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Is bootstrap proper for building mobile app?

Bootstrap is in fact mobile-first and responsive by default, making it perfectly suitable for use on mobile devices.

In your case, Bootstrap may or may not be what you're looking for. It's well supported and easy to use, but may be a little slower than you'd like, and can be a little constricting for mobile-only apps given that it is designed to work on both desktop and mobile.

This article may be useful to you - it has a comparison of several frameworks and the pro/cons of each.