At its Worldwide Developers Conference today, Apple announced its answer to Google Docs, iWork for iCloud. This is a browser-based version of Apple’s productivity suite, iWork, which works on a Mac or a PC.

Pretty straight forward. It’s iWork, but cloud-based. It works for Pages, Numbers and Keynote. It also works on non-Apple browsers, and on Windows. Public beta will be available this year.

Ahead of the unveiling, CEO Tim Cook said that iCloud is the fastest-growing cloud service ever. It’s up to 300 million accounts since launch.

“It took Facebook five years to reach this many accounts,” he noted.

iTunes for iCloud users have re-downloaded their content 35 billion times. Game Center, has 240 million users, he said. There have been 800 billion iMessages sent, and 7.4 trillion push notifications delivered.