Fulmine Software/Alarms

 
Don't worry. It depends on your device, but usually location is determined based on cellular networks or Wi-Fi or both. Usually, GPS is not used so you should see no excessive battery consumption.

 
When using cellular networks or Wi-Fi to get your location it works indoors too!

Tasks and notes:

 
Create checkable task lists or just make notes with a few taps.

 
Convert them to alarms and back if necessary.

Customization:

 
About 40 colors and over 150 icons to assign will make your particular alarm, task or note unique.

 
Define your own or use one of over 30 predefined categories to filter content and quickly assign icons, colors, ringtone and other properties to alarms and notes.

 
Make your app personal by setting one of many available colorful app themes.