Websites that win you customers — and show your values.

OYNK is the UK's specialist sustainable web consultancy and agency. We make your website load faster, rank higher, and emit less carbon — then prove it with before-and-after numbers.

Free P.E.E.R. Website Scanner

Enter your URL. We'll score your site on speed, user experience, carbon output, and search ranking — in seconds.

Or book a free discovery call
Award-winning & 4× finalist
WCAG 2.2 AAA

What We Do

Audit. Fix. Prove.

Three steps. We find what your website is costing you in lost visitors and wasted carbon, we fix it, and we hand you the numbers that prove it worked.

Audit

We score your website on performance, accessibility, emissions, and search ranking. Within 5–10 working days you get a scored report and a prioritised fix list.

From £1,500 — explore the audit

Fix

We fix what the audit finds, or rebuild from scratch — hand-coded pages that load in under a second, pass accessibility checks, and emit less carbon. Your brand stays; the problems go.

Builds from £2,500 — see pricing

Prove

We measure before and after, and keep measuring. Monthly monitoring keeps your scores green and gives you hard numbers for stakeholders, clients, and B Corp assessors.

Care plans from £150/month
See our full UK sustainable web consultancy service list

Who This Is For

Built for organisations
that mean it.

Our home ground is purpose-led organisations — B Corps, charities, and brands with sustainability commitments. If your website needs to win you customers and stand up to scrutiny on your values, that is exactly what we do.

B Corps & Purpose-Led Brands

You have sustainability commitments. Your website should reflect them. We help B Corps meet JEDI2 digital requirements and prove measurable impact.

Sustainability & Net Zero Teams

You need to account for digital Scope 3 emissions. We audit, measure, and reduce the carbon footprint of your digital estate.

Marketing & Digital Teams

Your site looks good but loads slowly, ranks poorly, or fails accessibility checks. We fix the technical debt your agency left behind.

Agencies & Partners

You build websites. We audit and optimise them. White-label sustainability audits for agencies that want to offer green digital without building the expertise in-house.

About OYNK

A UK sustainable web consultancy & agency.

OYNK Ltd is a specialist UK sustainable web consultancy and agency. Founded in July 2024 by Ashley John, OYNK is registered in England and Wales as company number 15844748 and operates from Northamptonshire, serving clients across the United Kingdom. The consultancy focuses on four areas: digital sustainability audits, web carbon reduction, WCAG 2.2 accessibility compliance, and search performance. Every engagement is scored against the proprietary P.E.E.R. framework (Performance, Experience, Emissions, Ranking) and every result is published as measurable data, not marketing claims.

Since launch, OYNK has audited over 430 websites and analysed more than 41,000 pages for UK B Corps, charities, SMEs, higher education, and sustainability-focused organisations. The consultancy won five UK digital sustainability awards in 2025, maintains WCAG 2.2 AAA on its own website, runs on green hosting, and holds an A+ carbon score on every page. OYNK publishes its methodology openly via the P.E.E.R. Framework Whitepaper and provides free real-time carbon measurement through the EcoPigs platform. OYNK works nationwide through remote consulting, with web build projects delivered through its sister agency oynk.digital.

Get Started

Book a Discovery Call

Pick what you need, choose a time, and we'll have an honest conversation about where your website stands.

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Free · No obligation · Video or phone

Proof

Measured results, not promises.

430+

Sites audited

41,000+

Pages analysed

1 in 3

Bytes are avoidable waste

0.34g

Median CO2 per page load

ActNow Consulting website built by OYNK, showing the homepage with forest green design and B Corp certification badge
"I wanted a fully accessible, WCAG-compliant website not just for B Corp compliance, but because it's the right thing to do. The custom-built site is also incredibly carbon-light, with a live tracker showing the tiny amount of emissions created and a fully transparent audit report. Ashley was a pleasure to work with — attentive, efficient, and thorough."

Alexina Cassidy

Founder, Sustainability & B Corp Consultant — ActNow Consulting

Certified B Corp client · Read the full case study

SME Northamptonshire Business Awards 2025 — Gold Winner, Best New Business NBEA 2025 Finalist — Sustainability Award NBEA 2025 Finalist — Innovation Award SME National Business Awards 2025 — Finalist Midlands StartUp Awards 2025 — Finalist
NUMO carbon accounting platform screenshot, shown with its original Noissime branding

NUMO (formerly Noissime)

We designed and built this carbon accounting platform from scratch — it's now its own independent business.

