iPad Apps to NoSQL database

GUN is an open-source, decentralized, and distributed graph database with real-time synchronization capabilities. It simplifies building collaborative and offline-first applications by providing peer-to-peer data replication and a flexible data model.

Heroic Labs offers Nakama, an open-source, distributed server for social and real-time games and apps. It provides a powerful suite of backend features including user authentication, social features, real-time multiplayer, and data storage, enabling developers to build scalable and engaging online experiences.

Back4App is a robust backend-as-a-service (BaaS) built on Parse Server, offering a scalable and flexible platform for mobile and web application development. It simplifies backend tasks like databases, APIs, and cloud functions, allowing developers to focus on the frontend.