Best Offline-First Databases for iPhone

​WatermelonDB is a reactive database framework designed to build powerful React and React Native apps that scale from hundreds to tens of thousands of records while remaining fast. It ensures instant app launch regardless of data volume, supports lazy loading to load data only when needed, and offers offline-first capabilities with synchronization to your own backend. It is multiplatform. Optimized for React, it allows easy integration of data into components and is framework-agnostic, enabling the use of its JavaScript API with other UI frameworks. Built on a robust SQLite foundation, WatermelonDB provides static typing with Flow or TypeScript and optional reactivity through an RxJS API. WatermelonDB addresses performance issues in complex applications by loading nothing until requested and performing all querying directly on SQLite on a separate native thread, ensuring most queries resolve instantly.

Actian Zen is an embedded, high-performance, and low-maintenance database management system designed for edge applications, mobile devices, and IoT environments. It offers a seamless integration of SQL and NoSQL data models, providing flexibility for developers working with structured and unstructured data. Actian Zen is known for its small footprint, scalability, and high reliability, making it ideal for resource-constrained environments where consistent performance and minimal administrative overhead are essential. With built-in security features and a self-tuning architecture, it supports real-time data processing and analytics without the need for constant monitoring or maintenance. Actian Zen is widely used in industries like healthcare, retail, and manufacturing, where edge computing and distributed data environments are critical for business operations.

Low code without limits. Quickly build web and mobile applications from pre-built components in a visual canvas. Enhance existing and create new applications with greater agility to keep pace with business demands. In-product guided tours, reusable components and templates, one-click cloud builds and easy data integration with visual data mapping to maximize productivity. Integrate to any backend data source and orchestrate data collection & transformation across multiple systems. Design beautiful applications for any audience across any device without limits on the user experience. Accelerate development using 100+ pre-built native UI widgets for mobile and web. Use the full spectrum of native mobile app, responsive and progressive web app (PWA) functionality to deliver the best possible experience, performance, and security. Build native omni-channel experiences using a single design canvas across mobile, web, wearables, and more.