Firebase
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Firebase powers thousands of apps with Firestore and its Realtime Database, both NoSQL stores that sync instantly across clients. Google's platform handles auth, hosting, and cloud functions too, so there's less to build yourself.
No-code builders like FlutterFlow and Bubble picked Firebase as their default backend because it's mature and integrates smoothly. If you're building on top of a popular no-code tool, Firebase is often already wired in and just needs your credentials.