Alert me if I'm in the red

Beeminder is a tool for data nerds to commit to progress towards goals. You specify any graphable goal (these Applets assume you've created one) and Beeminder plots your progress. Keep your datapoints on the right side of the Bright Red Line or Beeminder will literally charge you money.
Notifications work seamlessly on any Android or iOS device with the IFTTT app installed. Get the information you want, when you want it.