Ditto
Ditto is a peer-to-peer sync platform that uses CRDTs to synchronize data between devices with or without internet connectivity, enabling offline-first applications across mobile, IoT, and edge environments.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
JWT-based identity with permission scopes provides reasonable security for P2P sync. Device identity is cryptographically bound. End-to-end encryption is available for sync data in transit between peers. Admin API key must be protected carefully.
⚡ Reliability
Best When
You are building applications for environments with unreliable connectivity (field operations, vehicles, factories, retail stores) and need data to stay available and writable offline then sync automatically.
Avoid When
Your application is web-only with reliable internet access where a traditional database with WebSockets achieves the same result without the complexity of P2P sync and CRDT data modeling.
Use Cases
- • Sync agent state and task queues across multiple edge devices in a mesh network where internet connectivity is intermittent or unavailable
- • Build offline-first mobile applications where an agent can read and write local data that automatically merges with other devices when connectivity is restored
- • Coordinate distributed agent workflows across IoT devices on a factory floor or vehicle fleet by syncing shared data without a central server
- • Replicate configuration or model updates from a cloud agent to edge agents using Ditto's sync without requiring direct device-to-cloud connections at sync time
- • Implement conflict-free collaborative data structures where multiple agents write simultaneously and CRDT semantics guarantee eventual consistency without conflicts
Not For
- • Applications that require strong ACID transactions with strict consistency — CRDT-based eventual consistency means writes from different peers merge automatically, which may not suit financial data
- • Purely cloud-based workloads where all clients have reliable internet and a central database is simpler — Ditto's value is offline and P2P scenarios
- • Large blob or binary file synchronization at scale — Ditto is optimized for structured document data, not large file sync
Interface
Authentication
Ditto uses JWT-based authentication where the Big Peer (cloud) issues tokens that devices present to join a sync mesh. Tokens encode identity and permission scopes. An HTTP API key is used for admin operations. Auth is tightly integrated with the sync identity model.
Pricing
Pricing is primarily device-count and sync-volume based. Enterprise deployments (thousands of devices) are contract-based. Contact sales for high-volume IoT use cases.
Agent Metadata
Known Gotchas
- ⚠ CRDT merge semantics mean that deletes can be 'revived' if a peer that missed the delete syncs an older write — agents must understand tombstone behavior to avoid zombie data
- ⚠ Ditto's query language (DQL) supports a subset of document query patterns — agents using complex SQL-style queries must rewrite them for Ditto's document model
- ⚠ JWT token expiry causes sync disconnection — agents operating long-running sessions must refresh tokens before expiry to avoid sync interruption
- ⚠ Schema changes (adding/removing fields) are handled by CRDT merging but can result in heterogeneous document shapes across peers until all devices sync — agents must handle missing fields gracefully
- ⚠ Mesh sync topology depends on device proximity and transport availability (BLE, WiFi, LAN, cloud relay) — agents cannot assume a specific sync path and must be resilient to variable sync latency
Alternatives
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Scores are editorial opinions as of 2026-03-07.