The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Andy So:
NinjaToDo is a fun way to complete your to-do lists and level up your ninja as you complete more tasks. Create different categories to organize your to-do items and check them off when you're done. Be inspired by over 200 motivational quotes from dozens of the world's most successful people. Level up your ninja as you complete more items. -Great for entrepreneurs, employees, jobseekers, students and everyone looking for a fun way to organize their to-do lists. - Organize lists by categories and see all of your open tasks on one page - Be inspired by over 200+ motivational quotes ranging from the world's greatest philosophers to the most accomplished businessmen like Aristotle, Warren Buffett and more - Track your progress as you complete more to-do items and level up your ninja on your quest to become the greatest of all time- Optimized for Retina Display with 2x images