Quick answer
No winner yet. Klaviyo and Omnisend differ most in architecture and intended operating model. Use this researched comparison to decide which deserves a hands-on pilot—not as a substitute for one.
At a glance
| Decision factor | Klaviyo | Omnisend |
|---|---|---|
| Ecommerce focus | B2C CRM with ecommerce use | Ecommerce-specific positioning |
| Billing unit | Active profiles + prepaid mobile messaging | Contacts/list size + SMS usage |
| Free plan | 250 profiles · 500 emails · $5 mobile/mo | 250 contacts · 500 emails/mo |
| Email limits | 10× plan profile limit (e.g., 50,000 sends at 5,000 profiles) | Standard: tier limits · Pro: unlimited (fair use) |
| SMS model | Prepaid monthly dollar plan; per-message rates include carrier fees (since Jul 13, 2026) | Per-country volume rates (US $0.009–$0.007) |
| Automation | Flows documented; depth untested | Automations documented; depth untested |
| Data / segmentation | Profile/CDP positioning | Verify segmentation data depth |
| Integrations | Verify storefront and API depth | Shopify, WooCommerce, others |
| Attribution / reporting | Built-in reporting; verify definitions | Verify definitions |
| Support / migration | Verify onboarding terms | Vendor-stated free migration; verify |
Architecture and target user
Klaviyo
A B2C CRM and marketing platform spanning email, SMS/mobile messaging, customer data, and analytics.
Worth investigating for ecommerce teams that want email and SMS on a shared customer-data layer.
Omnisend
An ecommerce email and SMS platform for Shopify, WooCommerce, and other commerce platforms.
Worth investigating for merchants who want ecommerce-oriented email + SMS with contact-based tiers.
Ease and implementation considerations
Klaviyo
Verify storefront sync, custom events, historical backfill, flow rebuilds, deliverability setup, and data governance.
Omnisend
Verify storefront integration, catalog/order sync, flow rebuilds, migration terms, SMS market availability, and deliverability setup.
These are research observations, not timing or usability test results. Implementation depends on catalog, data migration, design, channels, integrations, internal skills, and partner scope.
Ecosystem and integrations
Klaviyo
Confirm integration depth for your storefront, API limits, exports, and which additional platform products are relevant.
Omnisend
Confirm supported storefronts, API access, exports, and SMS/MMS availability in your markets.
Pricing approach
Klaviyo: Free plan: up to 250 active profiles, 500 emails/month, and $5 of mobile messages/month. Klaviyo prices email by active profiles: $20/month at 500, $100 at 5,000, $400 at 25,000 and $1,380 at 100,000, with sends capped at 10× the tier (checked Oct 7, 2026).
Current Klaviyo pricingOmnisend: Free: $0/month for 250 contacts and 500 emails/month, usable indefinitely per FAQ. Official pricing says paid plans start from $16/month and scale with contacts; verify the calculator. US SMS ranges $0.009–$0.007 by bundle volume. Verified Sep 28, 2026.
Current Omnisend pricing| List size | Klaviyo | Omnisend Standard | Omnisend Pro |
|---|---|---|---|
| 5,000 | $100 | $81 | $90 |
| 25,000 | $400 | $282 | $400 |
| 100,000 | $1,380 | $900 | $1,334 |
Monthly list prices, email only, excluding Omnisend's 3-months-upfront promotion. Units differ: Klaviyo bills active profiles; Omnisend bills contacts who received messages. Profiles and contacts are not the same unit, so model your real list, sends, SMS markets, and add-ons in each vendor's calculator.
Build a scenario-based total-cost model. Include implementation, ongoing labor, extensions, communications or payments, support, and migration—not only the published base price.
Which businesses should investigate each
Investigate Klaviyo if…
- Customer data and segmentation depth are central requirements.
- Active-profile billing fits how your list is structured.
- You want email and SMS managed on one profile layer.
Investigate Omnisend if…
- You run Shopify, WooCommerce, or another supported storefront.
- Contact-tier pricing matches your list growth.
- Per-country SMS rates fit your markets.
What we still need to test
- Connect the same storefront and audit profile/contact counts each vendor would bill.
- Rebuild the same four flows and record setup time and limitations.
- Send equivalent test campaigns and document deliverability setup and rendering.
- Compare attribution definitions and run a holdout where supported.
- Export data and consent records to document migration and exit.
BestStorefront will not name a winner before those scenarios are completed and documented.
Decision support
Frequently asked questions
Is Klaviyo or Omnisend better?
BestStorefront has not established that. Billing units, data scope, and positioning differ; requirements-led testing is needed.
Which is cheaper?
No conclusion is supported. Active-profile and contact-based billing diverge depending on list structure, sends, and SMS markets.
Where can I find deeper email-specific research?
For deeper email-platform reviews and comparisons, see BestSends.com — part of The Best Network.
What changed
- Oct 7, 2026: Added both vendors' published list prices at three list sizes and Klaviyo's 2026 SMS billing change.