Free security software

Stay secure by updating insecure programs
on your computer with the Secunia PSI

7 day trial

Free instant download
of the Secunia PSI

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PSI runs on Microsoft Windows 10, 8.1, 8, 7 and Vista


The Secunia PSI is a free computer security solution that identifies vulnerabilities in applications on private PCs

vulnerability intelligence

Available in 8 languages

English, French, German, Spanish, Arabic, Danish, Norwegian and Dutch.

Software Scanning

Automatic Updates

Automates the updates for your insecure programs, making it a lot easier for you to maintain a secure PC.

Extensive Program Coverage

Regular Scanning

The Secunia PSI automatically and regularly scans your PC for insecure programs


All features

The Secunia PSI explained

The Secunia Personal Software Inspector (PSI) is a free computer security solution that identifies vulnerabilities in applications on your private PC. Vulnerable programs can leave your PC open to attacks.

Simply put, it scans software on your system and identifies programs in need of security updates to safeguard your PC against cybercriminals. It then supplies your computer with the necessary software security updates to keep it safe. Using a scanner like Secunia PSI 3.0 is complementary to antivirus software, and as a free computer security program, is essential for every home computer.

Secunia SC2012

Watch our 2-minute introduction to Secunia PSI

=PC World

"Secunia PSI won't do away with the need to run a good antivirus program and firewall on your PC. But it provides a solid layer of free protection that no PC should do without"

Click here to read more

Zd net

"Number one is the Secunia Personal Software Inspector, quite possibly the most useful and important free application you can have running on your Windows machine."


"At the moment, Secunia PSI can deliver security updates for more than 3,000 software pieces, which places it at the top of the list of security scanners."

Read the five star review here

Visit Support

Looking for Customer Support, FAQ, more Product Information or Documentation?

Visit the Secunia PSI support page