Omnisend wins for most UK Shopify stores

Klaviyo and Omnisend are the two most popular email marketing tools for Shopify stores in the UK. They are close enough in capability that choosing between them is not obvious — which is why this comparison exists.

The short answer

For most UK Shopify stores, Omnisend is the better starting point. EU data residency by default, a 4.8 Shopify app store rating, and lower pricing at equivalent contact counts are advantages that matter for the typical UK store.

Klaviyo wins for stores that have grown to a point where its predictive analytics — customer lifetime value prediction, churn probability, next order date — deliver measurable ROI, and where the team is comfortable with a more complex setup.

Price comparison

Contacts	Klaviyo (Email)	Omnisend (Standard)	Saving with Omnisend
Up to 250	Free	Free	—
Up to 500	~£20/mo	~£16/mo	~£4/mo
Up to 1,000	~£35/mo	~£26/mo	~£9/mo
Up to 2,500	~£60/mo	~£40/mo	~£20/mo
Up to 5,000	~£110/mo	~£65/mo	~£45/mo

Prices in GBP at April 2026 exchange rates. Both tools price in USD — verify current prices before committing.

The gap widens as your list grows. At 5,000 contacts, Omnisend is approximately 40% cheaper than Klaviyo. If Klaviyo’s additional features are not delivering proportionate revenue, that saving is hard to justify.

GDPR comparison

This is the most significant practical difference for UK businesses.

Omnisend stores all data in the EU by default. No action required. Sign up, import your list, and your data is EU-hosted.

Klaviyo stores data in the US by default. EU data residency is available, but must be selected at account creation — it cannot be changed afterwards. If you create a Klaviyo account without selecting EU region, your data is in the US.

For UK stores where this matters: sign up for Klaviyo only when you know to select EU region at setup. For stores where this is a genuine compliance requirement, Omnisend removes the risk entirely.

Shopify integration comparison

Both tools have excellent Shopify integrations. The differences are at the margins.

Omnisend has a 4.8 app store rating from 5,800+ reviews — higher than any other tool on this list. The integration installs in one click and covers the essentials: abandoned cart, post-purchase sequences, welcome series, product picker in emails.

Klaviyo has a 4.0 rating from 2,847 reviews. Its integration goes deeper in specific areas: predictive CLV scoring, browse abandonment tracking (requires a JavaScript snippet), and product recommendations that use machine learning rather than static product blocks.

For stores that use browse abandonment flows and want predictive product recommendations, Klaviyo’s integration adds genuine value. For stores running standard abandoned cart and post-purchase sequences, Omnisend’s integration is sufficient and the higher app rating reflects a smoother experience.

Feature comparison

Feature	Klaviyo	Omnisend
Predictive CLV	✓	✗
Churn probability scoring	✓	✗
Browse abandonment	✓	✓ (basic)
SMS marketing	✓	✓
Web push notifications	✗	✓
Pre-built flow templates	40+	20+
A/B testing	✓	✓
EU data residency default	✗ (manual)	✓

Who should choose Klaviyo

• Your store has 2,000+ contacts and you actively use segmentation based on purchase frequency and CLV
• You need predictive analytics to power win-back flows and identify high-value customers
• You want email and SMS in one platform and find Omnisend’s SMS offering too limited
• You are comfortable selecting EU data residency at account setup

Who should choose Omnisend

• Your store has under 2,000 contacts and you want the best Shopify integration at a lower price
• GDPR data residency must be correct by default, not by configuration
• You want web push notifications alongside email and SMS
• You are switching from Mailchimp and want the smoothest migration

Our verdict

Omnisend is the default recommendation for UK Shopify stores. It handles GDPR compliance automatically, costs less at every price tier, and its Shopify app store rating of 4.8 indicates a consistently positive integration experience.

Klaviyo is worth the premium when your store has grown to the point where predictive analytics and very deep segmentation drive measurable revenue. At that scale, the additional monthly cost is a reasonable investment.

If you are unsure which stage your store is at, start with Omnisend. You can migrate to Klaviyo later if you find yourself wanting the predictive CLV features — your email list migrates via CSV in under an hour.