This freeware app measures the startup time of Windows accurately. It provides users with an exact time measurement of how long it takes for Windows to start up completely.

Startup Timer is designed to measure two key metrics: the time it takes for Windows to show the Desktop, and the time it takes for the entire system to fully start up. It's worth noting that the latter metric is defined by the app as the moment when CPU usage drops below 5%.
Another notable feature of Startup Timer is its support for Windows Dark Mode. This makes the app easy on the eyes, even when used in low-light environments. Plus, if you're curious how your system start-up times stack up against other users, the app allows you to compare your results with those on the Leaderboard.
All in all, if you're looking for a no-nonsense, reliable way to measure your system's start-up time, Startup Timer is an excellent choice. It's free, lightweight, and does exactly what it promises to do.
Version 1.2:
What's new in version 1.2:
1) Improved accuracy of the detection for which apps make Windows startup slower.
2) Improved the accuracy of the CPU and RAM detection.
3) Minor user interface improvements.