Best App For Tasks and Reminders

[Sean White]

What apps/software do you all use to enter tasks and get reminders? I'm looking for something that will sync with my Galaxy phone and Windows 8 (soon to be 10) PC. I'd like the reminders to pop up on both. If there's one that will smack me across the face and tell me to get it done even better. Just kidding, I don't need that much reminder but you get the picture. Thanks in advance for any suggestions.