Table of contents
How we vet every listicle
Every agency featured on Web Tonic passes our 84-point editorial review before a single listicle goes live. This is how we vet each pick:
Verified client outcomes: We require real case studies with measurable KPIs — revenue, ROAS, CPA, retention — tied to the exact category being ranked. No cherry-picked wins, no unverifiable numbers.
Independent reputation: We cross-check Clutch, Google, G2, and Trustpilot ratings, and screen for review-bombing or suspicious patterns. Only operators with a consistent, verifiable track record make the cut.
Beyond that, every listing goes through a quarterly re-audit. We check 84 criteria across 6 pillars to make sure it still holds up — here are some of the checks we run:
A marketing analytics agency builds and maintains the measurement layer underneath a company's marketing: Google Analytics 4 and Tag Manager implementation, conversion and event tracking, consent-aware and server-side collection, attribution modelling, and the reporting that turns all of it into a number an owner can act on.
Eleven Cardiff agencies passed our evidence check on published claims about analytics, tracking, tag management or attribution. Ten publish a Cardiff address and Atomic Digital Marketing sells in from Warrington. Three name clients, from Keep Wales Tidy at Hello Starling to Auditel at Appear Online, and none of them publishes a rate we could verify on its own site.
Are Cardiff marketing analytics agencies based in Cardiff?
Ten of the eleven external agencies on this page publish a Cardiff address; only Atomic Digital Marketing answers from Warrington. Three of the eleven name a client on their own site, and none publishes a rate we could verify.
1. Web Tonic
About: Web Tonic runs analytics inside one data programme, so the tracking plan, the dashboards and the attribution are built against the same targets as the paid search and the organic work, and every number lands in one growth programme. Cardiff accounts are frequently a single site with one form and one phone line, so we cut the reporting back to the handful of events that decide the month rather than shipping a forty-widget dashboard nobody opens. A company that only needs a one-off container audit will be well served by several of the specialists below.
Key Services: Growth Marketing, Paid Social, PPC, Meta Ads, SEO, Google Ads, Snapchat Ads, Amazon Ads, Reddit Ads, TikTok Ads, TikTok Shop, GEO-AEO, Webflow Design, Shopify Design, WordPress Design, UGC, Social Media Management, Pay Per Click Management, Marketing Analytics, Analytics Implementation & CDPs, Performance Branding, Performance 360° Audit, Programmatic Ads, OOH Ads, HR Marketing
Industries Served: eCommerce, SaaS, B2B, Construction Professionals, Home Services, SMEs, Health Spa & Wellness, Retail, Legal & Judicial Services, Food & Beverages, Pets, Fitness, Family & Children, Finance & Insurance, Travel, Non-Profits & Organizations, Furniture & Decoration
Notable Clients: WorldRemit, Jack & Jones, Ardene, L’Oréal, Sendwave, Nestlé, Airbnb. Serve Fortune 500 companies and smaller fast-paced startups.
Locations: HQ in San Francisco with notable offices in New York, Chicago, Miami, Toronto, Montreal, Dubai, Singapore, Sydney and more. Offices on five continents.
Pricing: Starting at USD $3,000 per month. Flexible and scalable plans at any time according to your enterprise needs. Book a call to learn more.
Great For: Mid-market to enterprise-level businesses requiring ongoing, on-tap growth and performance marketing services.
Website: Web Tonic
2. Appear Online
About: Appear Online is a Cardiff-based search marketing and SEO agency that helps local and national businesses improve their organic visibility on Google and AI platforms. They measure campaign performance using live Google Search Console and GA4 data to tie visibility directly to commercial revenue.
Key Services: Search Engine Optimisation (SEO), Local SEO, AI/LLM Optimisation (AIO/GEO), Google Ads Management, Link Building, Content Marketing
Industries Served: eCommerce, Legal, Dental, Construction, Estate Agents
Notable Clients: No. 86 Estate Agents, Lost Loom, blue self storage, Anavrin, Creative Spaces Design, Auditel, Groova Juice
Locations: Cardiff
Pricing: Quote-based
Great For: eCommerce advertisers, Legal advertisers, Dental advertisers
Website: Appear Online
3. Atomic Digital Marketing
About: Atomic Digital Marketing is a multi-award-winning digital marketing and web development agency headquartered in Warrington with additional offices in Cardiff, Southampton, and Edinburgh. They offer full-funnel digital marketing strategies combining SEO, paid media, web design, and digital consulting analytics.
Key Services: Digital Marketing, SEO, PPC, Social Media Marketing, Web Design, Web Development, Digital Consulting, Analytics
Industries Served: Not stated on the firm's own site
Notable Clients:
Locations: Warrington
Pricing: Quote-based
Great For: Advertisers buying digital marketing, Advertisers buying seo, Advertisers buying ppc
Website: Atomic Digital Marketing
4. Caffeine Marketing
About: Caffeine Marketing is a digital marketing agency founded in Cardiff that provides integrated services including SEO, PPC, social media, and web design. They work with businesses across multiple sectors to build strategies focused on commercial growth and lead generation.
