Backstory: As we age, unfortunately sometimes we must take medicine to deal with ailing issues. My grandmother takes 8 pills some days, it's hard to remember.

The Idea: An app that would vibrate to remind users to take their pills.

Deep Dive: You would build a simple scheduling app that would buzz to remind users to take their pills. Pairing with a bluetooth device will help remind users as well.

Taking this to the next level, you can ask the user for a quick check/tap confirmation. This would give the user's loved ones peace of mind that they are taking their medication.

Validation: There are alarm clocks dedicated to reminding people to take their pills.

Monetization: You could offer the app for free and then charge a small subscription fee for everyone that gets notified.