Kleio is a flashcard system for mobile phones and PCs. Here's what it does:

**Study Anywhere**
- There is a completely free Windows desktop app. (Get it at www.learnkleio.com)
- There is a completely free Windows 8 app, check the Windows Store.
- Use your Microsoft or Google account to sync all your devices. Everything works offline as well.
- Make flashcards in a browser with the Kleio website, or with any Kleio app.

**Get Flashcards**
- Make your own flashcards on phone or computer, or use Kleio's built-in flashcard exchange system to share and use pre-made flashcards. (At www.learnkleio.com)
- You can also use the Windows app to import from CSV files or from StudyStack.
- Use the bookmarklet to make flashcards online, from any text on any website, right in your browser.
- The bookmarklet and the WP7 app have Google Translate integration.
- Tap the huge StudyStack flashcard database from right in the app.

**Sophisticated Studying Method**
- A spaced repetition system tracks the difficulty of each flashcard and adjusts it as you learn.
- Harder cards are shown more often so you can study a huge number of flashcards efficiently.
- There's also a simple cram mode, which doesn't consider card difficulty and allows cards to be studied backwards.

**Rich Flashcards**
- Flashcards support all the usual formatting options, available when making flashcards online or on the desktop.
- Flashcards have optional prompts which you are shown before the answer.
- Flashcards can be zoomed.
- Autozoom makes sure your flashcards fill all available space no matter how much text they contain.

**Note: IMPORTANT**
- A simple one-time in-app-payment will unlock advanced features and remove the ads.
- You need a Microsoft or Google Account to use Kleio.