Need help with isar?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

189 Stars 10 Forks Apache License 2.0 167 Commits 6 Opened issues


Super Fast Cross Platform Database for Flutter & Web Apps

Services available


Need anything else?

Contributors list

Isar Database

🚧 Very unstable and not ready for serious usage 🚧

QuickstartDocumentationExamplesSupport &

Isar [ee-zahr]:

  1. River in Bavaria, Germany.
  2. Database that will make your life easier.


  • ⚡️ Launch your app instantly no matter how much data you have
  • 📈 Highly scalable from hundreds to tens of thousands of records
  • 😎 Lazy loaded. Only load data when you need it
  • 🔎 Full text search. Make searching fast and fun
  • 📱 Multiplatform. iOS, Android, Desktop and the web (soon™)
  • 💙 Made for Flutter. Easily use it in your Flutter app
  • 🧪 ACID semantics. Rely on consistency
  • Asynchronous. Parallel query operations & multi-isolate support
  • ⚠️ Static typing with compile time checked and autocompleted queries

Add to pubspec.yaml

  isar: any
  isar_flutter: any # contains the binaries

dev_dependencies: isar_generator: any build_runnder: any

Schema definition

class Post with IsarObject {

@ObjectId() // implicit unique index String uuid;

@Index(stringType: StringIndexType.words, caseSensitive: false) // Search index String title;

List comments }

CRUD operations

All basic crud operations are available via the IsarCollection.

final newPost = Post() = uuid()
  ..title = 'Amazing new database'
  ..comments = ['First'];

await isar.writeTxn((isar) { await isar.posts.put(newPost); // insert });

final existingPost = await isar.get(; // get

await isar.writeTxn((isar) { await isar.posts.delete(; // delete });


Isar has a powerful query language that allows you to make use of your indexes, filter distinct objects, use complex

groups and sort the results.
final isar = await openIsar();

final databasePosts = isar.posts .where() .titleWordBeginsWith('dAtAb') // use search index .limit(10) .findAll()

final postsWithFirstCommentOrTitle = isar.posts .where() .sortedById() // use implicit ObjectId index .filter() .commentsAnyEqualTo('first', caseSensitive: false) .or() .titleEqualTo('first') .findAll();


With Isar you can watch Collections, Objects or Queries. A watcher is notified after a transactions commits succesfully and the target actually changes. Watchers can be lazy and not reload the data or they can be non-lazy and fetch the new results in background.

Stream collectionStream = true);

Stream> queryStream = false);

queryStream.listen((newResult) { // do UI updates })


Copyright 2021 Simon Leier

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.