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Omnisend versus Klaviyo
Compare	Omnisend	Klaviyo
Verdict	Depends	Depends
Best for	Shopify and WooCommerce stores	Growing Shopify stores
Who it's not for	B2B, SaaS, or service businesses . tooling is built for online stores	Small stores watching every dollar
Privacy	No known public vulnerabilities found in the sources reviewed.^²	Multiple public incidents: a 2022 breach of crypto-customer lists, a 2026 password-exposure flaw, and a WordPress plugin XSS CVE.¹⁰
Support quality	No evidence found	No support evidence found
Public sentiment	No independent user reviews were found in the sources reviewed.	Reviewers praise Klaviyo's ecommerce depth and integrations but consistently complain about pricing and learning curve.¹⁵
Biggest gotcha	No security page surfaced; request SOC 2 and data-handling docs before syncing customer data.^²	Charged by active profiles . costs climb automatically as your list grows¹⁶

Pick Omnisend when

Shopify and WooCommerce stores
Ecommerce brands combining email and SMS
Small marketing teams, not developers

When Omnisend is not a fit

B2B, SaaS, or service businesses . tooling is built for online stores
Security-sensitive buyers who need public compliance documentation
Buyers who require independently verified ROI claims before committing

Pick Klaviyo when

Growing Shopify stores
Email + SMS retention marketing
Brands with dedicated marketing staff
Revenue-focused ecommerce teams

When Klaviyo is not a fit

Small stores watching every dollar
Teams wanting a simple newsletter sender
Non-ecommerce B2B or SaaS companies
Anyone unwilling to learn a complex tool

Sources

Omnisend homepageomnisend.com
official
Security pageomnisend.com
security
Klaviyo Features | G2g2.com
review
Klaviyo Reviews | Trustpilottrustpilot.com
review
Klaviyo Review | PCMagpcmag.com
review
Klaviyo User Reviews Analysis: 300-Review Studyomnisend.com
review
Why is Klaviyo so complicated to use? | Redditreddit.com
review
Klaviyo Pricing | Officialklaviyo.com
official
Klaviyo Pricing Hidden Fees Explained | Omnisendomnisend.com
review
Email marketing firm hacked, crypto lists stolen | BleepingComputerbleepingcomputer.com
security
Klaviyo password exposure | TechCrunchtechcrunch.com
security
CVE-2023-25456 details | Strixstrix.ai
security
Klaviyo raises $320M Series D | PR Newswireprnewswire.com
news
Klaviyo segmentation case study | Swankyswankyagency.com
review
g2.comg2.com
review
spoks.comspoks.com
review