Test the stability of your PC
OCCT (OverClock Checking Tool) is a comprehensive system stability testing and monitoring software designed for gamers, PC enthusiasts, and overclockers.
OCCT v17 Stable Now Available: New Memory Test Presets, Launcher and optimizations
2026-06-30
OCCT v17 Beta: New Memory Test, Major Optimizations, and A Community Contest
2026-05-22
OCCT is heading to Computex Taipei 2026
2026-05-21
Introducing OCCT
Thorough and reliable testing
OCCT is an all-in-one stability testing and monitoring solution trusted by millions of users worldwide. Whether you're a gamer pushing your hardware to its limits or an enthusiast ensuring long-term system reliability, OCCT provides the tools you need to test, monitor, and validate your system with confidence.
Quality & Stability
Built on more than 20 years of development and refinement, OCCT delivers a stable and reliable testing tool used by millions of users worldwide.
High Performance
OCCT is engineered for efficiency, delivering fast and accurate testing while minimizing system overhead. It is designed to fully leverage your hardware without unnecessary resource usage.
User Friendly
Designed with usability in mind, OCCT offers an intuitive interface that makes advanced stability testing simple for users of all experience levels.
OCCT features
Quality and innovation
Offline and portable
Use it anywhere, anytime
Offline and portable
OCCT is a portable application that requires no installation, making it easy to run directly from any location on your system or even from an external drive.
This portability ensures that you can use OCCT on multiple systems without the need for repeated installations, saving time and effort.
Additionally, OCCT operates fully offline, allowing you to perform tests and monitor your system's performance without requiring an internet connection. This feature is particularly useful for testing systems in secure or isolated environments.
Show off your machine
Benchmark leaderboards
OCCT isn't just a powerful stress testing tool, it's also home to a thriving tech community. Compare your benchmark results on global leaderboards, compete with users worldwide, and see how your system stacks up.
Optimize your performance
System tuning
Built in collaboration with Intel, our System Tuning tool allows you to optimize your Intel CPU performance with ease. With just a few clicks, you can adjust your system settings to achieve the best possible performance while maintaining stability and reliability.
Support OCCT's development
Patreon membership and perks
OCCT is free for personal use. To support ongoing development, a subscription is available via Patreon. Members enjoy unlimited test duration, no wait time between tests, and access to test reports and stability certificates. Subscriptions can be cancelled at any time.
Ready for all gamers
Also on Steam
Easy to find and quick to download, OCCT can be launched directly from your Steam library on any machine. If you prefer non-recurring subscriptions, you can also purchase one month of OCCT Supporter on Steam to enjoy all premium perks.
Make it yours
Choose your theme
Personalize your OCCT experience with a selection of branded skins.
Choose your favorite look or the brand that best represents your system.
Be part of the community
Join us on Discord
Connect with other OCCT users, share your experiences, and get support from our team on our official Discord server.