This great 99-cent app will inform you of any no-no in progress in whatever inning you want choose. (To me, it’s worth tuning into MLB TV for teams you don’t care about when a game reaches the 7th inning without a hit.) The app will also let you set a different inning for teams you care about, so if I happen to be missing a Mets or Padres game on a particular night I’ll get a heads up in the fifth.)
The app’s website is http://nohitteralerts.com/ if you want to learn more. There’s no Android version as of yet.