aTstock SK증권 is a smart stock trading app developed by ATsolutions in partnership with SK증권. It is a free app that won the 'Smart App Award 2011' and the 'Technology Innovation Award' in the securities information sector. The app is available only for Android devices with OS 2.0 or higher, supporting all resolutions.

The app offers several features, including quick stock search, customizable homepage, desktop widget, easy order placement, and various stock market helper information. However, to use the order menu, you need to copy your PC's public certification to your smartphone. The app also requires a one-time authentication with your securities company ID and PW. Note that the app will not work on devices that have been modified or rooted.