IceCream
A Swift library that automatically syncs Realm Database with Apple CloudKit for seamless offline-first data synchronization across Apple devices.
What is IceCream?
IceCream is a Swift library that synchronizes Realm Database with Apple CloudKit, enabling automatic data syncing across Apple devices. It solves the problem of keeping local Realm databases in sync with iCloud while maintaining offline-first capabilities and reactive programming patterns. The library handles complex scenarios like relationship syncing, large file transfers, and delta updates automatically.
iOS/macOS/tvOS/watchOS developers building offline-capable applications that need seamless data synchronization across devices using Realm and CloudKit. Particularly useful for developers who want to avoid writing complex sync logic themselves.
Developers choose IceCream because it provides a simple, automatic synchronization solution between Realm and CloudKit with minimal code. Unlike manual implementations, it handles complex edge cases like relationships, asset syncing, and soft deletions out of the box while maintaining Realm's performance benefits.
Overview
Sync Realm Database with CloudKit
Use Cases
Best For
- Building offline-first iOS apps with automatic cloud sync
- Syncing Realm databases across multiple Apple devices
- Handling large file synchronization in Realm-based applications
- Implementing soft deletion patterns in synced databases
- Managing complex object relationships in synchronized data models
- Debugging and monitoring Realm-CloudKit synchronization issues
Not Ideal For
- Cross-platform applications needing sync beyond Apple ecosystems (e.g., Android or web support)
- Projects requiring real-time synchronization with custom backend servers instead of CloudKit
- Teams that prioritize extensive, hand-holding documentation for complex setups
- Applications with extremely high data transfer volumes where CloudKit's free quotas might be restrictive
Pros & Cons
Pros
IceCream abstracts away complex sync logic by automatically pushing Realm changes to CloudKit with minimal code, as emphasized in its 'works like magic' philosophy.
It handles Realm relationships including to-one and to-many associations out of the box, which simplifies syncing interconnected data models.
Uses CreamAsset to sync files over Realm's 16MB limit by storing them locally and uploading as CKAssets, optimizing for media and large data.
Seamlessly works across iOS, macOS, tvOS, and watchOS, leveraging native Apple frameworks for consistent sync experiences.
Cons
The README explicitly lists 'Complete Documentation' as an unchecked feature, which can slow onboarding and increase debugging time for complex issues.
Tightly coupled with Realm and CloudKit, making migration difficult and limiting flexibility if you need to switch databases or cloud services.
Requires enabling iCloud capabilities, background modes, and remote notifications in Xcode, adding initial configuration complexity beyond simple integration.
Frequently Asked Questions
Related Projects
MMKVAn efficient, small mobile key-value storage framework developed by WeChat. Works on Android, iOS, macOS, Windows, POSIX, and OHOS.
RealmRealm is a mobile database: a replacement for Core Data & SQLite
WCDBWCDB is a cross-platform database framework developed by WeChat.
SQLite.swiftA type-safe, Swift-language layer over SQLite3.
Found a gem we're missing?
Open-Awesome is built by the community, for the community. Submit a project, suggest an awesome list, or help improve the catalog on GitHub.