Duplicate Killer – Prevent Duplicate… vs Contact Form 7 Email Validation (2026)
Detailed side-by-side comparison of two WordPress plugins, based on real-time data from WordPress.org.
Duplicate Killer – Prevent Duplicate…
1.0K+ active installs
Free + Premium
Contact Form 7 Email Validation
1.0K+ active installs
Free
Quick Verdict
As of April 2026, Duplicate Killer – Prevent Duplicate… has a higher user rating (5/5 from 3 reviews) and leads in active installations (1.0K+ vs 1.0K+). Both are free + premium WordPress plugins. Duplicate Killer – Prevent Duplicate… has accumulated 20K+ total downloads while Contact Form 7 Email Validation has 26K+.
Detailed Comparison
| Metric | Duplicate Killer – Prevent Duplicate… | Contact Form 7 Email Validation | |
|---|---|---|---|
| Rating | 5/5 | ◄ | 3.3/5 |
| Total Reviews | 3 | ► | 10 |
| Active Installs | 1.0K+ | 1.0K+ | |
| Total Downloads | 20K+ | ► | 26K+ |
| Support Resolution | 100% | N/A | |
| Last Updated | Today | ◄ | 5 years ago |
| First Released | 2022 | 2016 | |
| Age | 4 years | 10 years | |
| WP Requires | 5.2+ | 4.9+ | |
| PHP Requires | 5.6.20+ | false+ | |
| Business Model | Free + Premium | Free | |
| Latest Version | 1.5.7 | 3.5.2 |
Rating Breakdown
Duplicate Killer – Prevent Duplicate…
Contact Form 7 Email Validation
Download Trends
Over the past 30 days, Duplicate Killer – Prevent Duplicate… averaged approximately 78 daily downloads while Contact Form 7 Email Validation averaged 3.
Recent Reviews
Duplicate Killer – Prevent Duplicate… Reviews
Great and straightforward plugin
Plugin is straightforward and the support is really responsive and helpful.
Fixed the issue with duplicate CF7 Emails!!
There seems to be an issue with CF7 where duplicate emails are sent out, and the forms render errors/loading spinners twice as well. I’ve done a good bit of research and looked everywhere, but had no
Works like a charm
This solves my duplicate entries headache – works as intended. Thanks!
Contact Form 7 Email Validation Reviews
Unsupported and abandoned.
Does not work, this plugin is unsupported.
Plugin doing email fields are require
Nice solution. Plugin doing email fields are require. Thanks author for added translation option.
Works as of Sep.2020 in WordPress 5.5.1
I just wish it was possibly to translate the error message from English to locale, as described here: https://wordpress.org/support/topic/plugin-translation-ready/ This topic was modified 5 ye
Frequently Asked Questions
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Plugin data sourced from WordPress.org. Comparison and analysis by PluginSift.