Google Docs

Many people think of Google Docs as a desktop tool, but it works better on iPhone than you might expect. It’s especially useful if your work involves collaborating and sharing with others, editing shared drafts, reviewing comments, or making quick changes on the move. 

Real-time collaboration is still one of its biggest strengths, but it also handles Word files and lets you can download your files in many different formats, too. This makes it even more practical if you use different operating systems or work with people who have Android phones or Windows computers. If you ever need to stay productive away from your laptop, Google Docs is one of the most useful apps to keep ready.