difficult and costly is implementation.
This framework allows us to build a structured CRO roadmap that balances impact with feasibility.
We can also forecast revenue impact. For example, a 10 percent uplift in conversion rate can be modelled against projected traffic to estimate incremental revenue over 12 months.
Tools to use during a CRO audit
A strong CRO audit is tool-agnostic but data-driven.
Analytics platforms
- GA4.
- Adobe Analytics.
- Shopify analytics.
- ASK BOSCO®.
Behavioural tools
- Heatmapping tools.
- Microsoft Clarity.
- Session recording platforms.
UX research tools
- Maze.
- Crowd testing platforms.
- Biometric or eye-tracking studies where required.
SEO and performance tools
- Google Search Console.
- Core Web Vitals diagnostics like SEMrush’s web page score.
- SEMrush.
- Google Ads quality score analysis.
The most important factor is not the tool itself. It is the interpretation of the data.
What to do after the CRO audit
The audit is the starting point. At Modo25, we present findings in detail, often in person, sharing both the data and the context behind it. We clarify anomalies, validate assumptions and answer key business questions.
From there, we:
- Build a prioritised CRO roadmap.
- Forecast expected revenue uplift.
- Define testing timelines.
- Track performance against projections.
Some clients implement internally. Others partner with us to execute continuous A/B testing programmes. In both cases, the audit ensures effort is focused where it will drive the greatest commercial return.
Conclusion
A CRO audit is a structured, data-driven investigation into how your website performs, where it leaks revenue and how to fix it. At Modo25, the CRO audit is the cornerstone of every optimisation project. By combining deep quantitative analysis, behavioural insight, business context and structured prioritisation, we turn complexity into a clear roadmap for growth.
If you want to stop guessing and start scaling conversion performance with confidence, a properly executed CRO audit is the first step. Ready for your expert CRO audit? Explore our CRO services or get in touch with the Modo25 team to start optimising your site today.
