Realm: Create reactive mobile apps in a fraction of the time

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Realm Mobile Database

Fully open source. Totally free. Loved by 100k active developers. Client-side database.

Realm Mobile Platform

Build realtime collaboration, offline-first experiences and more. Client and server data platform.

Available for Free

Two‑way data sync, real‑time collaboration, offline‑first applications, API bridge, data push

World‑class apps have world-class features

The Realm Mobile Platform enables any development team, no matter the size, to include difficult-to-build features like two‑way data sync and realtime collaboration. Devote more time to what makes your app truly unique and less time to maintaining services.

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Realtime collaboration in as little as 10 lines of code

See the Realm Mobile Platform demo app in action and the developer experience

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Realm Mobile Platform

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

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// Authenticating the User
[RLMSyncUser logInWithCredentials:[RLMSyncCredentials credentialsWithGoogleToken:@"google token"]
                    authServerURL:[NSURL URLWithString:@"http://realm.example.com:9080"]
                     onCompletion:^(RLMSyncUser *user, NSError *error) {
  if (user) {
    // Opening a remote Realm
    NSURL *realmURL = [NSURL URLWithString:@"realm://realm.example.com:9080/~/userRealm"];
    RLMRealmConfiguration *config = [[RLMRealmConfiguration alloc] init];
    config.syncConfiguration = [[RLMSyncConfiguration alloc] initWithUser:user realmURL: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: "http://realm.example.com:9080")!)
{ user, error in
  if let user = user {
    // Opening a remote Realm
    let realmURL = URL(string: "realm://realm.example.com:9080/~/userRealm")!
    let config = Realm.Configuration(syncConfiguration: SyncConfiguration(user: user, realmURL: realmURL))
    let realm = try! Realm(configuration: config)
    // 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(Credentials.google("google token"),
                       "http://realm.example.co:9080/auth");
// Opening a remote Realm
String realmURL = "realm://realm.example.com:9080/~/userRealm";
SyncConfiguration configuration = new SyncConfiguration.Builder(user,
                                                                realmURL).build();
Realm realm = Realm.getInstance(syncConfiguration);
// Any changes made to this Realm will be synced across all devices!

// Authenticating the User
Realm.Sync.User.registerWithProvider('http://realm.example.co:9080', 'google', googleAccessToken, (error, user) => {
  if (!error) {
    // Opening a remote Realm
    var realm = new Realm({
      sync: {
        user: user,
        url: 'realm://realm.example.co:9080/~/userRealm',
      }
    });
    // Any changes made to this Realm will be synced across all devices!
  }
})

// Coming Soon

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;
@end
@implementation Dog
@end

Dog *dog = [Dog new];
dog.name = @"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 {
  dynamic var name = ""
  dynamic var age = 0
}

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

let realm = try! Realm()
try! realm.write {
  realm.add(dog)
}

let pups = realm.objects(Dog.self).filter("age < 2")

public class Dog extends RealmObject {
  public String name;
  public int age;
}

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

Realm realm = Realm.getDefaultInstance();
realm.beginTransaction();
realm.copyToRealm(dog)
realm.commitTransaction();

RealmResults<Dog> pups = realm.where(Dog.class)
                               .lessThan("age", 2)
                               .findAll();

public class Dog : RealmObject 
{
  public string Name { get; set; }
  public int Age { get; set; }
}

var realm = Realm.GetInstance();
realm.Write(() => 
{
  var mydog = realm.CreateObject<Dog>();
  mydog.Name = "Rex";
  mydog.Age = 1;
});

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

Realm Mobile Database

A better mobile database means better apps. Use the Realm Mobile 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.

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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;
@end
@implementation Dog
@end

Dog *dog = [Dog new];
dog.name = @"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 {
  dynamic var name = ""
  dynamic var age = 0
}

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

let realm = try! Realm()
try! realm.write {
  realm.add(dog)
}

let pups = realm.objects(Dog.self).filter("age < 2")

public class Dog extends RealmObject {
  public String name;
  public int age;
}

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

Realm realm = Realm.getDefaultInstance();
realm.beginTransaction();
realm.copyToRealm(dog)
realm.commitTransaction();

RealmResults<Dog> pups = realm.where(Dog.class)
                               .lessThan("age", 2)
                               .findAll();

public class Dog : RealmObject 
{
  public string Name { get; set; }
  public int Age { get; set; }
}

var realm = Realm.GetInstance();
realm.Write(() => 
{
  var mydog = realm.CreateObject<Dog>();
  mydog.Name = "Rex";
  mydog.Age = 1;
});

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

Over 1 billion users rely on Realm

Trusted by Fortune 500 mainstays, innovative startups, and #1‑ranked app store successes, Realm is built into apps used by hundreds of millions of people every day.

Developers love using Realm

Open source projects needn't look further than @realm for inspiration on a collaborative development process. https://t.co/WMDudzSJbW 👏👏
— Kaushik Gopal (@kaushikgopal) December 14, 2016

Very impressive! I’m a huge fan of innovative solutions—especially critical processes like data persistence. 💯 https://t.co/lEPxDPyqtP
— Kevin Hoctor (@kevinhoctor) May 25, 2016

@realm is THE thing for mobile app development now. #android #ios #backend
— ¯\_(ツ)_/¯ (@coletzLp) September 27, 2016

I boosted my database of 200,000 rows search from 7 seconds to 0.5 seconds with @realm . Practically under 30 mins of using it 1st time.
— Vijaya P. Kandel (@kandelvijaya) September 11, 2015

I continue to be a massive fan of @realm. If you’re not using this… go home, you’re drunk.
— David McGraw 🎮 (@xmcgraw) March 12, 2016

Me using @realm for the first time: “this CAN’T be that easy. Pretty sure I’m missing something.”
— Marco Sero (@marcosero) April 29, 2015

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Our community pages help you discover what's new and important in your language. By recording talks at the top developer conferences and running local meetups and events, we're helping you spread knowledge of what works to make even better apps.

See why over 100,000 developers choose Realm

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