Two questions give you a starting point and checks to make before buying. No email address needed.
Editorial guidance based on product documentation, not a completed comparative product test. We may earn commission through links. Your answers, not commission rates, determine the recommendation.
Document how every subscriber gives consent, how suppression works and who monitors bounces and complaints. A larger list has no value if permission and sender reputation are weak.
2. Start with three lifecycle flows
Build a welcome flow, a cart or browse recovery flow and a post-purchase flow. These reveal whether store data, timing and message ownership work in practice.
3. Define the minimum useful data
List the customer, product, order and consent fields needed for each decision. Do not collect data simply because the platform can store it.
4. Test the weekly operating work
Create one campaign, one segment and one report in each trial. Record how many manual checks, approvals and fixes the process requires.
5. Measure beyond opens
Track qualified clicks, conversions, revenue, unsubscribes and complaints. Treat vendor attribution as one input and reconcile it with store and analytics data.
Compare the same workflow
Omnisend and Klaviyo: one shared store scenario
A planning example for a small store: 1,000 marketing contacts, 8,000 emails per month and one operator. SMS and push are excluded. These are workload assumptions, not measured results or a price promise.
Run the practical evaluation with three synthetic products and a few controlled test profiles in a separate store. Do not use 1,000 real customers as test data. The table is a documentation-led evaluation protocol; we have not completed this comparative product test.
Same task, two tools, one acceptance criterion
Task
Omnisend
Klaviyo
Pass when
Store connection
Follow the store-connection guide, then inspect the synced contacts, products and orders.
Follow the exact store integration guide and inspect the available events and properties.
The same sample order has the expected product, amount and customer in both tools.
Welcome flow
Use a prebuilt welcome workflow as the starting point; review the trigger and every message.
Build the equivalent entry rule and message sequence with the same sample profiles.
A subscribed test profile qualifies; an unsubscribed profile does not receive marketing.
Repeat purchase
Check whether the available order data can express your chosen reactivation rule.
Use the documented win-back flow as a starting point, then review filters and exclusions.
A new purchase removes the test profile from the intended reactivation audience.
Message review
Preview the email in the builder; check product links, mobile layout and unsubscribe.
Preview the equivalent message and verify the same links and profile-dependent content.
Only your controlled seed addresses receive test messages; no live customer campaign is enabled.
Monthly cost
Record the billable-contact tier, email allowance and any channel add-ons from a current quote.
Record the billable-profile tier, email allowance and any channel add-ons from a current quote.
Compare the same 1,000-contact, 8,000-email workload and record how each vendor counts billable records.
Operating effort
Record manual corrections and who owns each workflow.
Record manual corrections and who owns each workflow.
Your team can explain the trigger, stop the flow and export the records it needs.
What does your store need — and is free enough?
Start with an example or adjust two inputs. Get an immediate volume check without gathering quotes.
Add automated emails
The example assumes 0 automated emails. Welcome messages, cart flows and other automations also use your send allowance.
500 emails per month 250 × 2 + 0 automated emails
Your sending volume fits both free tiers
Omnisend Free: USD 0/month, up to 250 unique recipients and 500 emails. Klaviyo Free: USD 0/month, up to 250 active profiles and 500 emails. Klaviyo’s active profile count can exceed your send audience. Check required features before choosing.
Checked September 9, 2026. Email volume check, not a quote. Excludes SMS, add-ons and migration. Contacts × campaigns assumes every campaign reaches the full list. Inputs are not retrieved from your store.
Have prices? Compare the complete first year
Is switching worth the cost?
Use two current quotes for the same contacts, sends and channels. Enter all amounts in one currency and on the same tax basis. Enter 0 where no additional cost applies.
Calculation: 12 × monthly cost + other annual costs. Include your own time, migration help and overlapping subscriptions in other costs. The model assumes a constant monthly cost and predicts no sales increase. Amounts are not sent in the calculator measurement event.
From store to controlled test
Prepare a separate Shopify or WooCommerce store. Record the plan, integration and date. Check the plan's testing capabilities before paying.
Connect one email platform at a time. Preserve the original consent state and keep campaigns and automations disabled while inspecting data.
Create a subscribed profile, an unsubscribed profile and a previous buyer. Use your own addresses and record the expected outcome for each profile.
Build welcome and reactivation flows as drafts. Check entry, delays, exclusions and exit before enabling a restricted test.
Preview and use the vendor's test-send function with your own addresses. Log what actually happened, including blocked or failed steps.
Pause the test flows. Save screenshots with test data, record quoted cost and operating effort, then repeat the same tasks in the other tool.
Choose from the workflows your team can complete and maintain. Start with Omnisend when a prebuilt workflow is the main need; start with Klaviyo when detailed order-data segments are central. Keep your existing system if neither meets your requirements.