Most WordPress security plugins want your money.
Wordfence's premium tier costs $149/year. MalCare's useful features require $99/year. Even Sucuri's free plugin is really just a gateway to their $200+/year platform.
All In One WP Security for WordPress (AIOS) takes a different approach: everything is free. No premium tier, no upsells, no features locked behind a paywall.
With over a million active installations and a 4.7-star rating, AIOS Security has found a significant audience. But is free good enough? Or are you getting what you pay for?
What All In One WP Security Does
All In One WP Security focuses on hardening and defensive features. It's not trying to be a comprehensive security solution. It's trying to lock down your WordPress installation.
Comprehensive Hardening
All In One WP Security provides extensive options for securing your WordPress configuration:
- Change default database prefix
- Remove unnecessary information from HTML headers
- Disable file editing through the dashboard
- Protect against brute force attacks
- Block malicious query strings
- Prevent user enumeration
- Hide WordPress version information
These hardening features reduce your attack surface. They make your site a less obvious target and close off common vulnerability points.
Login Security
All In One WP Security includes robust login protection:
- Limit login attempts
- Lock out users after failed attempts
- Rename the login URL
- CAPTCHA options for login forms
- Force logout after inactivity
- Monitor logged-in users
The login security is comprehensive. Brute-force attacks are a real threat, and AIOS effectively addresses them.
Firewall Features
All In One WP Security includes firewall rules implemented through .htaccess files:
- Block known bad bots
- Prevent hotlinking
- Block directory browsing
- Protect configuration files
- Custom firewall rules
This is different from Wordfence's PHP-based firewall. AIOS operates at the Apache web server level, which has both advantages and limitations.
Security Strength Meter
The plugin includes a scoring system that shows your current security posture and suggests improvements. Features are categorized as low, medium, or high impact.
This gamification helps non-technical users understand what they've configured and what they might be missing.
File Integrity Monitoring
AIOS monitors WordPress core files for changes and alerts you if something is modified. This helps identify unauthorized changes that might indicate a compromise.
What All In One WP Security Doesn't Do
Understanding the gaps is critical.
No Malware Scanner
AIOS doesn't scan for malware. It can tell you if core files changed, but it won't identify malicious code injected into plugins, themes, or your database.
This is the biggest limitation. If your site is infected, AIOS won't detect it.
No Cleanup Service
When malware is found (by you or another tool), AIOS doesn't help you remove it. You'll need to handle cleanup yourself or use a different service.
Apache-Only Firewall
The .htaccess-based firewall only works on Apache servers. If your hosting uses Nginx or LiteSpeed, many of AIOS's firewall features won't function.
This is increasingly relevant as more hosting providers move away from Apache for performance reasons.
No Vulnerability Detection
AIOS doesn't check your plugins and themes for known vulnerabilities. It hardens your installation, but it won't warn you about a critical security flaw in a plugin you're using.
All In One WP Security vs Wordfence Free
Both are free. How do they compare? (For a full breakdown of Wordfence, see our Wordfence review.)
Comparison Table
| Feature | AIOS | Wordfence Free |
|---|---|---|
| Price | $0 | $0 |
| WordPress Hardening | ✓ Comprehensive | ✓ Basic |
| Login Security | ✓ Extensive | ✓ Yes |
| Two-Factor Authentication | ✓ Yes | ✓ Yes |
| Firewall | .htaccess rules (Apache only) | PHP-based WAF |
| Malware Scanner | ✗ No | ✓ Yes (30-day delayed signatures) |
| File Integrity Monitoring | ✓ Core files only | ✓ All files |
| Threat Intelligence | ✗ None | ✓ Yes (30-day delay) |
| Performance Impact | Low | High during scans |
| Upselling | None | Frequent prompts |
| Best For | Hardening + light footprint | Comprehensive free protection |
Where All In One WP Security Wins
Simplicity: All In One WP Security is easier to understand. The security strength meter guides you through improvements without overwhelming you with settings.
Performance: All In One WP Security uses fewer server resources. One user managing 130 sites reported being "pleasantly surprised" at how little load the plugin added across all of them.
No upselling: All In One WP Security doesn't constantly remind you to upgrade. Wordfence's free version includes persistent prompts to upgrade to premium features.
