Get a free, expert assessment of your website's digital sustainability or go deeper with a fully measured carbon and performance report, built on your own real data.
Tier 1 · Free
The Free Website Assessment
An AI-powered, evidence-based assessment of your website's digital sustainability and effectiveness, based entirely on what's publicly visible on your site, at no cost.
15 categories assessed, covering business effectiveness, user experience, technical implementation and digital sustainability
A clear executive summary, key findings, strengths and opportunities
Free: no analytics access or commitment required
Free reports are for a website's own owner or staff, so you'll need an email address at your website's domain.
The paid, in-depth follow-on to Tier 1: real measured data from your own Google Analytics 4 and a live PageSpeed test, combined with Web Zero's Website Audit Methodology to calculate your website's actual carbon footprint, plus a prioritised, evidence-based plan to reduce it.
This level of detail -- real, measured data down to the gram -- is what a Tier 2 Digital Carbon Website Impact Assessment gives you; the free Tier 1 assessment doesn't measure emissions this way.
Sample report data
Where a visit's emissions are physically produced, per Web Zero's industry-aligned calculations:
Device54%
Network24%
Datacentre22%
Benefits summary
What you get
Evidence-based, not generic. Every finding traces to a real, cited data source
A defensible methodology (Web Zero's Website Audit Methodology, DESNZ, Green Web Foundation) you can stand behind
A prioritised action plan, not just a score
Better performance and lower carbon, together
A free follow-up assessment to prove the improvement
A free “re-assessment” is included
As a Tier 2 client, you are eligible for a completely free follow-up assessment designed to highlight the improvements to your website once the recommendations have been implemented.
Annual subscription service
Want to keep an eye on your website's emissions over 12 months? No problem. With our subscription plan, we'll analyse your website every month and send you a report highlighting changes covering 9 specific metrics.
Also from Web Zero
Carbon Shrinker
Once your audit shows how heavy your pages are, smaller files are a practical place to start. Carbon Shrinker is a browser-based file compression platform for your whole organisation, with video, image, PDF, document and audio compression that runs on each person's own device.
