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Realm

Free#8 of 26 in Mobile Databases

Realm: A capable object-oriented mobile database now discontinued after Atlas Device SDK end-of-life. Ranked #8 of 26 in Mobile Databases by our editors (8.3/10); pricing: Open source; best for legacy object-oriented mobile apps with cloud sync.

8.3/10Editor score

Explore Realm

Realm8.3 Explore Realm

At a glance

Editor score
8.3 / 10
Pricing
Open source
Best for
Legacy object-oriented mobile apps with cloud sync
Paid from
Free
Facts checked
21 Sep 2026

Where it wins
- Local persistence with reactive, object-oriented data access
- Device-to-cloud synchronization with MongoDB Atlas integration
- SDK coverage across iOS, Android, Xamarin and multiple languages
Where it doesn't
- Atlas Device Sync and Atlas Device SDKs reached end-of-life
- Not suitable for new projects requiring ongoing platform support
- Realm branding and documentation now point to legacy technology

Our verdict on Realm

Realm was an open-source mobile database and synchronization technology for reactive applications. It provided local mobile data persistence, object-oriented database access, reactive application data access, and device-to-cloud synchronization. Its platform coverage included iOS, Android, Windows, macOS, and Linux, while its mobile specifications included iOS, Android, and Xamarin. The product was aimed at developers building object-oriented mobile apps that needed local data access alongside cloud synchronization.

Its main technical strength was the combination of local persistence, reactive access, and synchronization in one mobile-oriented technology. SDKs and libraries covered Java, Objective-C, JavaScript, Swift, and Xamarin, supporting several common mobile development approaches. Realm Studio added a way to inspect Realm database files, which could help developers examine stored data during application work. MongoDB Atlas was the listed integration, giving the product a direct connection to MongoDB’s cloud ecosystem. MongoDB renamed Realm as MongoDB Atlas Device SDKs in 2023 and continued the project under the Apache 2.0 license.

The decisive limitation is lifecycle status. MongoDB announced that Atlas Device Sync and the Atlas Device SDKs reached end-of-life on September 30, 2025, so Realm should be considered discontinued for current software selection. It may remain relevant when maintaining an existing application that already depends on Realm data structures or SDKs, but it is not a suitable foundation for a new mobile database project that needs an active roadmap. Teams choosing a current platform should look beyond Realm, while teams managing legacy object-oriented mobile apps may still need to understand its persistence, synchronization, SDK, and inspection model.

Your product? Our editors can test Realm in depth and publish a review, labelled as paid · from $149/mo →

Realm pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on realm.github.io

Realm fact sheet

Free plan	Not verified
Paid from	Free
Offline mode	Not verified
Data synchronization	Not verified
Mobile platforms	iOS, Android, Xamarin
Conflict resolution	Not verified
SDK languages	Java, Objective-C, JavaScript, Swift, Xamarin
Monthly sync limit	Not verified
Deployment	Self-hosted, Mobile, Desktop
Platforms	iOS, Android, Windows, macOS, Linux
Support	Community, Docs
Integrations	1 integrations: MongoDB Atlas
Pricing	Open source
Website	realm.github.io
Facts checked	21 Sep 2026

Realm integrations

Realm lists 1 integrations on its own site.

MongoDB Atlas

Alternatives to Realm

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Realm vs the competition

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Featured on iTechGuides

Realm is listed in our Mobile Databases directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update