The best alternatives to Firebase Apps on Glitch are Supabase, Glitch, and Pathfix. If these 3 options don't work for you, we've listed a few more alternatives below.
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Supabase is an open-source backend-as-a-service that provides real-time databases, authentication, and API services. It enables developers to build and scale applications quickly without managing server infrastructure.
FlutterFlow is a low-code platform that empowers people to build beautiful cross-platform apps. With 3.0, in addition to mobile apps, you now can build & deploy web apps, add custom functionality, collaborate and extend the possibilities with the marketplace.