Show HN: Ringo - Building access the way you want it

Long time lurker, first time poster.

Around Christmas, my apartment building changed over their buzzer system to call a dedicated number instead of a phone in the unit. This made coordination of inviting guests over difficult for me and my girlfriend, as we had to choose whose number to use -- an idea born.

This is my first venture into entrepreneurship, so I'd really like to hear any feedback. For those curious, I'm using Play 2.0.x on Heroku. Twilio's the phone provider and Stripe's the payment provider. I started this project to learn some new things and break out of my J2EE dayjob doldrums.

Since buzzeromatic folded, there doesn't seem to be anything else in this space - although the real challenge now is how to get it to the consumers who'd find it useful. I'm thinking my main markets are college-aged people with roommates, as well as down-sizing couples moving into condos.

Thanks for taking a look!