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The latest WritePad also cooperates with Facebook Dropbox, Google Docs, iTunes, SMS services, and Twitter clients. It's one of a growing generation of unrelated apps that allow interaction with third-party software. WritePad, PhatWare's top selling app (according to its own stats), was developed entirely independently of Evernote and its other sync companions. But the separate developers allow cross access to their software to make both more appealing to users.