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Head-to-head · Merchant Marketing Software

Klaviyo vs Sailthru

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score Klaviyo #1 in Merchant Marketing Software 9.2/10 Free plan Free plan✓ 0 of 4 features Visit Klaviyo
Sailthru #8 in Merchant Marketing Software 8.2/10 Pricing on request ✓ 0 of 4 features Visit Sailthru

Klaviyo leads on 0 checks, Sailthru on 0, and 1 is even. Who comes out ahead on the 1 yes/no, price and count check where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreKlaviyo · 9.2/10
  • Free planonly Klaviyo

Klaviyo scores higher on our rubric for merchant marketing software: 9.2 against 8.2 out of 10; our editors rank them #1 and #8.

Klaviyo is the better fit for ecommerce teams needing multichannel marketing. Sailthru is the better fit for mid-market and enterprise lifecycle marketing teams.

  • Klaviyo fits best

    Ecommerce teams needing multichannel marketing

  • Sailthru fits best

    Mid-market and enterprise lifecycle marketing teams

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Klaviyo 9.2/10 Visit ↗ Sailthru 8.2/10 Visit ↗
At a glance
Editor score 9.2 8.2
Ranking #1 in Merchant Marketing Software #8 in Merchant Marketing Software
Best for Ecommerce teams needing multichannel marketing Mid-market and enterprise lifecycle marketing teams
Pricing model Free plan + paid Paid
Starting price — Pricing on request
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Cloud Cloud, Mobile
Platforms Web Web, iOS, Android
Support Email, Live chat, Community, Docs · 24/7 Tickets, Docs
Compliance ISO 27001, PCI DSS SOC 2, SSO/SAML, 2FA
Built for Small business, Mid-market, Enterprise Mid-market, Enterprise
Features Klaviyo 0/4 · Sailthru 0/4
Email campaigns Not checked yet Not checked yet
SMS campaigns Not checked yet Not checked yet
Campaign automation Not checked yet Not checked yet
Loyalty programs Not checked yet Not checked yet
Specs
Marketing channels Not checked yet Not checked yet
Ecommerce integrations Not checked yet Not checked yet
Our review
Pros
  • Automates email, SMS, and push flows
  • Segments audiences in real time using behavioral data
  • Connects to 350+ integrations and flexible APIs
  • Coordinates email, SMS, push, in-app, and web messaging
  • Uses behavioral, interest, and purchase data for audience creation
  • Combines automated journeys with predictive insights and analytics
Cons
  • Free plan caps usage at 250 active profiles and 500 monthly email sends
  • Email plan lists 15,000 monthly sends, which may not suit higher-volume needs
  • Paid plans scale with profiles, email volume, and channel usage
  • Pricing is handled through sales rather than published self-serve plans
  • Broad channel coverage may exceed the needs of email-only teams
  • Implementation relies on APIs and mobile SDKs for some data and event workflows
Our verdict

Klaviyo brings email marketing, SMS, push flows, customer data, analytics, and segmentation into a B2C CRM for consumer brands. Ecommerce teams can create campaigns and automated flows, build behavior-based audiences, personalize messages,…

Read the review →

Sailthru is a cross-channel marketing platform from Zeta Global for media, publishing, and retail brands. It brings personalized email together with SMS, mobile push, in-app, and web campaigns, using unified customer profiles and…

Read the review →
  1. KlaviyoMerchant Marketing Software 9.2Free plan
  2. SailthruMerchant Marketing Software 8.2Pricing on request

Strengths and trade-offs

  • Klaviyo — where it wins

    • Automates email, SMS, and push flows
    • Segments audiences in real time using behavioral data
    • Connects to 350+ integrations and flexible APIs

    Where it doesn't

    • Free plan caps usage at 250 active profiles and 500 monthly email sends
    • Email plan lists 15,000 monthly sends, which may not suit higher-volume needs
    • Paid plans scale with profiles, email volume, and channel usage

  • Sailthru — where it wins

    • Coordinates email, SMS, push, in-app, and web messaging
    • Uses behavioral, interest, and purchase data for audience creation
    • Combines automated journeys with predictive insights and analytics

    Where it doesn't

    • Pricing is handled through sales rather than published self-serve plans
    • Broad channel coverage may exceed the needs of email-only teams
    • Implementation relies on APIs and mobile SDKs for some data and event workflows
  • Klaviyo9.2/10 · Free plan

    An all-rounder for ecommerce teams combining campaigns, automated flows, and audience data.

    Visit KlaviyoFull verdict →
  • Sailthru8.2/10 · Pricing on request

    A multichannel lifecycle platform for teams coordinating personalized customer messaging.

    Visit SailthruFull verdict →

More comparisons

All merchant marketing software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update