The conflict-free replicated data type (CRDT) data structure enables smooth peer‑to‑peer offline replication and online sync in distributed systems. 

When multiple offline Ditto stores make concurrent updates to the same CRDT object, the CRDT merge mechanism remediates the data collision so that, when sync takes place, they converge to a consistent state. For more information, see the 

Following are the types of CRDTs you can use in Ditto:

For an overview of documents, including fields and key-value pairs, see 

The following table provides a quick overview of the advanced data types you can use in Ditto, along with their guiding principles for conflict resolution, or 

, a brief description, and a common usage scenario:

If you prefer learning by doing, see Jake Lazaroff's blog for a hands-on tutorial: "

The following table provides an overview of the CRDTs and associated behavior for a given operation:

Query Syntax

Data Types

linux_aarm_supported_version

android_supported_version

ipados_supported_version

ios_supported_version

windows_x64_supported_version

mac_supported_version

linux_x64_supported_version

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ditto

SDK v4.4 (and earlier)

Welcome to Ditto Docs - V4.4

Onboarding

Core Components

Sync Overview

Data Structures and Types

CRUD Fundamentals

Authentication and Initialization

Ditto Basics

Compatibility with Swift

Installing Swift SDK

Tutorials in Swift

Quick Tips for Swift

Release Notes

API Reference

Swift SDK

Compatibility with Kotlin

Installing Kotlin SDK

Kotlin

Compatibility with JavaScript

Installing JavaScript SDK

Javascript - Node.js

Compatibility with Java

Installing Java SDK

Java for Android SDK

Compatibility with C#

Installing C# SDK

Authentication Server

C# SDK

Compatibility with C++

Installing C++ SDK

C++ SDK

Compatibility with Rust

Installing Rust SDK

Setting Up

Rust SDK

SDK Setup Guides

Counter

Attachment

Finding and Observing

Upserting and Updating

Evicting and Removing

Best Practices for CRUD

CRUD Operations

Data Sync

Fields and Key-Values

Identifiers: Default and Custom

Collections

Version Control

Complex Structures

Evaluation Criteria

Relationships

Document Model

Network Deployment

Configuring Transports

Installing Bluetooth on Linux

Transports

Cloud-Optional Design

Mesh Network

Consistency Models

Sync and Replication Concepts

Platform Compatibility

Release Notes Directory

Authentication

Access Control Permissions

Certificate-Based Security

Security

Glossary

Platform Manual

Data Types

Supported Types Overview

Learning Resource: Interactive Tutorial

Update Behavior by Type