Por Favor's a to do app with a bit of a difference. Instead of you adding tasks to it, it's populated by your friends + family. A lot of the time, people ask for favours and I say "Yeah sure" and forget about it instantly. With Por Favor, I can say yes when they ask me, and it'll automatically remind me when the task needs doing.
If there's one feature a todo list shouldn't have, it's the ability for others to add things to it. That already exists and it's called email.
Por Favor is about making things easy. You say 'yes I can do that' and it reminds you when it's time to act. Nothing more, nothing less.