Best Offline-First Databases in Japan

Firebase helps you build and run successful apps. Backed by Google and loved by app development teams - from startups to global enterprises. Products and solutions you can rely on through your app's journey. Install pre-packaged, open-source bundles of code to automate common development tasks. Easily integrate Firebase with your team’s favorite tools. Use Firebase products together to solve complex challenges and optimize your app experience. Personalize your onboarding flow, grow user engagement, or add new functionality with Firebase. Firebase provides detailed documentation and cross-platform SDKs to help you build and ship apps on Android, iOS, the web, C++, and Unity. Learn how to create a Firebase project, register apps to it, and integrate the Firebase SDKs for your products and platform: iOS, Android and Web. Learn about Firebase projects, including concept overviews, deep-dives into topics like project permissions and project management tools, or preparing to launch your app.

Cloud Firestore is a fast, fully managed, serverless, cloud-native NoSQL document database that simplifies storing, syncing, and querying data for your mobile, web, and IoT apps at global scale. Its client libraries provide live synchronization and offline support, while its security features and integrations with Firebase and Google Cloud Platform (GCP) accelerate the building of truly serverless apps. Firestore offers a great developer experience with built-in live synchronization, offline support, and ACID transactions. These features are available across a robust set of client and server-side libraries. Firestore automatically scales up and down based on demand. It requires no maintenance and provides high availability of 99.99–99.999% achieved through strongly consistent data replication. No-ops database lets you pay only for what you use—no up-front expenditure or underutilized resources. Simplified architecture lets your apps talk directly to Firestore.

​IndexedDB is a low-level API for client-side storage of significant amounts of structured data, including files/blobs. This API uses indexes to enable high-performance searches of this data. While web storage is useful for storing smaller amounts of data, it is less useful for storing larger amounts of structured data. IndexedDB provides a solution. IndexedDB is a transactional database system, like an SQL-based Relational Database Management System (RDBMS). However, unlike SQL-based RDBMSes, which use fixed-column tables, IndexedDB is a JavaScript-based object-oriented database. IndexedDB lets you store and retrieve objects that are indexed with a key; any objects supported by the structured clone algorithm can be stored. You need to specify the database schema, open a connection to your database, and then retrieve and update data within a series of transactions. Like most web storage solutions, IndexedDB follows the same-origin policy.

Dexie.js is a minimalistic and bulletproof IndexedDB wrapper library designed to simplify client-side storage. At only ~29k minified and gzipped, it offers a concise API that addresses the complexities of native IndexedDB, such as ambivalent error handling, poor queries, lack of reactivity, and code complexity. Dexie.js provides a well-thought-through API design, robust error handling, extendability, change tracking awareness, and extended KeyRange support, including case-insensitive search, set matches, and OR operations. It embraces the IndexedDB specification and all its features, allowing developers to use existing IndexedDB data without the need for data migration. Dexie.js supports composable real-time queries, enabling components to mirror the database in real-time across various front-end frameworks like React, Svelte, Vue, and Angular. With Dexie Cloud, developers can build consistent, authenticated, and access-controlled local-first apps with just a few lines of extra code.

​Realm is a mobile-first, open source object database designed to run directly inside phones, tablets, and wearables. It provides a simple, object-oriented data model that eliminates the need for an ORM, allowing developers to define models as regular classes in languages like Swift, Java, Kotlin, C#, JavaScript, Dart, and C++. Realm's architecture ensures high performance and low memory usage by employing a zero-copy design, lazy loading, and multi-version concurrency control (MVCC) for thread-safe operations. It's live objects and collections automatically update across threads, enabling reactive programming patterns. Realm supports relationships between objects via links and backlinks, facilitating complex data structures. Developers can utilize tools like Realm Studio to inspect and manipulate local Realm databases and integrate Realm into various platforms, including React Native, Flutter, Xamarin, and Node.js.

Berkeley DB is a family of embedded key-value database libraries providing scalable high-performance data management services to applications. The Berkeley DB products use simple function-call APIs for data access and management. Berkeley DB enables the development of custom data management solutions, without the overhead traditionally associated with such custom projects. Berkeley DB provides a collection of well-proven building-block technologies that can be configured to address any application need from the hand-held device to the data center, from a local storage solution to a world-wide distributed one, from kilobytes to petabytes.

The superfast nosql database for mobile and iot with integrated data synchronization. High-performance Objectbox is 10x faster than any alternative, improving response rates and enabling real-time applications. Check out our benchmarks. From sensor to server and everything in between. We support linux, windows, mac/ios, android, raspbian, etc. Embedded or containerized. Sync data seamlessly. Objectbox’ out-of-the-box synchronization makes data available when needed where needed, so you can take your app live faster. Offline first Develop applications that work on- and offline, independently from a constant internet connection, providing an “always-on”-feeling. Save time & dev. resources. Accelerate time-to-market, save development and lifecycle costs, save precious developer time for tasks that bring value, and let objectbox deal with the risk. Objectbox reduces cloud costs up to 60% by persisting data locally (on the edge), and syncing necessary data quicker and more efficiently.

Unlike other NoSQL databases, Couchbase provides an enterprise-class, multicloud to edge database that offers the robust capabilities required for business-critical applications on a highly scalable and available platform. As a distributed cloud-native database, Couchbase runs in modern dynamic environments and on any cloud, either customer-managed or fully managed as-a-service. Couchbase is built on open standards, combining the best of NoSQL with the power and familiarity of SQL, to simplify the transition from mainframe and relational databases. Couchbase Server is a multipurpose, distributed database that fuses the strengths of relational databases such as SQL and ACID transactions with JSON’s versatility, with a foundation that is extremely fast and scalable. It’s used across industries for things like user profiles, dynamic product catalogs, GenAI apps, vector search, high-speed caching, and much more.