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Price: Free, premium
Compatibility: iPhone, iPod touch, and iPad. Requires iOS 5.0 or later.
Evernote is often an app found on these types of lists, purely because the versatile nature of the app makes it a must-have tool for many users. The productivity app lets you take notes, capture photos, create to-do lists and record voice reminders. Notes can be indexed and are searchable, can be shared over email and social media, and the premium version can be secured with a PIN number.
Via: Apple App Store