Every agency here is in Klaviyo's partner directory and has a London base. A few run your Klaviyo week to week, and a few fold it into a wider ecommerce or consultancy brief, so each entry says who it suits.
The shortlist at a glance
| Agency | Good fit for | Klaviyo listing |
|---|---|---|
| Email Kong | Shopify brands that want Klaviyo run every week, especially subscription brands | Master Platinum |
| Enchant Agency | Larger brands that want email, SMS, WhatsApp and loyalty from one CRM team | Master Platinum |
| ElliotDigital | Shopify DTC brands that want email and SMS only | Master Platinum |
| Thrivelia | Brands that want a lifecycle framework and AI-assisted analysis | Master Platinum |
| Unified | Brands on Magento, Shopify Plus or BigCommerce that want a build too | Gold Master |
| Vervaunt | Larger brands that want ecommerce consultancy with Klaviyo strategy | Platinum Advisor |
1. Email Kong
We're a London Klaviyo agency, a 2 minute walk from Klaviyo's London office, working with Shopify brands in the UK and US. We run the whole account: the campaign calendar, design, copy, flows and SMS. Most of our clients sell subscriptions or products people buy again, so we also work inside the subscription app on the cancel flow, failed payments and winback.
We're a Klaviyo Master Platinum Partner, ranked in the top 2.5% of partners worldwide, and a member of Klaviyo's Partner Advisory Council. Over 5 years we've worked with 140+ DTC brands and driven $59M+ in revenue attributed to Klaviyo, and we're rated 4.5 on Trustpilot.
Kaori went from 3.3% to 19% of store revenue coming from Klaviyo. Penrose Skin went from 15.2% to 23.2% while the store more than tripled. At KittySpout, 46% of revenue is attributed to Klaviyo.
Your first flow is live within 72 hours of us getting access, and you get a shared Slack channel, a monthly report and call, and a quarterly call with our founder. Retainers start from $5,000 a month.
Good fit if: you want a senior London team that runs Klaviyo every week and can show the numbers.
2. Enchant Agency
Enchant is a Klaviyo Master Platinum partner with offices in London, Cambridge, Berlin and New York, and its site says Klaviyo named it 2026 EMEA UK & Ireland Partner of the Year. It plans email, SMS, WhatsApp, push and loyalty together, and also partners with HubSpot, Braze and Iterable. Clients include Victorinox, Sealskinz, Cox & Cox, QVC and Hampers.com.
Good fit if: you're a larger brand and want one CRM team across many channels and platforms.
3. ElliotDigital
ElliotDigital is a London email and SMS agency and Klaviyo Master Platinum partner covering strategy, design, copy, automation and segmentation for Shopify and Shopify Plus brands, with free audits. Clients include SURREAL, HUX, Personalised Co and Cornelia James.
Good fit if: you're a Shopify brand and only want email and SMS.
4. Thrivelia
Thrivelia is a Klaviyo Master Platinum partner with a remote team split between London and Sofia. It works to its own framework, the Marketing Hourglass, personalises by order count and uses Klaviyo's MCP and Claude for analysis. Clients include KEF, Carnivore Snax, Ouidad and Pulsetto.
Good fit if: you like a defined framework and AI-assisted reporting.
5. Unified
Unified is a London ecommerce agency and Klaviyo Gold Master partner that does strategy, development, design, Klaviyo data and analytics, SEO and paid media. Clients include Tom Dixon, Boodles, Flying Tiger, The Conran Shop and iCandy.
Good fit if: you're on Magento, Shopify Plus or BigCommerce and want the store build and Klaviyo from one agency.
6. Vervaunt
Vervaunt is an ecommerce consultancy at 10 Devonshire Square, London, and a Klaviyo Platinum Advisor partner. It does audits, replatforming and performance marketing for brands of $10M to over $500M a year. Clients include Represent, Stussy, Fred Perry, Mulberry and A.P.C.
Good fit if: you're a larger brand and want consultancy and replatforming with Klaviyo strategy in the brief.
How to choose
- Do you need meetings in person, or are UK hours enough?
- Is the agency a Klaviyo Master partner, who runs the account for you, or an Advisor, who mostly advises and refers?
- Who actually does the strategy, copy, design and builds?
- Can they show Klaviyo's share of store revenue before and after, with dates?
- If you sell subscriptions, will they work inside your subscription app?
For fees, see our Klaviyo agency pricing guide. If you sell subscriptions, read our guides to a subscription retention agency and a Loop Subscriptions agency.
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Sources
- Email Kong: Klaviyo directory
- Enchant Agency: Klaviyo directory, website
- ElliotDigital: Klaviyo directory, website
- Thrivelia: Klaviyo directory, website
- Unified: Klaviyo directory, website
- Vervaunt: Klaviyo directory, website
- Klaviyo partner tracks and tiers: Klaviyo Academy
