Couple years ago during Perk TV prime you could run the app on 5 phones and get a couple hundred dollars per month...now that figure is much less & you need to check that you're watching the ads every couple hours instead of letting it run while away.  

Any other good apps out there... Or any simple passive money makers to get a $200-$300 per month

You can install robin hood on your phone and trade stocks. No brokerage fees.  Make sure you understand your technical analysis before trading stocks.  Do paper trading first.