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TL;DR: Klaviyo wins for Shopify brands above $500k that need deep flows and segmentation, while Omnisend wins below that line on price and simplicity. Klaviyo now bills on all profiles and costs more as you grow. Omnisend starts cheaper and made SMS Pro-only in 2026. Flows can't migrate either way, so picking right the first time saves a painful rebuild.
The choice of Klaviyo vs Omnisend for Shopify comes down to one number: flows drive 40%+ of email revenue from about 5% of sends, so platform depth matters more than sticker price once you pass roughly $500k in store revenue. Both tools sit at 4.6/5 on G2 and both plug straight into Shopify. The real split is who you are. Omnisend is the cheaper, faster start. Klaviyo is the deeper engine built to scale segmentation and automation. Here's the catch most comparison posts skip: flows cannot be migrated between the two platforms. Switch later and you rebuild every automation from scratch, with domain warm-up risk attached. So this isn't just a price comparison. It's a decision about where your store will be in two years, made today.
Which is cheaper?
Omnisend is cheaper at almost every list size. Its Standard plan starts near $16/mo and Pro near $59/mo with unlimited email. Klaviyo's email plan runs roughly $20 at 500 contacts, $30 at 1k, $100 at 5k, and $400 at 25k. For a small list, Omnisend can cost half as much.
But Klaviyo changed how it bills. As of 2025, Klaviyo charges on all active profiles, not just contacts you email. That means unengaged subscribers, repeat browsers, and old leads all count toward your tier. Per Klaviyo's pricing structure, a growing list quietly pushes your bill up even if you email the same people. Omnisend's own pricing pages bill on contacts too, but its unlimited-email Pro plan removes send caps that trip up high-frequency senders.
Pricing at a glance
- 500 contacts: Klaviyo ~$20/mo vs Omnisend free to ~$16/mo
- 1,000 contacts: Klaviyo ~$30/mo vs Omnisend ~$16/mo
- 5,000 contacts: Klaviyo ~$100/mo vs Omnisend ~$59/mo (Pro)
- 25,000 contacts: Klaviyo ~$400/mo vs Omnisend custom/Pro
- 100,000 contacts: Klaviyo ~$1,350/mo vs Omnisend custom
Treat these as ballparks. Both vendors adjust pricing, and SMS credits sit on top.
What about the free plan?
Both offer a free tier, and both cap it tight. Klaviyo's free plan gives 250 profiles, 500 email sends, and 150 SMS credits. Omnisend's free plan is similar on volume but adds one thing Klaviyo doesn't: 24/7 live chat and email support, even for non-paying users.
For a brand-new store testing the water, either free plan works to build a welcome flow and a first campaign. The difference shows up when you need help at 2 a.m. and you're on the free tier. Omnisend answers. Klaviyo's free and entry support narrows to business hours after the 60-day onboarding window closes.
Flows and automations
This is where the decision really gets made. Klaviyo's own benchmark data shows flows generate about 41% of email revenue from only 5.3% of sends. That's roughly 18x the revenue per recipient of a regular campaign. Your abandoned-cart and welcome flows are not a nice-to-have. They are the engine.
Klaviyo gives you deeper flow logic: conditional splits, trigger filters, A/B testing inside flows, and granular timing control. Per Klaviyo's 2026 email benchmarks, the abandoned-cart flow drives about $3.07 in revenue per recipient and the welcome flow about $2.35. Omnisend's automations are strong and genuinely easier to set up, and Omnisend's email marketing benchmarks report automated emails drive roughly 22x more revenue per email than bulk sends. The gap is depth, not capability. Simple stores rarely feel it. Stores running 8-12 flows with layered segments will.
Across the Shopify stores we manage at CartStrings, the brands pulling 32% or more of revenue from email are the ones running deep, well-segmented flows, not the ones with the cheapest plan. If your automations are thin, a Klaviyo audit usually finds the leak fast, and our email automations service builds the flow stack that captures it.
How does segmentation compare?
Klaviyo has the stronger segmentation engine. It builds live segments from any event, property, or predictive metric, so you can target buyers who purchased twice, opened in the last 30 days, and never bought a given category, in a few clicks. Omnisend segments well for the essentials but has fewer conditions and less predictive data.
At a small list, basic segments are enough. Past $500k, segmentation is how you protect deliverability and lift revenue per send at the same time. The ability to suppress unengaged profiles and reward your best buyers is where Klaviyo earns its premium. This ties directly into your sender deliverability, since tighter targeting keeps complaint rates down.
SMS, templates, and ease
On SMS, the platforms moved apart in 2026. Klaviyo bundles email and SMS from about $35/mo (500 contacts plus 1,250 SMS credits). As of May 4, 2026, Omnisend made SMS Pro-only, and new Pro SMS is an add-on at about $0.007 per message with no included credits. Older Omnisend Pro accounts keep their bundled credits. If SMS is core to your plan, price both carefully.
