Quick verdict
Instagram and Facebook both sit at the top of the Social app charts on Google Play, but they take very different approaches to the same job.
Instagram, built by Instagram, focuses on reels, stories, notes and dms in one polished social network. Facebook from Meta Platforms, Inc. instead leans into stay connected with friends, groups, marketplace and short-form reels. The two products are similar enough that comparing them feature-by-feature, rather than spec-by-spec, gives you a clearer answer.
This guide breaks down what each app does best, the use-cases each was designed for, a clean pros & cons matrix, and three high-intent FAQs people search before downloading. Both are free to install from the Play Store, so the real cost is your attention and habit — pick the one whose workflow matches yours.