There are a number of Office alternatives for the iPad and iPhone for handling documents, spreadsheets and presentations, including options from the "big three" of :
- Google (Docs, Sheets, Slides)
- Apple (Pages, Numbers, Keynote)
- Microsoft (Word, Excel, PowerPoint)
Google's runs on more devices (iOS, Android, Web Browser, Chrome OS) and all free, but is more basic than its competition. Apple has the best (IMHO) interface and the most polished, costs on the Mac ($19.99 each), free for new iPads/iPhones ($9.99 each on older devices) and also runs in a Web Browser using iCloud. Microsoft excels (pun intended) on Windows desktops, but their iOS apps are read-only unless you get an Office365 account ($9.95/month or $99.99/year - ouch!).
No clear winner and your choice will depend on how you'll use it. Me, I just loaded them all.