Control your CPU
from your browser.
Stress test, benchmark, throttle, and monitor your CPU. Works on Windows, Mac, and mobile — no installs, no sign-up.
What brings you here?
As seen on
Pick the right tool for the job
Eight free browser-based tools. Each card tells you exactly when to use it.
Most PopularCPU Stress Test
Use this if You want to test if your CPU is stable after overclocking or building a new PC
Retro GamingSlow Down PC
Use this if Your retro game runs too fast — characters move at double speed or the game is unplayable
AccessibilityAccessibility Tools
Use this if You need your computer to run slower for motor disability or fine motor control reasons
Retro Game Fix
Use this if You want game-specific throttle settings for Fallout 2, Grim Fandango, Commandos and 200+ others
CPU Benchmark
Use this if You want to score your processor and see how it compares to other systems
CPU Load Test
Use this if You need to hold a precise % CPU load for power consumption or thermal profiling
CPU Temperature
Use this if You want to check if your CPU is running too hot and understand safe temperature ranges
Blog & Guides
Use this if You want in-depth guides on retro gaming, overclocking, CPU performance, and accessibility
Pick your tool
Choose from the list above based on what you need — retro gaming, stress testing, or accessibility.
Set it up
Each tool has simple controls. Pick your settings — threads, load %, game preset — then hit Start.
See results live
Watch the CPU gauge and chart update in real time. Stop whenever you're done. No data is stored.
Ready to test your CPU?
No account, no download, no cost. Works in any modern browser on any device.