Key Services: SEO, Google Ads / PPC, Social Media Marketing, Content Marketing, Website Design
Industries Served: Not stated on the firm's own site
Notable Clients:
Locations: Cardiff
Pricing: Quote-based
Great For: Advertisers buying seo, Advertisers buying google ads / ppc, Advertisers buying social media marketing
Website: Caffeine Marketing
5. Pxa Marketing
About: Pxa Marketing is a performance-driven digital agency based in Cardiff that combines web design, SEO, and data-backed digital marketing. They provide clear, actionable insights into digital performance metrics and utilize data analytics to deliver measurable return on investment.
Key Services: Digital Strategy, Search Engine Optimisation, Google Ads, Meta Ads, LinkedIn Ads, Social Media, Content Marketing, Data Analytics & Reporting, Web Design
Industries Served: SMEs, B2B brands, Non-profits
Notable Clients:
Locations: Cardiff
Pricing: Quote-based
Great For: SMEs advertisers, B2B brands advertisers, Non-profits advertisers
Website: Pxa Marketing
6. Lumen SEO
About: Lumen SEO is a transparent SEO agency based in Cardiff providing straightforward search engine optimization services for small and medium-sized businesses. They specialize in ethical, results-driven SEO campaigns with flexible hourly billing and regular reporting.
Key Services: SEO, Search Engine Optimisation, SEO Audits, SEO Coaching and Workshops
Industries Served: B2B, B2C, Hospitality, Non-profit, Real Estate, Health and Wellbeing
Notable Clients: Yolk Recruitment, Cheeky Wipes, Tramshed Tech, Cwtch Haus, Credas
Locations: Cardiff
Pricing: Quote-based
Great For: B2B advertisers, B2C advertisers, Hospitality advertisers
Website: Lumen SEO
7. Marketing Purks Limited
About: Marketing Purks Limited is a marketing agency based in Cardiff providing bespoke marketing solutions, social media management, web development, and detailed analytics data reporting to help businesses grow. Their client-centric approach focuses on building customized strategies aligned with specific business goals and objectives.
Key Services: Marketing Strategy, Social Media Management, PPC / Google Ads, SEO, Web Development, Design & Creative, Analytics Data Reporting
Industries Served: Trades, Hospitality, Third Sector / Charities
Notable Clients:
Locations: Cardiff
Pricing: Quote-based
Great For: Trades advertisers, Hospitality advertisers, Third Sector / Charities advertisers
Website: Marketing Purks Limited
8. Station Rd. Marketing
About: Station Rd Marketing is a strategic marketing and communications agency based in Cardiff. They focus on delivering insight-led marketing solutions, managing reputations, and implementing tested marketing technology stacks to drive business impact.
Key Services: Strategic Marketing, Communications, Digital Strategy, Marketing Tech Stacks, PR and Campaigns
Industries Served: Not stated on the firm's own site
Notable Clients:
Locations: Cardiff
Pricing: Quote-based
Great For: Advertisers buying strategic marketing, Advertisers buying communications, Advertisers buying digital strategy
Website: Station Rd. Marketing
9. Digital Marketing Wales
About: Digital Marketing Wales provides website design, social media advertising, Google Ads, SEO, and online marketing solutions for small and medium enterprises. Operating as independent digital media advisors, they focus on understanding client needs to build long-term, performance-driven marketing relationships.
Key Services: Website Design, Social Media Advertising, Google Ads, SEO (Search Engine Optimisation), Call Tracking, Reputation Monitoring, Online Marketing Strategy
Industries Served: Not stated on the firm's own site
Notable Clients:
Locations: Cardiff
Pricing: Quote-based
Great For: Advertisers buying website design, Advertisers buying social media advertising, Advertisers buying google ads
Website: Digital Marketing Wales
10. Hello Starling
About: Hello Starling is an award-winning media planning and buying agency based in Cardiff. They focus on data-backed strategies to ensure campaigns deliver measurable, results-driven outcomes.
Key Services: Media Planning, Media Buying, Digital Advertising, Social Media Advertising, Data and Insight Analysis
Industries Served: Travel & Tourism, Finance & Mortgage, Non-Profit & Charity, Sports, Higher Education
Notable Clients: William Raveis Mortgage, Catch the Breeze Retreats, Keep Wales Tidy
Locations: Cardiff
Pricing: Quote-based
Great For: Travel & Tourism advertisers, Finance & Mortgage advertisers, Non-Profit & Charity advertisers
Website: Hello Starling
11. ThisIsUs.Digital
About: ThisIsUs.Digital is a Cardiff-based digital marketing agency focused on supporting SMEs with affordable and bespoke digital marketing solutions. They bring data to the forefront of their activity, ensuring all campaigns are measured against forecasted ROI goals and performance data.
