Realm Reviews in 2026

Audience

Mobile developers interested in a tool to create offline-first applications with real-time data synchronization capabilities

About Realm

Realm is a mobile-first, open source object database designed to run directly inside phones, tablets, and wearables. It provides a simple, object-oriented data model that eliminates the need for an ORM, allowing developers to define models as regular classes in languages like Swift, Java, Kotlin, C#, JavaScript, Dart, and C++. Realm's architecture ensures high performance and low memory usage by employing a zero-copy design, lazy loading, and multi-version concurrency control (MVCC) for thread-safe operations. It's live objects and collections automatically update across threads, enabling reactive programming patterns. Realm supports relationships between objects via links and backlinks, facilitating complex data structures. Developers can utilize tools like Realm Studio to inspect and manipulate local Realm databases and integrate Realm into various platforms, including React Native, Flutter, Xamarin, and Node.js.

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Core Data

Use Core Data to save your application’s permanent data for offline use, to cache temporary data, and to add undo functionality to your app on a single device. To sync data across multiple devices in a single iCloud account, Core Data automatically mirrors your schema to a CloudKit container. Through Core Data’s Data model editor, you define your data’s types and relationships, and generate respective class definitions. Core Data can then manage object instances at runtime to provide several features. Core Data abstracts the details of mapping your objects to a store, making it easy to save data from Swift and Objective-C without administering a database directly. Core Data’s undo manager tracks changes and can roll them back individually, in groups, or all at once, making it easy to add undo and redo support to your app. Perform potentially UI-blocking data tasks, like parsing JSON into objects, in the background.

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CloudKit

CloudKit is a cloud framework that enables developers to store app data in iCloud and keep it synchronized across devices and the web. It offers automatic syncing across several devices and web platforms. By organizing apps in containers, CloudKit ensures each app's data remains siloed, preventing entanglement with other apps. Specialized databases and zones allow for easy separation of app information by access type or function. Developers can configure fields in private CloudKit databases to be encrypted, ensuring data protection in storage and during transport. The CloudKit Console provides a web-based control panel to view server activity, manage containers, maintain database schemas, and edit test data throughout the development lifecycle. It also offers telemetry charts to measure performance, reliability, and usage, as well as logs for analyzing app performance while maintaining user privacy.

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Pricing

Starting Price:

Free

Free Version:

Free Version available.

Integrations

API:

Yes, Realm offers API access

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Ratings/Reviews

Overall 0.0 / 5

ease 0.0 / 5

features 0.0 / 5

design 0.0 / 5

support 0.0 / 5

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Product Details

Platforms Supported

Cloud

Training

Documentation

In Person

Support

Phone Support

Online

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