Personal Software Inspector (PSI)
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How It Works
System Requirements

How the Secunia PSI works

The Secunia Personal Software Inspector (PSI) works by examining files on your computer (primarily .exe, .dll, and .ocx files). These files contain non-specific meta information provided by the software vendor only. This data is the same for all users, and originates from the installed programs on your computer - never from their configuration. Please read the privacy statement available at the bottom of this page and through the Secunia PSI application for more details about how information from your computer is used by Secunia.

After examining all the files on your local hard drive(s), the collected data is sent to Secunia's servers, which match the data against the Secunia File Signatures engine (https://psi.secunia.com/) to determine the exact applications installed on your system.

Purpose of the Secunia PSI

The Secunia PSI is an invaluable tool for you to use when assessing the security patch state of software installed on your system. It constantly monitors your system for insecure software installations, notifies you when an insecure application is installed, and even provides you with detailed instructions for updating the application when available.

It is NOT the purpose of the Secunia PSI to detect whether your system has already been compromised or if local changes, settings, or missing requirements could cause the Secunia PSI to report incorrect results. The Secunia PSI relies on the meta-data of executables and library files. The Secunia PSI does NOT conduct an integrity check of the individual files, rather, it checks whether a specific program is vulnerable according to the reported version numbers and not whether the files have been compromised or replaced by other users or programs.

The Secunia PSI is not a replacement for other security measures such as anti-virus or personal firewalls, the Secunia PSI is a great supplement to other security measures such as anti-virus and personal firewalls as it helps preventing exploitation of often overlooked exposures.

Additionally, it is important to understand that the process of identifying insecure software installations on any system involves many different factors and, in rare cases, may result in incorrect detections. Should you encounter such a situation, please send us your feedback and all relevant information at support@secunia.com.

Privacy Statement


All communication between your system (The Secunia PSI) and the Secunia servers (psi.secunia.com) is conducted via an encrypted connection (SSL). Effectively protecting against eavesdropping of the data and the results being exchanged with Secunia.


All data sent to Secunia is treated as confidential.

The Personal Software Inspector collects unique text strings and data about executable files and installed applications on your system, including hostname and langroup, and Microsoft KB numbers. This data is analysed by the Secunia File Signature engine (psi.secunia.com) to determine the exact applications installed on your system. No other data is collected from your system.

This can in turn be used to provide you with a detailed report about the specific missing security related updates on your system. The data sent to Secunia is non-personal data only. The data is generic, standardised, and originates from installed programs on your computer.

All data will be deleted automatically no later than 12 months after you terminate using the program or immediately after you cancel your registration.

Secunia will not share or sell specific data about individuals with any third parties. Only aggregate statistical which can't be related directly to any individuals will be published and shared with third parties.

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