Yep, just a dude with a Macbook over here... =) I'm pulling from the CoinMarketCap public API, so thankfully no, I didn't have to list all those coins myself! I've used CoinMarketCap for years, but it's not the best on mobile and I wanted to be able to know what my coins are worth, too. The main view at mycoinbag.com updates every 5 minutes.