London (103 Farringdon Road, EC1R, on its website and as its Companies House registered office); Clutch lists Beenham, Berkshire as headquarters
Best for: Larger DTC brands that want an agency to act as their CRM arm, running Klaviyo email, SMS and WhatsApp alongside in-house staff
A Klaviyo-focused retention and email agency for fast-growth DTC brands that runs CRM audits and roadmaps, retention strategy, creative, automations and flows, and SMS and WhatsApp. It says it is part of supergroup, a network of performance marketing agencies, and has more than 100 team members.
- Klaviyo named Underground Ecom one of three Agency Partners of the Year for EMEA (with EmailClub and MAILODY) in its 2025 K:Partners Awards.[6]
- Klaviyo's partner directory lists it at the Elite Master tier, serving brands from $1M to $500M+ in annual revenue across apparel and beauty, food and beverage, home and subscriptions, and its listing says it has worked with AG1, Huda Beauty, Chilly's, Oh Polly and Wild.[7]
- Companies House lists Underground Ecom Ltd as an active private company incorporated in September 2018, with a London EC1R registered office and the advertising agencies SIC code; its website footer gives the same Farringdon Road address.[8][9]
- Its Clutch profile shows no client reviews yet and puts its service focus at 100% email marketing for ecommerce businesses, with a $5,000+ minimum project size.[10]
London, with teams in Dubai and Auckland
Best for: DTC brands that want retention judged on second-purchase rate, repeat contribution and cohort LTV, and planned with paid acquisition rather than in isolation
A growth marketing agency founded in 2022 with a team in London. Its own pages say that for DTC brands it segments buyers by first product, order timing and likely next need, builds email and SMS journeys from confirmation through replenishment and reactivation, and tests timing, content and incentives by cohort with holdouts where practical.
- MxD Digital says it was founded in 2022 and has teams in London, Dubai and Auckland.[1][2]
- Its DTC retention page names second-purchase rate, time to repeat order, repeat contribution, unsubscribes and cohort LTV as the measures, and warns that email-attributed sales alone can overstate results.[4]
- Its DTC page lists welcome, post-purchase, replenishment, win-back, VIP and loyalty flows, and says lifecycle performance is judged on cohort movement, repeat-purchase curves, holdout tests and incrementality rather than attribution credit alone.[3]
- This description is self-reported from MxD Digital's own website; it says engagement pricing is published in the proposal, fixed for the duration, and quoted against scope.[5]
London (WC1), with a remote team working GMT hours
Best for: Premium beauty, fashion and wellness DTC brands that want a specialist Klaviyo team for flows, loyalty and win-back
An email and retention agency for DTC brands that runs CRM audits, lifecycle flows, email, SMS, WhatsApp and RCS, push notifications, loyalty, subscription and referral journeys, and optimisation and analysis. It names REFY, Daniel Wellington, Grown Alchemist and Real Science Athletics among its clients.
- Clutch shows a 5.0 rating from two verified reviews. REFY's Senior CRM & Loyalty Manager (reviewed March 2026) describes journey mapping, flow optimisation, a win-back strategy and a loyalty launch, reporting post-purchase flow revenue up 187% and loyalty sign-ups up 24.9%.[13]
- Klaviyo's partner directory lists Melusine Studio at the Platinum Master tier, with case studies for Gigi & Olive, Ninepine, Real Science Athletics and Lily & Bean and a testimonial from REFY's Senior CRM/CX Manager.[12]
- Its own site gives a London WC1 location and lists lifecycle marketing covering flows, loyalty, subscriptions and referrals.[11]
London (primary location in Klaviyo's partner directory); its own website publishes no address
Best for: Shopify DTC brands that want a small specialist team to run Klaviyo email and SMS strategy, design and copy
A retention marketing agency for DTC ecommerce brands covering email and SMS strategy, optimisation, design, automation, segmentation and copywriting on Klaviyo and Shopify. Its testimonials come from SURREAL, Magic Mind, Days Brewing, PÄRLA and HUX.
- Klaviyo's partner directory lists ElliotDigital at the Platinum Master tier with London as its primary location and Shopify and Shopify Plus expertise, and carries a testimonial from SURREAL's co-founder describing the agency as an extension of the team since launch.[14]
- Its website describes a full-stack retention team for DTC brands and quotes HUX's co-founder saying it helped the brand reach 50% of revenue through Klaviyo, a figure the agency publishes rather than one independently verified.[15]
London (Clutch lists 7 Hatchers Mews, SE1 as headquarters, plus New York); its website gives no street address
Best for: Subscription and replenishment DTC brands on Shopify Plus whose retention depends on Recharge subscriptions, Klaviyo and the store experience together
A Shopify Platinum Partner agency founded in 2019 that builds and optimises Shopify Plus stores and runs email and SMS on Klaviyo and subscriptions on Recharge. Its Clutch profile puts 70% of its work in ecommerce development, so it suits brands whose retention problem sits partly in the store.
- Yotpo named Superco its EMEA Best Retention Marketing Agency in the Yotpo Partner Awards 2025.[16]
- Clutch shows a 4.9 rating from 58 reviews and a $25,000+ minimum project. Ursa Major Skincare's Director of E-Commerce describes an audit of existing retention efforts followed by new retention initiatives, and fourfive's Head of E-Commerce reports an improved subscription sign-up rate after a Shopify migration with Klaviyo and Recharge.[17]
- Recharge's partner directory lists Superco at its Elite tier in London and names Georgie & Tom's, Cult Mia, Represent and Perfect Ted among its clients.[18]
- Its website lists email and SMS with Klaviyo and subscriptions with Recharge, and names Represent, Ursa Major, Puresport and Allbirds among its clients.[19]
