Firebase is described as 'Provided by Google, is a backend service and application development platform. It uses AI, cloud infrastructure, and cross-platform SDKs for efficient app development. Firebase offers tools and infrastructure for app creation and business growth' and is a popular backend as a service in the development category. There are more than 100 alternatives to Firebase, not only websites but also apps for a variety of platforms, including Self-Hosted, Linux, SaaS and Mac apps. The best Firebase alternative is Supabase, which is both free and Open Source. Other great sites and apps similar to Firebase are TrailBase, Directus, Appwrite and PocketBase.
Backendless is user friendly, has tons of features for the backend and database, utilizes visual programming, and has a fully integrated UI Builder.