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Head-to-head · Mobile Databases

AWS Amplify DataStore vs Realm

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score AWS Amplify DataStore #3 in Mobile Databases 9.0/10 Open source ✓ 1 of 1 features Visit AWS Amplify
Realm #8 in Mobile Databases 8.3/10 Open source ✓ 0 of 1 features Explore Realm

AWS Amplify DataStore leads on 0 checks, Realm on 0, and 1 is even. Who comes out ahead on the 1 yes/no, price and count check where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreAWS Amplify DataStore · 9.0/10
  • Most featuresAWS Amplify DataStore · 1 of 1

AWS Amplify DataStore scores higher on our rubric for mobile databases: 9.0 against 8.3 out of 10; our editors rank them #3 and #8.

AWS Amplify DataStore is the better fit for cross-platform apps needing cloud sync. Realm is the better fit for legacy object-oriented mobile apps with cloud sync.

  • AWS Amplify DataStore fits best

    Cross-platform apps needing cloud sync

  • Realm fits best

    Legacy object-oriented mobile apps with cloud sync

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Side by side

Feature AWS Amplify DataStore 9.0/10 Visit ↗ Realm 8.3/10 Visit ↗
At a glance
Editor score 9.0 8.3
Ranking #3 in Mobile Databases #8 in Mobile Databases
Best for Cross-platform apps needing cloud sync Legacy object-oriented mobile apps with cloud sync
Pricing model Free Free
Starting price Open source Open source
Free plan Not checked yet Not checked yet
Free trial — —
Deployment Cloud, Mobile Self-hosted, Mobile, Desktop
Platforms Web, iOS, Android iOS, Android, Windows, macOS, Linux
Support Tickets, Community, Docs Community, Docs
Integrations 4 integrations 1 integrations
Features AWS Amplify DataStore 1/1 · Realm 0/1
Offline mode ✓ (best) Not checked yet
Specs
Data synchronization Bidirectional Not checked yet
Mobile platforms iOS, Android, React Native, Flutter iOS, Android, Xamarin
Conflict resolution Automatic Not checked yet
SDK languages JavaScript, Swift, Java, Dart Java, Objective-C, JavaScript, Swift, Xamarin
Monthly sync limit Not checked yet Not checked yet
Our review
Pros
  • Offline-first reads and writes with persistent on-device storage
  • Bidirectional GraphQL synchronization through AWS AppSync
  • Automatic conflict handling with built-in and custom strategies
  • 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
Cons
  • Cloud synchronization depends on an AWS AppSync backend
  • Its ecosystem centers on AWS services and GraphQL
  • Conflict behavior may require choosing or creating a resolution strategy
  • 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

AWS Amplify DataStore is a developer library for persisting application data locally and synchronizing it with an AWS AppSync GraphQL backend. It is intended for cross-platform applications spanning web, iOS, and Android, with…

Read the review →

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…

Read the review →
  1. AWS Amplify DataStoreMobile Databases 9.0Open source
  2. RealmMobile Databases 8.3Open source

Strengths and trade-offs

  • AWS Amplify DataStore — where it wins

    • Offline-first reads and writes with persistent on-device storage
    • Bidirectional GraphQL synchronization through AWS AppSync
    • Automatic conflict handling with built-in and custom strategies

    Where it doesn't

    • Cloud synchronization depends on an AWS AppSync backend
    • Its ecosystem centers on AWS services and GraphQL
    • Conflict behavior may require choosing or creating a resolution strategy

  • Realm — 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

More comparisons

All mobile databases comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update