Word works with iOS devices and the iPad Pro. You can read Word documents on the iPad Pro for free. To create and edit docs, you need a qualifying Office 365 subscription. You can give it a try for free for 30 days.
There are levels of Word that relate to free reading versus editing and creating using a subscription.
On iPhone, iPad Air, and iPad mini, the core Word experience, including viewing, creating, and editing documents, is free. You can pay for the full Word experience with a qualifying Office 365 subscription. On iPad Pro, you need Office 365 to create and edit documents.
The latest update to Word update adds the following:
• Box works with Office: Your file storage options are growing! Now store and access your Office files on Box.
• Discover more Office apps: Word now makes it easy for you to discover and quickly install all the Office apps available for your iPhone and iPad.