HAAM Web Sustainability Audit

Measure the waste before calling a website green.

Audit a public webpage for transfer weight, image and media efficiency, JavaScript overhead, caching, compression, third-party dependencies, green hosting evidence, and resilient delivery. Every result shows what was measured, what remains unknown, and what to reduce first.

Run an auditBook the full audit

Audit input

The server reads one public HTML page and probes a bounded set of referenced assets. Private-network addresses are blocked. The tool does not execute page JavaScript or claim full lifecycle coverage.

What the audit measures

Find the digital waste a page can actually prove.

The report inventories initial resources, measures declared asset sizes, checks compression and caching, estimates transfer emissions, verifies green hosting, and maps fixes to current Web Sustainability Guidelines.

01

Transfer

02

Media

03

Code

04

Delivery

05

Hosting

06

Resilience

Method

A carbon number without evidence is weak design.

The tool uses deterministic checks rather than an AI model. It measures what a server can observe safely, states coverage, and keeps the emissions estimate separate from the actionable findings.

  1. 01

    Measure

    Read one public HTML page and collect a bounded inventory of its initial resources, declared sizes, caching, compression, and hosting evidence.

  2. 02

    Estimate

    Convert measured transfer into a transparent per-visit estimate using Sustainable Web Design Model v4 global-average factors.

  3. 03

    Diagnose

    Identify avoidable waste across media, JavaScript, third parties, delivery, hosting, and resilient cross-device use.

  4. 04

    Reduce

    Rank concrete fixes by severity and map them to the current W3C Web Sustainability Guidelines draft.

Current guidance

Web Sustainability Guidelines

Findings map to the W3C Web Sustainability Guidelines Group Note Draft published on 7 July 2026. The guidelines cover planet, people, and prosperity, so the audit includes resilience and responsible delivery alongside carbon.

Read the W3C draft

Transparent estimate

Sustainable Web Design Model v4

The per-visit estimate uses measured data transfer and the model's global-average operational and embodied factors. It is a useful baseline, not a direct electricity meter.

Review the methodology

Hosting evidence

Green Web Foundation verification

The hostname is checked against The Green Web Foundation dataset. A negative result means green hosting is not verified in that dataset. It does not prove fossil-powered hosting.

See the Greencheck API

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Optional Google Analytics and Microsoft Clarity measure content performance and usability. They load only if you allow them. Form values, email addresses, and chat messages are never included in analytics events.