On templates and ease of use, Omnisend leads. It ships 350+ email templates versus Klaviyo's roughly 160, and its editor is friendlier for non-designers. Capterra scores reflect this: Omnisend 4.7 vs Klaviyo 4.6. Omnisend is the gentler tool to learn. Klaviyo trades some simplicity for control. For most teams, a strong template library matters less than how well your email campaigns are built and targeted, but the lower learning curve is real.
Which has better support?
Omnisend has the edge on access. It offers 24/7 live chat and email support on every plan, including free, with a first response often under 4 minutes. Klaviyo provides solid onboarding, but support narrows to business hours after the 60-day window for lower tiers.
For a lean team without an agency, round-the-clock chat is worth real money. For a brand with a partner managing the account, support hours matter less because someone already knows the platform cold.
The flow trap nobody mentions
Here's the part that should drive your decision more than any price table. Flows cannot be migrated between Klaviyo and Omnisend. Not exported, not imported, not copied. If you build 10 automations on Omnisend and later move to Klaviyo, you rebuild all 10 by hand, re-test every trigger, and re-warm your sending domain so inbox placement doesn't tank during the switch.
That makes "Omnisend is cheaper" a false economy if you'll outgrow it. The $40/mo you save at 2,000 contacts is wiped out by weeks of rebuild labor and a deliverability dip at 20,000. The common rule in our space holds up: pick Omnisend if you're under roughly $500k in GMV, pick Klaviyo at or above it. Choose for where you're going, not where you are.
A simple way to decide: estimate your revenue per contact. If a deeper segment or an extra flow split would lift revenue per recipient by more than Klaviyo's price premium over Omnisend, Klaviyo pays for itself. For most stores past $500k with 10k+ engaged contacts, it does. Below that, Omnisend's savings usually win.
One honest note. If you're a sub-$500k brand, Omnisend is the smart call. It's cheaper, easier, supports you 24/7, and covers the flows that matter at your stage. Don't pay for Klaviyo's depth before you can use it. Klaviyo's 2026 roadmap (Composer agentic campaign builder, Personalized Send Time with a reported 35% click lift, RCS carousels, WhatsApp) is built for brands scaling hard, not for stores still finding product-market fit.
Verdict by store size
Under $500k in revenue: choose Omnisend. Lower cost, faster setup, unlimited email on Pro, and support on every plan. It does everything a growing store needs without the premium.
At or above $500k: choose Klaviyo. Deeper flows, stronger segmentation, predictive data, and the room to scale that funds its higher price. The brands getting 39% open rates and 32% of revenue from email are almost always on a platform with this much control, run well.
Conclusion
There's no universal winner in Klaviyo vs Omnisend for Shopify. There's only the right fit for your stage. Omnisend is the better start: cheaper, simpler, well-supported. Klaviyo is the better engine: deeper flows, sharper segmentation, built to scale revenue per send as your list grows. The trap is treating this as a price decision when it's a growth decision, because flows can't move between them and rebuilding later is the real cost.
If you're past $500k and not sure your flows and segments are pulling their weight on either platform, that's exactly the gap we close. CartStrings runs as the outsourced email department for Shopify brands, and a quick look at your account usually shows where the revenue is leaking. Book a call and we'll tell you straight.
Frequently Asked Questions
Is Omnisend cheaper?
Yes, at most list sizes. Omnisend Standard starts near $16/mo and Pro near $59/mo with unlimited email, while Klaviyo runs higher and now bills on all active profiles, not just contacts you email. For small lists the gap can be roughly half. The savings shrink as you scale and need deeper flows.
Who has better deliverability?
Both can hit strong inbox rates because deliverability depends more on your sending practices than the platform. Klaviyo's deeper segmentation makes it easier to suppress unengaged profiles, which protects your sender reputation at scale. Omnisend performs well too. The brands we manage hit 99.8% inbox delivery through list hygiene and authentication, not the logo on the tool.
Can I migrate flows to Klaviyo?
No. Flows cannot be migrated between Omnisend and Klaviyo in either direction. You have to rebuild every automation from scratch, re-test each trigger, and warm up your sending domain again to protect inbox placement. This rebuild cost is the single biggest reason to pick the right platform up front.
When should I switch to Klaviyo?
A common rule in the space: move to Klaviyo at or above roughly $500k in store revenue. Below that, Omnisend's lower cost and simpler setup usually win. The switch makes sense when deeper segmentation and flow logic would lift revenue per recipient by more than Klaviyo's price premium, which is typical once you have a large, engaged list.
Which is easier for beginners?
Omnisend. It ships 350+ email templates versus Klaviyo's roughly 160, has a friendlier editor, and offers 24/7 live chat support on every plan including free. Its Capterra rating of 4.7 edges Klaviyo's 4.6, largely on ease of use. Klaviyo trades some simplicity for deeper control that pays off at scale.
