syncarpy

Syncarpy is an open-source software project that provides a framework for synchronizing data across devices, applications, and cloud services. It is designed for offline-first workflows and distributed systems where data consistency, resilience to network interruptions, and pluggable backends are important.

The architecture centers on a core synchronization engine that can operate with multiple data models. It supports both conflict-free replicated data types (CRDTs) for automatic conflict resolution and operational transforms for edit-based synchronization. The system uses a modular plugin architecture: data adapters translate between external data formats and the engine, transport adapters manage networking, and storage backends persist data locally or remotely.

Key features include real-time or near-real-time syncing, offline operation with local queues, multi-device synchronization, pluggable encryption options and TLS transport, and optional end-to-end encryption. It provides event hooks for applications to react to changes and supports transactional updates to ensure consistency.

The protocol aims for efficiency in bandwidth and latency, supports various transports (WebSocket, HTTP/2/GRPC), and negotiates capabilities between peers. Data models are defined in a schema language, and adapters handle serialization, validation, and conflict resolution strategies.

Syncarpy was released as an open-source project with permissive licensing and is maintained by a community of contributors. It integrates with popular ecosystems through adapters for databases, file storage, and messaging platforms. The project is suitable for collaborative apps, note services, and distributed mobile apps that require robust synchronization.

See also: CRDT, OT, offline-first design, data synchronization.