Isar review
A free, typed local database for Flutter apps that need advanced offline queries.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Isar is an open-source, embedded NoSQL database for Flutter applications. It is designed for local persistence in apps targeting web, iOS, Android, desktop, and other Flutter environments, including applications that need to operate with intermittent connectivity. Flutter developers get asynchronous database operations, collection CRUD, typed queries, links, embedded objects, and multi-isolate support in a local database focused on application-side data access.
The free open-source model keeps the database accessible without a paid tier structure. Its strongest technical fit is for Flutter projects that need more than basic local storage: indexed and filtered queries, composite and multi-entry indexes, full-text search, ACID transactions with rollback, and static typing with compile-time query checking are all part of the feature set. These capabilities make Isar suitable for structured offline data and query-heavy mobile workflows, while its web, iOS, and Android support broadens the deployment options for Dart and Flutter teams.
The main qualification is production versioning. The published guidance states that Isar v4 is not ready for production and recommends stable version 3 for production use, so teams need to account for that distinction when planning adoption. Verified synchronization and integrations are also limited, making Isar a weaker choice for products that depend on managed sync or a wide external-service ecosystem. Choose it for Flutter applications centered on typed local data, offline operation, and efficient queries; consider another database when synchronization and integrations are primary requirements.
Isar pros and cons
- Where it wins
- Asynchronous CRUD with indexed, filtered, and full-text queries
- ACID transactions with rollback and compile-time query checking
- Open-source local persistence across web, iOS, and Android
- Where it doesn't
- Isar v4 is not ready for production; stable version 3 is recommended
- Verified synchronization capabilities are limited
- Integration options are limited compared with broader database ecosystems
Isar fact sheet, pricing and score →
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