10 Best Klaviyo Alternatives in 2026
Updated September 7, 2026 · Ranked by how closely each plugin matches, from WordPress.org data · How this works
Klaviyo has 100,000+ active installs on WordPress.org. These 10 plugins share its category or its tags on WordPress.org, are actively maintained, and each has at least 100 active installs. They are ordered by how closely they match, not by our opinion.
The 10 closest alternatives to Klaviyo
- 1
Website Pop-up Builder by BDOW!
Closest matchWebsite Pop-up Builder by BDOW! (formerly Sumo): Pop-ups + forms for email opt-ins and lead generation
4.2 (519) 10,000+ active installsSumo is trusted by over 600,000 businesses — small and large — in growing their email lists, customer base, and revenue online.
Shares the analytics, email, marketing tags on WordPress.org. 10,000+ installs against 100,000+, no update since June 5, 2025.
- 2
Easy WP SMTP – WordPress SMTP and Email Logs: Gmail SMTP, Office 365, Outlook, Custom SMTP, and more
4.6 (707) 500,000+ active installsMake SMTP email sending and delivery easy. Configure Gmail SMTP, Outlook, Brevo, SendGrid, Mailgun, SendLayer or connect to any SMTP server.
Shares the email tag on WordPress.org. About 5 times the installs, last updated 26 days ago.
- 3
Post SMTP
Paid version availablePost SMTP – Complete Email Deliverability and SMTP Solution with Email Logs, Alerts, Backup SMTP & Mobile App
4.7 (525) 300,000+ active installsImprove WordPress email deliverability. Connect Gmail SMTP, Microsoft 365, Brevo, SendGrid, Mailgun, Zoho, Amazon SES, etc. #1 WordPress SMTP Plugin.
Shares the email tag on WordPress.org. About 3 times the installs, last updated 13 days ago.
- 4
HubSpot All-In-One Marketing – Forms, Popups, Live Chat
4.3 (207) 200,000+ active installsThe CRM, Sales, and Marketing WordPress plugin to grow your business better. Capture and engage web visitors with free live chat, forms, CRM, email ma …
Shares the analytics, marketing tags on WordPress.org. About 2 times the installs, last updated 14 days ago.
- 5
WP Mail SMTP by WPForms – The Most Popular SMTP and Email Log Plugin
4.8 (5,188) 4 million+ active installsMake email delivery easy for WordPress. Connect with SMTP, Gmail, Outlook, SendGrid, Mailgun, SES, Zoho, + more. Rated #1 WordPress SMTP Email plugin.
Shares the email tag on WordPress.org. About 40 times the installs, last updated June 25, 2026.
- 6
Email Marketing for WooCommerce by Omnisend
4.9 (168) 40,000+ active installsEmail Marketing, Newsletter, Email Automation, Forms, Pop Up, SMS, Abandoned Cart made easy for WordPress & WooCommerce by Omnisend
Shares the marketing, woocommerce tags on WordPress.org. About a third of the installs, last updated 7 days ago.
- 7
GTM Kit – Google Tag Manager & GA4 integration
4.8 (20) 30,000+ active installsGoogle Tag Manager and GA4 integration. Including WooCommerce data for Google Analytics 4 and support for server side GTM.
Shares the analytics, woocommerce tags on WordPress.org. About a third of the installs, last updated 14 days ago.
- 8
4.5 (142) 90,000+ active installsCustomize the default WooCommerce email templates design and text through the native WordPress customizer. Preview emails and send test emails.
Shares the email, woocommerce tags on WordPress.org. A similar number of installs, last updated July 29, 2026.
- 9
Mailonix – Email Template Customizer for WooCommerce
4.6 (105) 20,000+ active installsMake your WooCommerce emails become professional.
Shares the email, woocommerce tags on WordPress.org. About a quarter of the installs, last updated 16 days ago.
- 10
HollerBox — Fast & Effective Popups & Lead-Generation
4.8 (32) 2,000+ active installsGet more leads and sales with effective popups that convert! Integrate HollerBox with your favorite CRM and email marketing tools.
Shares the email, marketing tags on WordPress.org. 2,000+ installs against 100,000+, last updated July 27, 2026.
Switching from Klaviyo: common questions
What is the best alternative to Klaviyo?
Website Pop-up Builder by BDOW! is the closest match: it shares the same WordPress.org tags and has 10,000+ active installs with a 4.2 out of 5 rating.
Which Klaviyo alternative has the most users?
WP Mail SMTP, with 4 million+ active installs reported by WordPress.org.
Which Klaviyo alternative is rated highest?
Omnisend, rated 4.9 out of 5 by 168 reviewers. Only plugins with at least 50 reviews are counted.
Are these Klaviyo alternatives free?
Every plugin listed here is free to install from WordPress.org. Where WordPress.org marks a plugin as commercial, the developer also sells a paid version or add-ons, and that is shown on each plugin.
How are alternatives chosen?
Automatically, from WordPress.org data: plugins that share a category top 10 with Klaviyo score highest, then plugins that appear in the same WordPress.org rankings, then plugins with the same tags, weighted so rare tags count more than common ones. Plugins by the same author and plugins rated under 4.0 are left out.
How we choose these alternatives
Nothing on this page is picked by hand. Every day we walk the whole WordPress.org directory, then score every plugin against Klaviyo on three signals: sharing a category top 10 counts most, then appearing in the same WordPress.org rankings, then carrying the same tags, with rare tags counting for more than common ones like "wordpress". Plugins by the same author are excluded, so an author's own add-ons cannot fill the list, and so is anything rated below 4.0 or with fewer than 100 active installs. The ten highest scores are what you see, in that order. Full methodology.
The bottom line
Website Pop-up Builder by BDOW! is the closest match to Klaviyo by the data we track, and WP Mail SMTP has the widest reach with 4 million+ active installs. Omnisend shipped the most recent release, on August 31, 2026. The list is rebuilt every day from WordPress.org, so a plugin that stops being maintained drops out on its own.
Weekly · free
What moved this week
One email a week, built from the same daily snapshots these rankings come from: the plugins that climbed, what launched, and one ranking worth a look.