Crast
Stay active, on your terms.
Built for people who get things done.
Crast is a lightweight background tool that keeps your activity steady and predictable. Pick an intensity level, or set your own exact numbers, and just let it run.
Runs 100% locally · Auto or manual control · One-click hotkeys · Free updates for life
Three levels. One tap.
Every level runs on the same proven engine, just aimed at a different target. It naturally drifts a bit so it never looks flat.
Low
~45% overall activity
Mid
~65% overall activity
High
~85% overall activity
Built to feel natural
Every part of Crast is built to feel like normal human activity, not some robotic loop, so it stays undetectable to activity trackers when you set it up thoughtfully.
Full mixer control
Open the control panel and set exact Mouse %, Keyboard %, and Overall % with sliders. There's also a Constant/Range toggle if you want some natural variation.
Browser tab switching
Switches tabs in your real, multi-tab browser windows, Chrome, Edge, Brave, Opera, Vivaldi, and Firefox, on whatever interval you want. Fully adjustable, or just turn it off in Manual mode.
App switching
Rotates the active window across everything you have open, not just browsers. Set your own interval in Manual mode, or let each Auto Mode level set its own pace automatically.
Remembers your setup
Manual mode's slider values save automatically and come right back the next time you launch, even after a full reboot.
Global hotkeys
Switch levels, open the mixer, or shut everything off from anywhere. No need to go hunting for a window first. A tray icon always shows what's running.
Hidden by default
No window pops up during normal use. Everything's controlled through hotkeys and a small tray icon.
Built for people who get things done
Crast is for freelancers, remote workers, testers, developers, and presenters, basically anyone who wants more control over repetitive desktop activity while they focus on the actual work. Not all real work looks like nonstop typing, and we don't think it should have to.