Key Services: Amazon Advertising, PPC, Training, Video Advertising, Programmatic Display, Paid Social
Industries Served: Not stated on the firm's own site
Notable Clients:
Locations: Cardiff
Pricing: Quote-based
Great For: Advertisers buying amazon advertising, Advertisers buying ppc, Advertisers buying training
Website: ThisIsUs.Digital
12. Lunax Digital Marketing
About: Lunax Digital Marketing is a full-service creative and digital marketing agency based in Cardiff, Wales, focusing on data-driven marketing campaigns and revenue-increasing advertising solutions. They specialize in multi-channel digital strategies including SEO, PPC, social media management, and content creation to drive business growth.
Key Services: Digital Marketing, SEO, PPC, Paid Social Media, Email and SMS Automations, Website Creation, Content Creation, PR Campaigns
Industries Served: Not stated on the firm's own site
Notable Clients:
Locations: Cardiff
Pricing: Quote-based
Great For: Advertisers buying digital marketing, Advertisers buying seo, Advertisers buying ppc
Website: Lunax Digital Marketing
Quick Comparison Table
| Agency | Key Specialty | Starting Price | Best For |
|---|---|---|---|
| 1. Web Tonic | Full-Service Performance Marketing | USD $3,000/mo | Mid-market to Enterprise |
| 2. Appear Online | Search Engine Optimisation (SEO) | Quote-based | eCommerce advertisers |
| 3. Atomic Digital Marketing | Digital Marketing | Quote-based | Small and mid-sized advertisers |
| 4. Caffeine Marketing | SEO | Quote-based | Small and mid-sized advertisers |
| 5. Pxa Marketing | Digital Strategy | Quote-based | SMEs advertisers |
| 6. Lumen SEO | SEO | Quote-based | B2B advertisers |
| 7. Marketing Purks Limited | Marketing Strategy | Quote-based | Trades advertisers |
| 8. Station Rd. Marketing | Strategic Marketing | Quote-based | Small and mid-sized advertisers |
| 9. Digital Marketing Wales | Website Design | Quote-based | Small and mid-sized advertisers |
| 10. Hello Starling | Media Planning | Quote-based | Travel & Tourism advertisers |
| 11. ThisIsUs.Digital | Amazon Advertising | Quote-based | Small and mid-sized advertisers |
| 12. Lunax Digital Marketing | Digital Marketing | Quote-based | Small and mid-sized advertisers |
Frequently Asked Questions
Which Cardiff firms name the clients they measure for?
Three of the eleven. Appear Online credits No. 86 Estate Agents, Auditel, Blue Self Storage, Anavrin and Groova Juice, Lumen SEO credits Yolk Recruitment, Cheeky Wipes, Tramshed Tech and Credas, and Hello Starling credits Keep Wales Tidy and Catch the Breeze Retreats. The other eight publish no client names at all, so ask them for two contactable references and ask whether measurement was actually in scope.
Our conversions are phone calls, not online sales. What changes?
Everything about how the number is produced. A call that starts on the website and closes on the phone is invisible to Google Analytics unless call tracking is wired in and the outcome is written back. Ask each firm which call tracking platform it uses, how a call that turned into a sale is separated from a wrong number, and who reviews the recordings when the two systems disagree.
We inherited a GA4 setup we do not trust. Where should an agency start?
Google Analytics runs on 47.6% of all websites, so almost every engagement starts inside an account somebody else configured years ago. A useful first deliverable is an audit that lists every event currently collected, which ones are duplicated, which fire on page load rather than on a real action, and which key events were never marked as conversions. Ask for that document before any dashboard is designed, and ask what will be deleted rather than only what will be added.
What does analytics work cost in Cardiff?
None of the eleven publishes a rate we could verify on its own site. Ask each shortlisted firm to price the audit, the implementation and the ongoing reporting as three separate lines against one identical brief. That matters here because the bench runs from SEO consultancies to media planners, and both will describe measurement work in the same words while quoting for very different amounts of it.
Do consent rules change what we can measure?
Google Tag Manager sits on 45.5% of all websites and holds 99.6% of the tag manager market, which is why most audits begin in a container nobody has documented. Consent Mode and a properly configured banner decide whether a tag fires at all, so a container that ignores consent will either under-report traffic or collect data you should not hold. Ask how consent state reaches the container, whether modelled conversions are labelled as such in your reports, and who reviews the banner when the site changes.
Choosing a Marketing Analytics Agency in Cardiff
Ten of eleven are Cardiff firms. Only Atomic Digital Marketing works the city from Warrington, which we have named rather than folding it into the local count.
Three name a client. Auditel at Appear Online, Credas at Lumen SEO and Keep Wales Tidy at Hello Starling are the checkable references on this bench, so the other eight should expect to be asked for two each.
Decide what a conversion is before the first report. In a market where the phone still closes the sale, a dashboard that counts only online forms will quietly rank your worst channel first.
Nobody publishes a verifiable rate. Price the audit, the implementation and the ongoing analysis separately against one brief, and keep the GA4 property and the container in your own name. If you would rather have the measurement, the paid search and the growth programme reporting to one number, read our latest analysis or see how we work in Cardiff.
