For most small e-commerce stores, Omnisend is the cheaper and simpler choice, while Klaviyo is the stronger choice for stores that live on deep segmentation, predictive analytics and a large integration catalog. Both offer free plans, both combine email and SMS, and the gap shows up mostly in price at scale and in how much data work you want to do.
Reviewers consistently position Klaviyo as the premium data-driven option and Omnisend as the value-oriented one. That framing holds up in the documented pricing, though the two are closer than the marketing from either side suggests. Third-party sources, several written by competitors, disagree on some free-tier SMS details, so verify current pricing and limits on both vendors' pricing pages before committing.
How We Compared Klaviyo and Omnisend
We compared the two using each vendor's published plans, third-party pricing comparisons, feature documentation and patterns across verified user reviews. We did not run campaigns or send messages from either account. The yardstick is the same for both: cost at 500, 2,500 and larger list sizes, what the free plan includes, how SMS is billed, strength of segmentation and automation, and how easy it is to leave. Where sources conflict, we say so.
Free Plans and Entry Pricing
Both platforms document a free plan of 250 contacts and 500 emails a month. One source says Omnisend's free plan also includes 60 SMS messages and Klaviyo's includes 150 SMS credits, while another lists no SMS credits on Klaviyo's free tier, so treat free SMS as unconfirmed. At the first paid step, sources list Omnisend Standard at about $16 a month for 500 contacts and Klaviyo's email plan at about $20 for 500 profiles. At 2,500 contacts the two converge, with Omnisend Pro at about $59 and Klaviyo at about $60 according to one comparison. The cost difference is real at low volumes and narrower than expected at mid-sized lists, and Omnisend's own comparison pages are a vendor source, so weigh them accordingly.
How SMS Is Billed
Neither entry price includes meaningful SMS. Klaviyo SMS is reported at roughly $0.007 to $0.009 per message depending on destination, and one source says SMS access is tied to certain plans, which conflicts with other reports. Omnisend sells SMS as purchased credits on top of the email subscription. For a store planning serious SMS volume, SMS spend can exceed the email subscription, so model both lines of cost together. Reviewers also note that US SMS needs carrier registration and consent handling on either platform.
Segmentation, Automation and Analytics
This is Klaviyo's documented strength. Reviewers consistently describe deeper segmentation on purchase behavior, predictive analytics such as expected next order date and lifetime value, and a larger catalog of e-commerce integrations. Omnisend documents capable automation workflows, pre-built e-commerce flows, and multichannel campaigns that mix email, SMS and push in one workflow, but its analytics are described as lighter. If your growth plan depends on slicing audiences by behavior, Klaviyo's ceiling is higher. If your needs are welcome series, abandoned cart, post-purchase and winback flows, both cover them.
Klaviyo vs Omnisend Side by Side
| Factor | Klaviyo | Omnisend |
|---|---|---|
| Free plan | Documented, 250 contacts, 500 emails | Documented, 250 contacts, 500 emails |
| Entry paid email plan | About $20 for 500 profiles | About $16 for 500 contacts |
| At 2,500 contacts | About $60 per one comparison | About $59 (Pro) per one comparison |
| SMS billing | Per message, roughly $0.007 to $0.009 reported | Purchased credits on top of the plan |
| Segmentation depth | Strongest of the two per reviewers | Capable, lighter |
| Predictive analytics | Documented | Lighter, per reviewers |
| Best fit | Data-driven stores and larger lists | Small and mid-size stores wanting value |
Where Each One Disappoints
Klaviyo's most common criticism is pricing that climbs as profile counts grow, and a learning curve that rewards data-literate teams. Omnisend's most common criticisms are lighter reporting and fewer advanced segmentation options. Both ask you to rebuild flows and templates if you leave, and neither migration is automatic, though list and subscriber data export cleanly as CSV. For a broader look at the field, see our roundup of the best email marketing software for small business.
Which Store Should Choose Which
A store with under a few thousand contacts, a standard set of automations and a tight budget will usually be well served by Omnisend. A store with a large catalog, repeat-purchase economics and a marketer who wants cohort-style segmentation tends to outgrow Omnisend and benefit from Klaviyo. If you are unsure, the free plans make it low-risk to build the same welcome flow in each and compare how the editors feel before moving a full list.
Integrations and Platform Fit
Both platforms document native integrations with the major e-commerce platforms, including Shopify, WooCommerce and BigCommerce, which is where most of their users sit. Reviewers consistently describe Klaviyo's integration catalog as the larger of the two, with more third-party apps for reviews, loyalty, subscriptions and customer support connecting directly. Omnisend covers the common integrations and is often described as enough for a typical store, but a store with an unusual stack should check the integration list for each app it depends on before switching. A missing connector can force a workaround through a third-party automation tool, which adds cost and a point of failure.
Deliverability, Support and Ease of Use
Deliverability is hard to compare from documentation because it depends on your list quality, sending habits and domain setup more than on the platform. Both vendors document authentication tools and best-practice guidance, and neither can promise inbox placement. On ease of use, reviewers generally describe Omnisend's editor and automation builder as quick to learn, and Klaviyo as more powerful but more demanding. Support quality is reported unevenly for both, with live chat availability depending on plan tier, so check which support channels your plan includes. If you value a gentle start and clear templates, Omnisend tends to suit better. If you have a marketer who enjoys building segments, Klaviyo rewards the effort.
A Practical Way to Decide
Start with your list size and your growth plan. Under a few thousand contacts with standard flows, the price difference is small and ease of use may decide it. Above that, model total cost including SMS for the volume you actually plan to send, and ask whether segmentation depth would change your revenue. If you cannot name a specific segment or prediction you would use, you probably do not need the extra depth yet. Both free plans let you build a welcome flow before spending anything, which is the lowest-risk way to see which editor fits your team.
The bottom line: pick Omnisend for a small or mid-size store that wants solid e-commerce flows at a lower price, and pick Klaviyo when deep segmentation and predictive data are central to how you grow.
