This brand name is a playful take on the word "retina".
The name "retiny" has only six letters and three syllables. Three syllable names are used by established brands like Grammarly, Delicious and Armani.
Retiny.com is a dot com domain. Dot com domains are the most prestigious top-level-domain in the world, used by famous websites like google.com. Once secured, a dot com all but guarantees no-one else can outrank you for your own name in the long run.
This domain was first registered in October 2016. Older domains have an advantage when ranking in search engines.