Realm

7.3easy start · #6 of 27
in Mobile Databases

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you workyes

Runs on Android, iOS, Linux, Mac, self-hosted, Windows.

Realm is ranked #6 of 27 in mobile databases on The Geeks Club. It runs on Android, iOS, Linux, macOS, Self-hosted, Windows. There is a free plan.

Realm plans and pricing

All plans

Realm Database (open source) Free Free and open source under Apache License 2.0 mongodb.com · 4 Oct 2026

Compared on mobile databases

Mobile platforms: iOS, Android, Xamarin
SDK languages: Java, Objective-C, JavaScript, Swift, Xamarin

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The record

Product: Realm is an object database designed to run directly on phones, tablets, and wearables.
Use case: Realm provides local data persistence for mobile and edge applications.
Data model: Realm exposes data as objects that can be queried in code without an ORM.
Database features: The database supports relationships, generics, and vectorization.
Offline use: The Realm Platform documentation says apps can work through weak signal, offline, or outage scenarios.
Supported platforms: The JavaScript implementation supports React Native on iOS and Android, plus Node.js and Electron on Windows, macOS, and Linux.
SDKs: The official documentation lists Java, Swift, Objective-C, JavaScript, and .NET SDKs.
Integrations: Realm's former Device Sync connected data across users, devices, and a backend in real time.
Security: Realm Swift says data can be encrypted in flight and at rest.
License: MongoDB said it would offer the renamed Atlas Device SDKs as a free open-source project under Apache License 2.0.
Deprecation: The Realm JavaScript repository says MongoDB announced deprecation of Atlas Device Sync and Realm SDKs in September 2024.
Support: The Realm documentation directs users to its forums, Stack Overflow, and GitHub issues for help.
Developer tool: Realm Studio can open and edit local and synced Realms and administer Realm Object Server instances.
Maker: MongoDB acquired Realm and its technology in 2019 and renamed it MongoDB Atlas Device SDKs in 2023.
Price from: Free

Where it ranks on The Geeks Club

Best Mobile Databases in 2026#6 of 27

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Sources

github.com/realm/realm-js· checked 4 Oct 2026
realm.netlify.app/docs/· checked 4 Oct 2026
github.com/realm/realm-swift· checked 4 Oct 2026
mongodb.com/company/blog/product-release-announceme· checked 4 Oct 2026