Absolutely depends on how you present it. If you put down what you did, what problems you solved, what you accomplished (use lots of verbs and don't start with "I": ie Developed database accessed by other 1000 users, or Developed mobile application for user sign-ups using JS for cross-platform compatibility).
If you put down "Founded a startup with friends and we are currently in stealth mode" then no company will wantto take you on as they (and you) do not know where you will be in 6 months.
The first is past accomplishments applicable to the position offered. The second is a currently active status that says you are maybe unavailable.
Also, you will want to be very careful about which company you apply to and how they treat your offtime accomplishments. Some look to take a piece of all that you develop.