SocialCompare
Link
Google DocsMicrosoft WordApple's Pages
Cross platform?YesYes- With iWork for iCloud, or just simply by using the website.
Is it free?YesNoYes
Can you work offline?YesYesYes
How many people can you invite to the document?Up to 100Up to 500Up to 100
Does it have an app?YesYesYes