Klaviyo vs Dotdigital: which suits UK ecommerce?

What to take away

Where the two platforms actually differ

Klaviyo grew out of ecommerce. Store activity arrives as structured events, so a browse, a basket or a repeat purchase can each start a flow without a separate integration project.

Dotdigital came from email service provision. Preference centres, surveys and reported consent states appeal to teams that must show what a contact agreed to and when.

The practical difference is where the data model lives. Klaviyo expects the store to be the source of truth. Dotdigital expects your CRM or database to be.

Data residency, consent and the rules that bite

Ask both vendors where UK or EU contact data is hosted, which sub-processors can reach it, and how long suppression lists survive a cancellation. Each vendor publishes a sub-processor list, and Article 28 of the UK GDPR requires the written data processing agreement that sits behind it.

The Information Commissioner's Office (ICO) publishes its Direct marketing guidance, which explains consent, soft opt-in and objections, and it applies whatever platform sends the message. The ICO also keeps a public register of fee payers, where you can check that a sender has paid the data protection fee.

Underneath that sits the Privacy and Electronic Communications Regulations 2003, which govern electronic mail marketing. An automated flow is still a marketing message, so a trigger does not create a new legal basis.

Shopify setup and campaign shape

UK shoppers buy online in volume, and the ONS Retail Sales Index reports each month how much retail spending happens online. Both platforms are built to serve that demand, but they capture it differently.

For a Shopify merchant the event route usually decides the winner. Back-in-stock and replenishment messages need order and stock data within minutes, and a connector that syncs hourly will not support them.

Other store connections matter as much as Shopify. Klaviyo and Dotdigital both publish connectors for WooCommerce, BigCommerce and Magento (Adobe Commerce), and each vendor lists accredited agencies and systems integrators in its partner directory. Ask a partner for UK store references from shops of a similar size before you commit, because the connector is only half the build.

If the shortlist includes other ecommerce tools, put them on the same written scenario rather than on feature lists, which is the only way the totals mean anything.

Dotdigital's advantage shows up where campaigns are built by a marketing team with a CRM behind them. A win-back series that starts from a lapsed segment, or a post-purchase survey that feeds a service team, plays to its strengths.

How the two pricing models differ

Klaviyo bills on active profiles and send volume. Dotdigital bills on contacts and emails sent, with tiers that shift as the list grows. Both change their tiers, so check each vendor's own pricing page on the day you compare.

Work through your own list size, send frequency and channels on both calculators; the ranking can flip once SMS or a second brand is added.

Also price the exit. Export formats, suppression handling and the cost of rebuilding flows are part of the total.

Six steps to a decision

Common questions

Is Klaviyo more expensive than Dotdigital in the UK?

Neither is uniformly cheaper. Klaviyo's active-profile model can cost more for large, low-engagement lists, while Dotdigital's contact tiers can cost more once send volume climbs. Compare your own list size and send volume in each calculator.

Which platform suits a Shopify shop?

Klaviyo normally wins on native store events, especially for back-in-stock and replenishment flows. Dotdigital remains viable where the CRM, not the store, holds the customer record.

Can we comply with UK GDPR on either platform?

Yes. Compliance depends on your lawful basis, notices, objection handling and withdrawal, so test that path before a trial starts.

How long does a switch take?

Plan for several weeks for a mid-sized list: export, field mapping, flow rebuild, consent checks and a parallel send. Larger estates with several brands take longer.