Klaviyo review

• Ecommerce teams investigating email and SMS on one customer-data layer.
• Merchants who want to start on a free plan and understand how active-profile billing scales.
• Operators prioritizing segmentation, automation, and storefront event data.

• Teams with large lists of unengaged profiles: every emailable profile counts toward the billed tier unless suppressed.
• Buyers wanting only one narrow channel should compare whether the platform scope fits.
• Anyone expecting vendor ROI figures to stand in for measurement—BestStorefront does not adopt them.

Klaviyo presents itself as a B2C CRM and marketing platform spanning email, SMS/mobile messaging, customer data, analytics, and related customer experiences. This overview focuses on its ecommerce lifecycle-marketing role and what it costs.

Verify storefront integration depth for your platform, catalog and event sync, historical backfill, custom events, API limits, and exports. The pricing page lists additional platform products; confirm which are needed before modeling cost.

Klaviyo prices email by active profiles, which Klaviyo defines as any profile that can be emailed, "regardless of consent status". Each tier includes email sends equal to 10 times its profile limit. Mobile messaging and add-on products are billed separately. All prices are in US dollars per month, from Klaviyo's pricing calculator.

The free plan also includes $5 of mobile messages and $5 of Composer (AI) usage per month, and email support for the first 60 days. At the time of checking, Klaviyo advertised $19 off the first month on the 500-profile tier.

Mobile messaging (SMS/MMS)

Klaviyo sells mobile messaging as a prepaid monthly dollar amount. Rates include carrier fees, vary by country and by sender type (US/Canada toll-free versus short code), and unused spend does not carry over. Klaviyo's calculator showed these US toll-free examples on Oct 7, 2026:

That works out to roughly 1.5¢ falling to 1.2¢ per SMS. Your account's exact rate card is in Klaviyo under Settings › Billing › Account Usage. Failed deliveries are billable; opt-in confirmations, STOP/HELP replies and inbound messages are not. Klaviyo recommends a short code for sending to more than 95,000 people a month, at additional cost.

Add-ons that change the total

Klaviyo also sells Customer Agent, Helpdesk, Social marketing and an Advanced Klaviyo Data Platform (billed on total profiles, including suppressed ones). Prices checked Oct 7, 2026.

What happens when your list grows

Since Feb 18, 2025, Klaviyo requires every account to be on an email plan that matches or exceeds its active profile count. If a paid account goes over, Klaviyo upgrades it to the next tier at the start of the next billing cycle. A free account over the limit can't send campaigns or turn on flows until it's back under. Upgrades take effect immediately. Downgrades happen only at the next cycle, are not refunded mid-cycle, and automatic downgrading is opt-in.

Last verified: Oct 7, 2026, against Klaviyo's pricing page and help center.

Based on Klaviyo's own help center:

1. Suppress profiles that never engage. Suppressed profiles do not count toward your billed active profiles. Klaviyo's suggested inactivity segment covers profiles created at least 180 days ago that have received at least five emails in the last 72 weeks, with no opens, clicks, site activity, product views, checkouts or orders. Send a final "sunset" flow first, then use "Suppress current members" on that segment.
2. Time it before renewal. Klaviyo says to reduce your count at least 24 hours before your next billing cycle, and counts can take up to 72 hours to refresh. Do the cleanup several days early.
3. Turn on auto-downgrade. Klaviyo will move you to a lower tier when your count qualifies, but only if you opt in.
4. Understand flexible sending. If you opt in and exceed your send allowance, Klaviyo bills the next tier's capacity upfront at your current unit price for that cycle.
5. Size your SMS plan to real volume. Unused mobile-messaging dollars don't carry over.

Monthly list prices checked on each vendor's pricing page on Oct 7, 2026, excluding promotions (Omnisend showed 30% off for 3 months paid upfront; Mailchimp showed 15% off for 12 months above 10,000 contacts). The billing units differ: Klaviyo bills active profiles, Omnisend bills contacts who received messages (unsubscribed contacts aren't billed), and Mailchimp bills contacts with a monthly send cap. Brevo prices by emails sent per month rather than contacts, so it isn't directly comparable here. SMS and add-ons are excluded.

For SMS-first programs, compare Postscript and Attentive. For the full head-to-head with Omnisend, see Klaviyo vs Omnisend. Model your own volume with the email & SMS cost calculator.

Lifecycle platforms bill on different units: active profiles, contacts, subscribers, sends, messages, segments, channels, or add-ons. The same list can produce very different invoices depending on how each vendor counts it.

• Confirm storefront, catalog, order, event, and customer sync depth, latency, and historical backfill.
• Ask how attributed revenue is defined—window, channel, click versus open/view, and deduplication—and whether holdouts are available.
• Review deliverability tooling, sender authentication, list hygiene, and suppression handling.
• Map consent capture, opt-in records, quiet hours, regional messaging rules, and opt-out handling.
• Scope migration: flows, templates, segments, historical data, consent records, API access, and export after termination.

This page is based on first-party sources. BestStorefront has not yet created an account or run hands-on tests for this product.

• Connect a representative storefront and audit profile, order, catalog, and event sync accuracy.
• Build welcome, abandonment, post-purchase, and winback flows; record setup time and limitations.
• Send controlled test campaigns and document deliverability setup, rendering, and suppression behavior.
• Run a holdout where supported and compare attributed revenue with incremental estimates.
• Reconcile invoices against profiles, contacts, sends, message segments, carrier fees, and add-ons.
• Export profiles, consent records, and event data; document exit and migration burden.

Standard lifecycle, email and sms protocol — tasks every product in this category goes through:

• Import contacts and confirm consent fields
• Build a segment from behavioral and order data
• Create and send a campaign
• Build and trigger an automation
• Review campaign and revenue reporting
• Test suppression, unsubscribe and consent handling
• Export contacts and cancel the plan

No score or final verdict will be added until this work is complete.

This overview is based on the vendor's public documentation. Feature availability and commercial terms can change; verify details with the vendor.

Visit the official Klaviyo site