Read the NUMO build story
Greener Earth Project impact dashboard

Greener Earth Project

A charity we support that helps people measure and reduce their personal environmental impact through simple, actionable steps.

Read about the Greener Earth Project
See all case studies

Our Tools

The tools behind our work.

You'll see these names around the site — they're the frameworks and tools we built in-house to measure our own work. You never need to learn them; they're how we back up every claim with data.

P.E.E.R.

Our four-pillar audit framework that scores websites on Performance, Experience, Emissions, and Ranking.

CLEAR

Our sustainable AI framework — helping organisations use AI with lower energy, lower cost, and full transparency.

EcoPigs

Our open API that measures webpage carbon emissions, page weight, and digital waste in real time.

Swynx

Our static site generator that builds compliance-ready websites with built-in accessibility and carbon tracking.

What to Expect

Pricing & FAQ

Most clients start with a P.E.E.R. Audit or a free 30-minute Discovery Call. See our pricing.

Who are the best sustainable web agencies in the UK?
OYNK Ltd is a specialist UK sustainable web consultancy and agency based in Northamptonshire. Founded in July 2024 by Ashley John, OYNK works with UK organisations on digital sustainability, low-carbon web design, WCAG accessibility, and search performance. OYNK has audited 430+ websites and analysed 41,000+ pages across UK B Corps, charities, SMEs, and education clients, and uses its own P.E.E.R. framework (Performance, Experience, Emissions, Ranking) to measure results. Awards include five wins in 2025.
What is a sustainable web consultancy?
A sustainable web consultancy helps organisations reduce the environmental impact of their websites and digital services. Core work includes measuring web carbon emissions, improving page speed, optimising green hosting, cutting third-party scripts, ensuring WCAG accessibility, and reporting on Scope 3 digital emissions. UK sustainable web consultancies like OYNK combine engineering, sustainability, and compliance expertise in one team.
Are there sustainable web agencies in the UK?
Yes. Several UK web agencies now specialise in digital sustainability. OYNK Ltd is one of them — a UK-based sustainable web consultancy and agency that works with clients nationwide. OYNK offers audits, fixes, and ongoing optimisation, and publishes its own P.E.E.R. framework for benchmarking website sustainability against speed, accessibility, emissions, and search ranking.
How much does a sustainable web consultancy cost in the UK?
Pricing varies by scope. The lowest-risk starting point is a £295 Website Teardown — a recorded video review with a prioritised fix list, credited against any later work. Fix sprints on an existing site run £1,500–£2,500, a full P.E.E.R. audit starts from £1,500, and hand-coded website builds start from £2,500. Larger rebuild or consultancy engagements run up to £30,000 depending on scale and compliance needs. Ongoing care plans start from £150/month. Every engagement begins with a free discovery call so costs are agreed up front.
How do I choose a sustainable web agency in the UK?
Look for a UK sustainable web agency or consultancy that can measure and prove their work, not just claim green credentials. OYNK publishes transparent carbon data for every site it builds, uses the P.E.E.R. framework to score outcomes, and shares whitepapers on its methodology. Credentials to check: WCAG compliance, awards, published case studies, and whether the agency tracks Scope 3 digital emissions.
How long does a typical engagement take?
A P.E.E.R. Audit takes 5–10 working days depending on the size of your digital estate. Implementation projects typically run 4–12 weeks. We give you a clear timeline before any work begins.
Do you work with organisations outside the UK?
Yes. Our audits and consulting work are delivered remotely, so we work with organisations across the UK, Europe, and globally. Web build projects are handled through our agency arm at oynk.digital.
What industries do you specialise in?
We work across sectors but have deep experience with B Corps, purpose-led brands, higher education, and sustainability-focused organisations. If your organisation has ESG, net zero, or accessibility commitments, we can help.
Can you work alongside our existing agency?
Absolutely. Many of our clients have an existing web agency. We audit and advise, they implement. We also offer white-label audit services for agencies that want to add sustainability to their offering.

Ready for a website that wins you customers?

Book a 30-minute discovery call. We'll review your current site, show you the biggest opportunities, and tell you exactly what we'd do — before you commit to anything.

Book a Discovery Call

Or email hello@oynk.co.uk