Where Wordfence Free Wins
Malware scanning: Wordfence scans your files for malware. AIOS doesn't. This is a significant difference.
Web application firewall: Wordfence includes a PHP-based WAF that blocks attack patterns. AIOS's .htaccess rules are more limited.
Threat intelligence: Wordfence has a large signature database of known threats. Even with the 30-day delay on the free tier, this provides real protection against identified attacks.
The Verdict
If you want hardening without complexity and don't need malware scanning, All In One WP Security is excellent.
If you want broader protection, including malware detection, Wordfence's free tier provides more coverage.
They can actually complement each other. Some users run both, using All In One WP Security for hardening and Wordfence for scanning. (Another hardening-focused option is Solid Security, which takes a similar approach.)
When All In One WP Security Makes Sense
You Have Server-Level Security
If your hosting includes real security infrastructure, Imunify360 or similar tools handle malware detection and blocking at the server level. All In One WP Security's hardening features add a layer without duplicating functionality.
In this scenario, AIOS's lack of malware scanning doesn't matter because another system handles that task.
Budget Is Zero
If you genuinely have no budget for security tools, All In One WP Security provides substantial protection for free. Hardening, login security, and firewall rules cost nothing.
You Want Low Overhead
For agencies or developers managing many sites, All In One WP Security's light resource footprint matters. You can install it across a portfolio without significantly impacting server performance.
You Run Apache
AIOS's firewall features require Apache. If that's your hosting environment, you get the full benefit of .htaccess rules.
When All In One WP Security Isn't Enough
As Your Only Security
AIOS provides hardening, not comprehensive protection. If it's your only security measure, you have no malware detection, no vulnerability alerts, and limited active defense.
For personal blogs, that might be acceptable. For organizations handling any sensitive information, it's not.
If You Need Malware Detection
AIOS won't tell you if your site is infected. If that capability matters, and it should for most sites, you need additional tools.
On Non-Apache Hosting
If your hosting uses Nginx or LiteSpeed, AIOS's firewall features won't work. The hardening features still function, but you lose a significant portion of the plugin's value.
For Mission-Critical Sites
Sites handling transactions, sensitive data, or important communications need more than hardening. AIOS is a layer, not a solution, for serious security requirements.
My Honest Assessment
All In One WP Security is legitimately good for what it does.
The hardening features are comprehensive. The login security is solid. The interface is more approachable than Wordfence's settings maze. And everything is free.
The "no malware scanner" limitation is real, but competitors are overblowing it to sell their own products. If you have other security layers, particularly server-level protection, the lack of plugin-based malware scanning isn't catastrophic.
What AIOS isn't: a complete security solution. It hardens your installation and protects against common attacks. It doesn't detect infections or protect against sophisticated threats.
Use All In One WP Security when: You want free hardening, you have other security layers, or you're adding it alongside other tools.
Don't use All In One WP Security when: It's your only security measure, and you're handling anything important.
The Better Question
Before choosing any security plugin, ask whether the plugin-based security addresses your actual needs. (For help deciding, see do you need a WordPress security plugin?)
If you're on shared hosting with no server-level protection, AIOS plus Wordfence provides decent coverage at no cost.
If you're on managed WordPress hosting with proper infrastructure, you may not need either. The server environment is already secured.
At FatLab, we include Cloudflare Enterprise WAF and Imunify360 on every site. Clients don't need AIOS, Wordfence, or any security plugin because protection is built into the infrastructure layer where it belongs. Explore our managed WordPress security services to see how we handle security at the infrastructure level.
Plugin-based security is addressing the symptom. Infrastructure security addresses the cause. AIOS is a good tool for what it does, but it's solving a problem that better hosting would prevent entirely.
The Bottom Line on All-In-One WP Security
All In One WP Security is the best truly free WordPress security plugin available. It provides comprehensive hardening, strong login protection, and reasonable firewall features without charging a fee.
It doesn't replace malware scanning or sophisticated threat detection. It hardens your installation and hopes that's enough.
For the right use case, AIOS is excellent. For organizations needing comprehensive protection, it's one layer in a multi-layer approach, not a complete solution.
But if your budget is zero and you need to address WordPress security, AIOS is where to start.
For a broader perspective on plugin-based security and its limitations, see our guide on WordPress security plugins.