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Tech riderRev. 4 Oct 2026

Realm

Ch 087.5of 27 Mobile Databases
  1. 1Runs onAndroid, iOS, Linux, Mac, self-hosted, Windows
  2. 2CostsFree plan
  3. 3Mobile platformsiOS, Android, Xamarin
  4. 4SDK languagesJava, Objective-C, JavaScript, Swift, Xamarin
4 lines stated Written from the maker's own pages: realm.github.io, mongodb.com
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The Realm homepage

Overview

Realm is ranked #8 of 27 in mobile databases on Specifiction. 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, Xamarinrealm.github.io
SDK languages
Java, Objective-C, JavaScript, Swift, Xamarinrealm.github.io

Facts

Product
Realm is an object database designed to run directly on phones, tablets, and wearables.github.com · 4 Oct 2026
Use case
Realm provides local data persistence for mobile and edge applications.github.com · 4 Oct 2026
Data model
Realm exposes data as objects that can be queried in code without an ORM.github.com · 4 Oct 2026
Database features
The database supports relationships, generics, and vectorization.github.com · 4 Oct 2026
Offline use
The Realm Platform documentation says apps can work through weak signal, offline, or outage scenarios.realm.netlify.app · 4 Oct 2026
Supported platforms
The JavaScript implementation supports React Native on iOS and Android, plus Node.js and Electron on Windows, macOS, and Linux.github.com · 4 Oct 2026
SDKs
The official documentation lists Java, Swift, Objective-C, JavaScript, and .NET SDKs.realm.netlify.app · 4 Oct 2026
Integrations
Realm's former Device Sync connected data across users, devices, and a backend in real time.github.com · 4 Oct 2026
Security
Realm Swift says data can be encrypted in flight and at rest.github.com · 4 Oct 2026
License
MongoDB said it would offer the renamed Atlas Device SDKs as a free open-source project under Apache License 2.0.mongodb.com · 4 Oct 2026
Deprecation
The Realm JavaScript repository says MongoDB announced deprecation of Atlas Device Sync and Realm SDKs in September 2024.github.com · 4 Oct 2026
Support
The Realm documentation directs users to its forums, Stack Overflow, and GitHub issues for help.realm.netlify.app · 4 Oct 2026
Developer tool
Realm Studio can open and edit local and synced Realms and administer Realm Object Server instances.realm.netlify.app · 4 Oct 2026
Maker
MongoDB acquired Realm and its technology in 2019 and renamed it MongoDB Atlas Device SDKs in 2023.mongodb.com · 4 Oct 2026

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Where it ranks on Specifiction

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Sources