diff --git a/src/abstractions/index.ts b/src/abstractions/index.ts
index 1bd679e41c..d74fbfe8a9 100644
--- a/src/abstractions/index.ts
+++ b/src/abstractions/index.ts
@@ -11,6 +11,7 @@ export { PasswordGenerationService } from './passwordGeneration.service';
 export { PlatformUtilsService } from './platformUtils.service';
 export { SettingsService } from './settings.service';
 export { StorageService } from './storage.service';
+export { SyncService } from './sync.service';
 export { TokenService } from './token.service';
 export { TotpService } from './totp.service';
 export { UserService } from './user.service';
diff --git a/src/abstractions/sync.service.ts b/src/abstractions/sync.service.ts
new file mode 100644
index 0000000000..553124a27a
--- /dev/null
+++ b/src/abstractions/sync.service.ts
@@ -0,0 +1,9 @@
+export interface SyncService {
+    syncInProgress: boolean;
+
+    getLastSync();
+    setLastSync(date: Date);
+    syncStarted();
+    syncCompleted(successfully: boolean);
+    fullSync(forceSync: boolean);
+}
diff --git a/src/services/index.ts b/src/services/index.ts
index a01df662ae..0e6ab04f75 100644
--- a/src/services/index.ts
+++ b/src/services/index.ts
@@ -10,6 +10,7 @@ export { FolderService } from './folder.service';
 export { LockService } from './lock.service';
 export { PasswordGenerationService } from './passwordGeneration.service';
 export { SettingsService } from './settings.service';
+export { SyncService } from './sync.service';
 export { TokenService } from './token.service';
 export { TotpService } from './totp.service';
 export { UserService } from './user.service';
diff --git a/src/services/sync.service.ts b/src/services/sync.service.ts
new file mode 100644
index 0000000000..550974c4ba
--- /dev/null
+++ b/src/services/sync.service.ts
@@ -0,0 +1,181 @@
+import { ApiService } from '../abstractions/api.service';
+import { CipherService } from '../abstractions/cipher.service';
+import { CollectionService } from '../abstractions/collection.service';
+import { CryptoService } from '../abstractions/crypto.service';
+import { FolderService } from '../abstractions/folder.service';
+import { MessagingService } from '../abstractions/messaging.service';
+import { SettingsService } from '../abstractions/settings.service';
+import { StorageService } from '../abstractions/storage.service';
+import { SyncService as SyncServiceInterface } from '../abstractions/sync.service';
+import { UserService } from '../abstractions/user.service';
+
+import { CipherData } from '../models/data/cipherData';
+import { CollectionData } from '../models/data/collectionData';
+import { FolderData } from '../models/data/folderData';
+
+import { CipherResponse } from '../models/response/cipherResponse';
+import { CollectionResponse } from '../models/response/collectionResponse';
+import { DomainsResponse } from '../models/response/domainsResponse';
+import { FolderResponse } from '../models/response/folderResponse';
+import { ProfileResponse } from '../models/response/profileResponse';
+
+const Keys = {
+    lastSyncPrefix: 'lastSync_',
+};
+
+export class SyncService implements SyncServiceInterface {
+    syncInProgress: boolean = false;
+
+    constructor(private userService: UserService, private apiService: ApiService,
+        private settingsService: SettingsService, private folderService: FolderService,
+        private cipherService: CipherService, private cryptoService: CryptoService,
+        private collectionService: CollectionService, private storageService: StorageService,
+        private messagingService: MessagingService, private logoutCallback: Function) {
+    }
+
+    async getLastSync() {
+        const userId = await this.userService.getUserId();
+        const lastSync = await this.storageService.get<any>(Keys.lastSyncPrefix + userId);
+        if (lastSync) {
+            return new Date(lastSync);
+        }
+
+        return null;
+    }
+
+    async setLastSync(date: Date) {
+        const userId = await this.userService.getUserId();
+        await this.storageService.save(Keys.lastSyncPrefix + userId, date.toJSON());
+    }
+
+    syncStarted() {
+        this.syncInProgress = true;
+        this.messagingService.send('syncStarted');
+    }
+
+    syncCompleted(successfully: boolean) {
+        this.syncInProgress = false;
