AnkiMobile Flashcards ($24.99) This hidden gem is great for anyone cramming for an exam. It's pricey, but this flashcard app is an unparalleled mobile tool for memorization and learning languages.
WordPress (Free) If you have a WordPress website or blog, you can use this app to write content on the go, edit your posts and webpages, and keep an eye on your comments and stats.
Thinkorswim (Free) Addicted to the stock market? Whether trading is your profession or a hobby, Thinkorswim lets you trade or just keep an eye on your stocks, options, and futures from anywhere.
Prosper Daily (Free) This colorful app helps get your finances in order. See how much your daily latte and scone are dwindling your cash reserves and keep an eye on your credit score for free.
30/30 (Free) Have a tendency to get off track? This task timer app lets you plan time slots for all your duties and urges you to move on when your time has run out.
2Do (Free) This highly customizable productivity app lets you generate checklists, reminders, projects, and notes with a flexible, easy-to-use interface—and they're all password protected!
Fantastical 2 ($4.99) This calendar and reminders app combined makes getting things done a cinch. Its natural language parsing is unrivaled, making it super easy to enter new tasks.
LastPass (Free) Having a good password manager keeps your data safe and saves you time. LastPass stores your passwords, generates new passwords, and autofills forms for you.
GoodReader ($4.99) This PDF reader app offers a whole toolbox at your fingertips, including file management and PDF annotation, and it plays well with a host of other apps.