Do not need to be downloaded or installed — web apps function in-browser

Easy to maintain — they have a common codebase regardless of mobile platform

Quicker and easier to build than mobile apps

Do not require app store approval, so can be launched quickly

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Will update themselves.
Updates to web apps don’t need to go through an app store meaning the user doesn’t have to manage updates manually. The newest version always loads when a user opens a web app.

Web apps, specifically, function like downloadable apps, but all from the comfort of your phone’s browser.