+        this.messagingService.send('syncCompleted', { successfully: successfully });
+    }
+
+    async fullSync(forceSync: boolean) {
+        this.syncStarted();
+        const isAuthenticated = await this.userService.isAuthenticated();
+        if (!isAuthenticated) {
+            this.syncCompleted(false);
+            return false;
+        }
+
+        const now = new Date();
+        const needsSyncResult = await this.needsSyncing(forceSync);
+        const needsSync = needsSyncResult[0];
+        const skipped = needsSyncResult[1];
+
+        if (skipped) {
+            this.syncCompleted(false);
+            return false;
+        }
+
+        if (!needsSync) {
+            await this.setLastSync(now);
+            this.syncCompleted(false);
+            return false;
+        }
+
+        const userId = await this.userService.getUserId();
+        try {
+            const response = await this.apiService.getSync();
+
+            await this.syncProfile(response.profile);
+            await this.syncFolders(userId, response.folders);
+            await this.syncCollections(response.collections);
+            await this.syncCiphers(userId, response.ciphers);
+            await this.syncSettings(userId, response.domains);
+
+            await this.setLastSync(now);
+            this.syncCompleted(true);
+            return true;
+        } catch (e) {
+            this.syncCompleted(false);
+            return false;
+        }
+    }
+
+    // Helpers
+
+    private async needsSyncing(forceSync: boolean) {
+        if (forceSync) {
+            return [true, false];
+        }
+
+        try {
+            const response = await this.apiService.getAccountRevisionDate();
+            const accountRevisionDate = new Date(response);
+            const lastSync = await this.getLastSync();
+            if (lastSync != null && accountRevisionDate <= lastSync) {
+                return [false, false];
+            }
+
+            return [true, false];
+        } catch (e) {
+            return [false, true];
+        }
+    }
+
+    private async syncProfile(response: ProfileResponse) {
+        const stamp = await this.userService.getSecurityStamp();
+        if (stamp != null && stamp !== response.securityStamp) {
+            if (this.logoutCallback != null) {
+                this.logoutCallback(true);
+            }
+
+            throw new Error('Stamp has changed');
+        }
+
+        await this.cryptoService.setEncKey(response.key);
+        await this.cryptoService.setEncPrivateKey(response.privateKey);
+        await this.cryptoService.setOrgKeys(response.organizations);
+        await this.userService.setSecurityStamp(response.securityStamp);
+    }
+
+    private async syncFolders(userId: string, response: FolderResponse[]) {
+        const folders: { [id: string]: FolderData; } = {};
+        response.forEach((f) => {
+            folders[f.id] = new FolderData(f, userId);
+        });
+        return await this.folderService.replace(folders);
+    }
+
+    private async syncCollections(response: CollectionResponse[]) {
+        const collections: { [id: string]: CollectionData; } = {};
+        response.forEach((c) => {
+            collections[c.id] = new CollectionData(c);
+        });
+        return await this.collectionService.replace(collections);
+    }
+
+    private async syncCiphers(userId: string, response: CipherResponse[]) {
+        const ciphers: { [id: string]: CipherData; } = {};
+        response.forEach((c) => {
+            ciphers[c.id] = new CipherData(c, userId);
+        });
+        return await this.cipherService.replace(ciphers);
+    }
+
+    private async syncSettings(userId: string, response: DomainsResponse) {
+        let eqDomains: string[][] = [];
+        if (response != null && response.equivalentDomains != null) {
+            eqDomains = eqDomains.concat(response.equivalentDomains);
+        }
+
+        if (response != null && response.globalEquivalentDomains != null) {
+            response.globalEquivalentDomains.forEach((global) => {
+                if (global.domains.length > 0) {
+                    eqDomains.push(global.domains);
+                }
+            });
+        }
+
+        return this.settingsService.setEquivalentDomains(eqDomains);
+    }
+}