diff --git a/src/Core/Abstractions/ISettingsService.cs b/src/Core/Abstractions/ISettingsService.cs
new file mode 100644
index 000000000..a5b780e8d
--- /dev/null
+++ b/src/Core/Abstractions/ISettingsService.cs
@@ -0,0 +1,13 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Bit.Core.Abstractions
+{
+    public interface ISettingsService
+    {
+        Task ClearAsync(string userId);
+        void ClearCache();
+        Task<List<List<string>>> GetEquivalentDomainsAsync();
+        Task SetEquivalentDomainsAsync(List<List<string>> equivalentDomains);
+    }
+}
\ No newline at end of file
diff --git a/src/Core/Services/SettingsService.cs b/src/Core/Services/SettingsService.cs
new file mode 100644
index 000000000..7f607c86f
--- /dev/null
+++ b/src/Core/Services/SettingsService.cs
@@ -0,0 +1,90 @@
+using Bit.Core.Abstractions;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Bit.Core.Services
+{
+    public class SettingsService : ISettingsService
+    {
+        private const string Keys_SettingsFormat = "settings_{0}";
+        private const string Keys_EquivalentDomains = "equivalentDomains";
+
+        private readonly IUserService _userService;
+        private readonly IStorageService _storageService;
+
+        private Dictionary<string, object> _settingsCache;
+
+        public SettingsService(
+            IUserService userService,
+            IStorageService storageService)
+        {
+            _userService = userService;
+            _storageService = storageService;
+        }
+
+        public void ClearCache()
+        {
+            _settingsCache.Clear();
+            _settingsCache = null;
+        }
+
+        public Task<List<List<string>>> GetEquivalentDomainsAsync()
+        {
+            return GetSettingsKeyAsync<List<List<string>>>(Keys_EquivalentDomains);
+        }
+
+        public Task SetEquivalentDomainsAsync(List<List<string>> equivalentDomains)
+        {
+            return SetSettingsKeyAsync(Keys_EquivalentDomains, equivalentDomains);
+        }
+
+        public async Task ClearAsync(string userId)
+        {
+            await _storageService.RemoveAsync(string.Format(Keys_SettingsFormat, userId));
+            ClearCache();
+        }
+
+        // Helpers
+
+        private async Task<Dictionary<string, object>> GetSettingsAsync()
+        {
+            if(_settingsCache == null)
+            {
+                var userId = await _userService.GetUserIdAsync();
+                _settingsCache = await _storageService.GetAsync<Dictionary<string, object>>(
+                    string.Format(Keys_SettingsFormat, userId));
+            }
+            return _settingsCache;
+        }
+
+        private async Task<T> GetSettingsKeyAsync<T>(string key)
+        {
+            var settings = await GetSettingsAsync();
+            if(settings != null && settings.ContainsKey(key))
+            {
+                return (T)settings[key];
+            }
+            return (T)(object)null;
+        }
+
+        private async Task SetSettingsKeyAsync<T>(string key, T value)
+        {
+            var userId = await _userService.GetUserIdAsync();
+            var settings = await GetSettingsAsync();
+            if(settings == null)
+            {
+                settings = new Dictionary<string, object>();
+            }
+            if(settings.ContainsKey(key))
+            {
+                settings[key] = value;
+            }
+            else
+            {
+                settings.Add(key, value);
+            }
+            await _storageService.SaveAsync(string.Format(Keys_SettingsFormat, userId), settings);
+            _settingsCache = settings;
+        }
+    }
+}