MongoDB Realm Has Arrived

MongoDB Realm helps you build modern mobile apps, faster. Use the Realm Mobile Database alongside Realm Sync (beta) to keep app data up-to-date in real time across multiple users, devices, and the MongoDB backend. Stop worrying about network availability and focus on building offline-first apps, with the innovative features your users will love.

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Realm helps companies build engaging mobile applications with minimal development time. Learn why every day hundreds of thousands of developers choose Realm.

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Realm 플랫폼은 작은 개발조직에서 커다란 개발팀까지 누구나 양방향 동기화나 실시간 협업과 같은 복잡한 기능을 쉽게 구현할 수 있게 해줍니다. 서비스를 관리하는 시간을 줄이고 더 멋진 앱을 만드는 데 집중하세요.

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Realm Database

Use the Realm Database to save data in minutes so you can build mobile apps in a fraction of the time. Our object database is a simple alternative to SQLite and Core Data and proudly open source. Available for Java, Swift, Objective‑C, JavaScript, and Xamarin.

더 알아보기
class Dog {}

Dog.schema = {
  name: 'Dog',
  properties: {
    name: 'string',
    age: 'int',

let realm = new Realm();
realm.write(() => {
  realm.create('Dog', {name: 'Rex', age: 1});

let pups = realm.objects('Dog').filtered('age < 2');
@interface Dog : RLMObject
@property NSString *name;
@property NSInteger age;
@implementation Dog

Dog *dog = [Dog new]; = @"Rex";
dog.age = 1;

RLMRealm *realm = [RLMRealm defaultRealm];
[realm transactionWithBlock:^{
  [realm addObject:dog];

RLMResults<Dog *> *allDogs = [Dog allObjects];
RLMResults<Dog *> *pups = [allDogs objectsWhere:@"age < 2"];
class Dog: Object {
  @objc dynamic var name = ""
  @objc dynamic var age = 0

let dog = Dog() = "Rex"
dog.age = 1

let realm = try! Realm()
try! realm.write {

let pups = realm.objects(Dog.self).filter("age < 2")
public class Dog extends RealmObject {
  public String name;
  public int age;

Dog dog = new Dog(); = "Rex";
dog.age = 1;

Realm realm = Realm.getDefaultInstance();

RealmResults<Dog> pups = realm.where(Dog.class)
                               .lessThan("age", 2)
public class Dog : RealmObject 
  public string Name { get; set; }
  public int Age { get; set; }

var realm = Realm.GetInstance();
realm.Write(() => 
  realm.Add(new Dog
    Name = "Rex",
    Age = 1

var pups = realm.All<Dog>().Where(d => d.Age < 2);

Realm Platform

Deploy data sync for your mobile apps use Realm Database and create reactive app experiences in as little as 10 lines of code. Realm Object Server and Realm Database combine to make the Realm Platform.

Try Realm Cloud
더 알아보기
// Authenticating the User
[RLMSyncUser logInWithCredentials:[RLMSyncCredentials credentialsWithGoogleToken:@"google token"]
                    authServerURL:[NSURL URLWithString:@""]
                     onCompletion:^(RLMSyncUser *user, NSError *error) {
  if (user) {
    // Opening a remote Realm
    NSURL *realmURL = [NSURL URLWithString:@"realm://"];
    RLMRealmConfiguration *config = [[RLMRealmConfiguration alloc] init];
    config.syncConfiguration = [user configurationWithURL: realmURL];
    RLMRealm *realm = [RLMRealm realmWithConfiguration:config error:nil];
    // Any changes made to this Realm will be synced across all devices!
  } else if (error) {
    // handle error
// Authenticating the User
SyncUser.logIn(with: .google(token: "google token"),
               server: URL(string: "")!)
{ user, error in
  if let user = user {
    // Opening a remote Realm
    let realm = try! Realm(configuration: user.configuration())
    // Any changes made to this Realm will be synced across all devices!
  } else if let error = error {
    // handle error
// Authenticating the User
User user = User.login("google token"),
// Opening a remote Realm
String realmURL = "realm://";
Realm realm = Realm.getInstance(user.getDefaultConfiguration());
// Any changes made to this Realm will be synced across all devices!
// Authenticating the User
Realm.Sync.User.registerWithProvider('', 'google', googleAccessToken, (error, user) => {
  if (!error) {
    // Opening a remote Realm
    var realm = new Realm({
      sync: {
        user: user,
        url: 'realm://',
    // Any changes made to this Realm will be synced across all devices!
var user = await User.LoginAsync(Credentials.Google("google token"),
                                 new Uri(""));

var realmUrl = new Uri("realm://");
var realm = Realm.GetInstance(user.configuration());
// Any changes made to this Realm will be synced across all devices!

Read a Whitepaper

Learn about Realm's best practices, approach to identity, access control, auditing and logging and encryption. Check out some of our whitepapers below.

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Try a Demo

Learn how to get a synchronized Realm up and running with just 20 lines of code, and discover the power of server-side event handling in a simple demo.

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Watch a Webinar

Get a clear and practical overview of the Realm Platform and its top use cases in these presentations and demos.

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Realm 플랫폼으로 특수 교육팀이 여러 기기에서 실시간으로 데이터를 동기화하고 협력 케어를 조율할 수 있도록 돕습니다. 더 알아보기

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Arccos는 전 세계의 골퍼를 대상으로 온라인 및 오프라인 환경에서 반응적이고 빠른 앱 경험을 제공합니다. 더 알아보기

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10줄 이하의 코드로 실시간 협업 기능 구현하기

모바일 플랫폼 데모 앱의 실제 구현 방법과 개발자의 경험 공유

영상 보기

Amazon, Google, Hipmunk, Starbucks 등 Realm 고객사의 로고

수십억 명이 사용하는 디바이스에 이미 Realm이 동작하고 있습니다

포춘 500 기업, 글로벌 2000 리더들, 그리고 앱스토어 1위 앱들이 믿고 사용하는 Realm은 수억명이 매일 사용하는 앱에서 사용되고 있습니다.

Read more from our Customers

수십만 명의 개발자들이 Realm을 선택한 이유를 확인해 보세요

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