This contemporary and professional name is well suited to a hardware or security brand.
The name "stacksync" has nine characters and only two syllables. Two-syllable names are highly rare and highly sought after. Established brands using two syllable names include Visa, Delta and Honda.
Stacksync.com is a dot-com domain. Dot com domains are the most valued top-level-domain in the world, used by famous websites like facebook.com. When most people think of a website, they think of a dot-com.