By Friday afternoon, the trio of apps occupied the top three spots on the App Store's real time list of most downloaded free apps.
Honestly, the free versions may meet the needs of a lot of people, because displaying documents is one of the most useful functions of the apps.
Pulling up documents is quick and easy, especially if they're stored on a user's OneDrive account, which comes with 20 gigabytes of cloud storage space as part of the Office 365 subscription.