CRO Agencies in Wales: Cardiff’s Top Options (2026)

Wales has CRO work, but most of it happens in-house. Recent Cardiff job ads from Legal & General and Typeform were for CRO and web optimisation roles inside those companies, not at agencies.

We searched Cardiff, Swansea and Newport for agencies showing a Welsh address and explaining CRO on their own website. Two passed, both in Cardiff.

This page covers those two in detail, explains what we found in each city, and shows where Welsh businesses can look next.

Which Welsh CRO agency suits you?

The two CRO agencies we could confirm in Wales in 2026 are Box UK and Spindogs, both based in Cardiff.

• Membership bodies and enterprise platforms: Box UK, Greyfriars Road
• A fixed-price conversion audit: Box UK, from £5,000
• CRO inside a full digital partnership: Spindogs, Cardiff Bay

CRO agencies by city in Wales

Each city got the same check: a local address on the agency’s own site and a CRO service it explains.

Cardiff

Cardiff is the only Welsh city where we confirmed CRO agencies. Several others there, including paid media and web design studios, list CRO in directories but not on their own sites.

Swansea

We found no Swansea agency with a CRO service on its website. The local results were mostly out-of-town pages targeting the city.

Newport

Newport returned the same picture: no confirmed local CRO agency, though it sits closest to the Bristol options covered below.

Box UK and Spindogs compared

Box UK publishes a fixed fee for its conversion audit. Spindogs quotes after a first conversation.

The 2 CRO agencies we found in Wales

Each profile covers how the agency handles CRO, one proof point from its own site, and the kind of business it suits.

1. Box UK: Platform CRO

Box UK started in Cardiff in 1998 and builds and runs digital platforms from Cardiff and London.

Its CRO service maps leak points in journeys, then runs A/B and multivariate tests in VWO, where it is a trusted agency partner.

Proof point: For a global retailer, a personalised cross-sell feature it built now brings in 5% of revenue. Its homepage names BBC, Just Eat, the National Trust and the Welsh Government among its clients.

Consider them if you run a membership site, professional body or large platform and want testing from the team that can also build the changes.

2. Spindogs: Digital Partner

Founded in Cardiff in 2004, Spindogs describes itself as Wales’ largest digital transformation agency, with its base on Havannah Street in Cardiff Bay. Its UX consultancy uses heatmapping and A/B testing to trial changes to interfaces and journeys.

Proof point: It has grown through acquisitions, including Unified Digital Solutions and Pembrokeshire’s United Studios, and also works from an Oxford office.

Consider them if you want CRO handled by the same team that runs your website, SEO and paid media.

Why Welsh firms keep CRO in-house

Large Cardiff employers have built their own optimisation teams. That shapes what smaller businesses should do.

• Big brands hire specialists. Legal & General advertised for a CRO specialist in its Cardiff conversion team, and Typeform for a web optimisation lead.
• Smaller firms rarely can. A single CRO hire needs steady traffic and developer time to be worth the salary.
• An audit is a middle path. A fixed-price review shows where visitors drop off before you commit to a hire or a retainer.
• Testing needs volume. On low-traffic pages, user research and quick fixes usually beat waiting weeks for A/B tests to finish.

Looking across the Severn

Bristol is under an hour from Cardiff by train and has a deeper bench of CRO agencies.

• Five confirmed Bristol agencies. Our CRO agencies in Bristol guide covers paid media, B2B and brand-led options.
• More choice across England. The CRO agencies in England hub lists ten agencies and two published prices.
• Remote work is normal. Most CRO programmes run on shared dashboards and calls, so distance matters less than fit.

WiserNotify publishes this guide. Recent-purchase alerts and live visitor counts are simple trust signals a Welsh business can test on its own product or enquiry pages.

Wrap Up

Choose Box UK for a fixed-price audit or platform-level work, and Spindogs for CRO bundled with a wider digital partnership. For more options, look to Bristol.

Comparing internationally? Our global roundup of CRO agencies covers other countries.

Running a business in Northern Ireland? See CRO agencies in Northern Ireland.

All four nations side by side: UK CRO agencies.