Notify.it is the free easy to use application that notifies you within 30 seconds when your favorite topics pop up.
Done in 3 quick and easy steps:
1. Add your favorite subreddit
2. Add your keyword
3. Tap NOTIFY ME
Features:
√ Set and forget: notify.it will continue to function if the app is closed, even if your device is off!
√ Immediate notification for the posts you care about, as they happen
√ Direct links to posts
√ Matches stored for later viewing
√ Simple easy to use UI