WP Mail SMTP by WPForms – The Most… vs Klaviyo (2026)
Detailed side-by-side comparison of two WordPress plugins, based on real-time data from WordPress.org.
WP Mail SMTP by WPForms – The Most…
4.0M+ active installs
Free
Quick Verdict
As of April 2026, WP Mail SMTP by WPForms – The Most… has a higher user rating (4.8/5 from 5,089 reviews) and leads in active installations (4.0M+ vs 100K+). Both are free WordPress plugins. WP Mail SMTP by WPForms – The Most… has accumulated 76M+ total downloads while Klaviyo has 1.5M+. Klaviyo has a higher support resolution rate (100% vs 88%).
Detailed Comparison
| Metric | WP Mail SMTP by WPForms – The Most… | Klaviyo | |
|---|---|---|---|
| Rating | 4.8/5 | ◄ | 2.8/5 |
| Total Reviews | 5,089 | ◄ | 24 |
| Active Installs | 4.0M+ | ◄ | 100K+ |
| Total Downloads | 76M+ | ◄ | 1.5M+ |
| Support Resolution | 88% | ► | 100% |
| Last Updated | 4 months ago | ► | 3 weeks ago |
| First Released | 2007 | 2012 | |
| Age | 19 years | 14 years | |
| WP Requires | 5.5+ | 5.2+ | |
| PHP Requires | 7.4+ | 7.0+ | |
| Business Model | Free | Free | |
| Latest Version | 4.7.1 | 3.7.3 |
Rating Breakdown
WP Mail SMTP by WPForms – The Most…
Klaviyo
Download Trends
Over the past 30 days, WP Mail SMTP by WPForms – The Most… averaged approximately 14,159 daily downloads while Klaviyo averaged 2,402.
Recent Reviews
WP Mail SMTP by WPForms – The Most… Reviews
Great plugin!
Easy to install and configure. Works like a charm!
Love it
easy and reliable
Does the Job, Needs Improvement
WP Mail SMTP by WPForms works well for email delivery, with easy setup. However, it lacks some advanced features and customization. 4 stars! This topic was modified 2 days, 1 hour ago by janel
Klaviyo Reviews
0 star if I can
this plugin is useless piece of work. idk why in 2025 klavydio is so behind and can’t just simply create normal html format codes, why to bother with java nonsense – but worse – why to make a plugin t
Stay away
This plugin is just confusing to get to work. And the amount of spam emails they send out after you register are crazy! I deleted my account there after 10+ emails yesterday, today i still got 4
constant 502 errors
Would give zero stars if I could. This thing made my wp-admin practically unusable. The website was fine for visitors, but actually building the website was mind-numbingly, throw the computer out the
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Frequently Asked Questions
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Plugin data sourced from WordPress.org. Comparison and analysis by PluginSift.