Ditto

Ditto is a distributed database and Edge SDK for teams building applications that must share data across phones, computers, and edge equipment even when connectivity is intermittent. It suits developers who need peer-to-peer replication rather than a permanently reachable central service. Its strongest case is resilient, bidirectional synchronization across disconnected devices; projects built around ordinary always-online backends will find that architecture unnecessary.

Overview

Ditto embeds a database inside each application, allowing devices to read and write locally while they are offline. Devices then exchange changes directly through an automatically formed wireless mesh instead of sending every operation to a central server. That design keeps an application usable during outages and in locations where internet access is limited or unavailable.

Synchronization can use Bluetooth Low Energy, peer-to-peer Wi-Fi, or a local area network, with no additional networking hardware. The approach is aimed at mobile and edge deployments where bandwidth and connectivity vary. For a wider comparison of this category, see Mobile Databases.

Key features

Offline operation and mesh replication

The embedded store supports both reads and writes without an internet connection, while bidirectional synchronization moves updates between peers when links appear. Devices running the Edge SDK create a mesh automatically, enabling real-time sharing in bandwidth-constrained environments. This is a meaningful advantage for field, retail, industrial, or transport applications that cannot pause whenever a connection drops. It is less compelling for a conventional app whose users are nearly always online and already served well by a centralized database.

Automatic conflict handling

Ditto resolves conflicts automatically when peers make changes independently, including changes made online and offline. It can also reconcile peer and cloud data when cloud connectivity returns. That removes a difficult synchronization layer from the application team, although teams with domain-specific merge rules should still verify that automatic resolution matches their business logic.

Platforms, languages, and integrations

The Edge SDK is platform agnostic across iOS, Android, Windows, and Linux. Supported languages and frameworks include Swift, Kotlin, JavaScript, C#, C++, Rust, Flutter, and React Native, giving mixed-platform teams several implementation paths. Pro and Enterprise plans list a MongoDB Connector. Ditto Server also provides HTTP webhook events and an HTTP document API, while Enterprise adds a Kafka change stream.

Security controls

Data is encrypted in transit with TLS 1.2 or later and encrypted at rest. Role-based controls and least-privilege access support a tighter operational model. Ditto also describes a data protection officer, annual employee training, and an incident-response process, useful requirements for organizations with formal compliance responsibilities.

Pricing

Ditto uses a freemium model with Ditto-hosted deployment on Free and Pro, and Ditto-hosted, bring-your-own-cloud (BYOC), or self-managed deployment on Enterprise.

Free is suitable for prototypes and small deployments that fit within its connection, storage, and transfer caps and can operate without an SLA. Pro is the practical step for a production service needing substantially higher quotas, a contractual 99% availability target, and business-hours assistance. Enterprise is for organizations requiring custom scale, around-the-clock support, a stronger SLA, or control over hosting; its price is negotiated rather than published.

Platforms

Ditto supports Android, iOS, Linux, macOS, and Windows. The Edge SDK's listed language and framework options are Swift, Kotlin, JavaScript, C#, C++, Rust, Flutter, and React Native, so teams can cover native and cross-platform applications without changing the replication model.

Who it's for

Choose Ditto for mobile or edge software that must remain useful during network loss, share state directly among nearby devices, or synchronize eventually across a fleet. Its mesh and conflict handling are particularly relevant when adding always-on infrastructure is impractical. A simple online CRUD application, or a project that needs only a local database with no peer replication, is unlikely to justify Ditto's distributed approach.

Pros and cons

• Pro: Offline reads and writes keep applications operational through internet outages.
• Pro: Bluetooth, peer-to-peer Wi-Fi, and LAN synchronization avoid dependence on extra network hardware.
• Pro: Automatic conflict resolution reduces custom reconciliation code for disconnected workflows.
• Pro: iOS, Android, Windows, and Linux coverage plus broad SDK language support suits heterogeneous fleets.
• Con: The Free plan is capped at 10 cloud connections, 2GB of storage, and 5GB of transfer, with no SLA and limited support.
• Con: Pro and Enterprise pricing is custom, making budgeting harder before contacting Ditto.
• Con: Automatic merges may not fit applications that require bespoke, domain-specific conflict policies.

Alternatives

Espresso is a free Android UI-testing tool for a single target app, so pick it for testing rather than distributed data storage. Hive is a free mobile database with a forever-free plan that includes 1,000 AI credits per month, 200MB storage, and up to 10 workspace members; it fits lightweight workspace use better than Ditto's peer mesh. RxDB offers a free core with replication and realtime sync across many platforms, making it an alternative for teams seeking an open-source-oriented reactive database. ObjectBox provides a no-cost core database, with Sync as a separate offering, for projects prioritizing local storage first. Realm is an open-source free mobile database, now associated with MongoDB's Atlas Device SDKs, and suits teams choosing that ecosystem. Sparksee has a free academic licence for eligible university users. SQLDelight is a free open-source Kotlin SQL code-generation library rather than a peer-to-peer mesh database. WCDB is a free open-source mobile database framework for teams that need local database infrastructure without Ditto's replication model.

Verdict

Pick Ditto when an application must keep reading, writing, and sharing data across disconnected mobile or edge devices. Its combination of embedded offline storage, wireless mesh synchronization, and automatic conflict handling is the central reason to choose it. Look elsewhere when you only need a local database or a straightforward always-online backend, or when custom conflict semantics and predictable published pricing matter more than resilient peer replication.