Realm vs ObjectBox: What are the differences?

Developers describe Realm as "Realm makes it easy to build reactive apps, realtime collaborative features, and offline-first experiences". The Realm Mobile Platform is a next-generation data layer for applications. Realm is reactive, concurrent, and lightweight, allowing you to work with live, native objects. On the other hand, ObjectBox is detailed as "The fast and easy object-oriented database for small devices". It is for developers who look for performance and ease of use. We are committed to providing you with the easiest APIs for you to keep your code short and maintainable. No SQL under the hood-Simply faster. Unlike other databases, it has been built from the ground up using key-value storage instead of column storage. The resulting performance is 10x faster than the leading alternative, we welcome you to try it yourself. It is fast regardless of the amount of data or operating system you are using.

Realm and ObjectBox can be categorized as "Mobile Database" tools.

Some of the features offered by Realm are:

• Feels like Home - Realm’s data structures look like the Objects and Arrays of your language, but provide additional features such as: querying, relationships & graphs, thread safety, and more.
• Memory-Efficient - Realm is not built on SQLite. Instead, a custom C++ core is used to provide memory-efficient access to your data by using Realm objects, which usually consume less RAM than native objects.
• F-F-Fast! - Realm offers extraordinary performance compared to SQLite and other persistence solutions.

On the other hand, ObjectBox provides the following key features:

• 10x faster than any alternative
• Reduces cloud costs up to 60%
• Supports Linux, Windows, Mac/iOS, Android, Raspbian, etc. Embedded or Containerized

Realm is an open source tool with 14K GitHub stars and 1.83K GitHub forks. Here's a link to Realm's open source repository on GitHub.