AutoScreenCap as the name indicates, is a freeware app for Windows which can capture screenshots automatically. You can set the time interval for capturing screenshots and start the process. The app runs in the system tray and captures the screenshot at regular intervals as set. The app is portable and does not require any installation.
You can also set the JPG quality of the image capture and based on the quality, the output file size also increases.
This app can be useful in situations, when someone is using your PC for some time and you want to have a check on the windows opened or apps used. This app can capture screenshots at every second, so basically you can monitor all changes on the screen.
The app is simple and easy to use with minimal settings required.
Related Reading: Capture screenshots in Windows 8