All-In-One Security (AIOS) – Security and Firewall vs Really Simple Security – Simple and Performant Security (formerly Really Simple SSL) (2026): PluginCheck
Quick Verdict
Pick All-In-One Security if you want a wide range of configurable firewall rules, login protections, and content security features under one roof. Pick Really Simple Security if you want a higher-rated, faster, more actively maintained plugin that focuses on SSL, 2FA, and vulnerability detection.
Both All-In-One Security (AIOS) and Really Simple Security rank among the most widely installed security plugins in the WordPress ecosystem, so the choice often comes down to how much depth and control you want versus how streamlined the experience feels. They share a common goal of hardening WordPress sites against common attacks, but they take very different approaches. Choosing between them typically reflects whether you prefer an all-in-one firewall or a focused hardening suite.
All-In-One Security (AIOS) – Security and Firewall
Protect your website investment with All-In-One Security (AIOS) – a comprehensive and easy to use security plugin designed especially for WordPress.
- Active installs 1M+
- Rating 4.7/5 (1,717)
- Last updated Sep 17, 2026
- Support resolved 82%
- Tested to WP 7.1.1
- Requires PHP 5.6
Really Simple Security – Simple and Performant Security (formerly Really Simple SSL)
Easily improve site security with WordPress Hardening, Two-Factor Authentication (2FA), Login Protection, Vulnerability Detection and SSL certificate.
- Active installs 3M+
- Rating 4.9/5 (8,864)
- Last updated Sep 15, 2026
- Support resolved 100%
- Tested to WP 7.1
- Requires PHP 7.4
Where All-In-One Security (AIOS) – Security and Firewall Wins
Deeper feature set out of the box
AIOS exposes a large library of firewall, brute-force, and content-protection toggles, giving administrators more granular control than Really Simple Security's leaner hardening menu.
Strong rating per review
With a 94/100 score across 1,717 reviews, AIOS shows consistently positive feedback from users who configure its many settings.
Proven scale with one million installs
AIOS is installed on over 1 million active sites, demonstrating long-term stability despite its larger footprint.
Where Really Simple Security – Simple and Performant Security (formerly Really Simple SSL) Wins
Higher overall quality score
Really Simple Security scores 98.71/100 versus AIOS's 93.32/100, reflecting stronger performance in ratings, support, and user satisfaction.
Better support resolution
Really Simple Security resolves 100.0% of support threads, compared with AIOS's 82.4%, meaning users are far more likely to get a response that resolves their issue.
Larger active install base and rating volume
With 3 million active installs and 8,864 reviews at 98/100, Really Simple Security has both broader adoption and a much larger rating sample backing its score.
Score-by-Score Comparison
Really Simple Security leads with a popularity score of 97/30 versus AIOS's 90/30, driven by 3 million active installs compared with 1 million.
Both plugins are tied at 100/25 for maintenance, with recent updates within days of each other in September 2026.
Really Simple Security edges ahead with a 98/15 rating score versus AIOS's 94/15, backed by more than five times the number of reviews.
Really Simple Security scores 100/15 in support with a 100.0% resolution rate, while AIOS scores 82/15 with 82.4% resolution.
Both plugins tie at 100/15 for compatibility, indicating equally solid integration with current WordPress versions.
The Bottom Line
For most WordPress site owners, Really Simple Security is the stronger pick: it scores higher overall (98.71 vs 93.32), resolves 100.0% of support threads, and carries a 98/100 rating across 8,864 reviews. AIOS remains a solid choice for users who want its broader firewall and login-hardening toggles, but Really Simple Security's lighter footprint, better support, and higher satisfaction make it the safer default. If you only need to install one security plugin and value ongoing maintenance quality, Really Simple Security wins.