diff --git a/Wollmilchsau/Components/Pages/Admin/AdminHome.razor b/Wollmilchsau/Components/Pages/Admin/AdminHome.razor
index ffe6d78..5f95d6c 100644
--- a/Wollmilchsau/Components/Pages/Admin/AdminHome.razor
+++ b/Wollmilchsau/Components/Pages/Admin/AdminHome.razor
@@ -6,62 +6,95 @@
 @inject Fluxor.IState<Wollmilchsau.Store.AdminStore.AdminState> AdminState
 @inject IJSRuntime JsRuntime
 
-<PageTitle>LDAP Users</PageTitle>
+<PageTitle>User Comparison</PageTitle>
 
-<button class="btn btn-primary" @onclick="DownloadCsvAsync" disabled="@(!Users.Any())">Export CSV</button>
+<button class="btn btn-primary" @onclick="DownloadCsvAsync" disabled="@(!LdapUsers.Any())">Export CSV</button>
 
-<h1>LDAP Users</h1>
+<h1>User Comparison</h1>
 
-@if (!AdminState.Value.LdapUsersLoaded)
+@if (!AdminState.Value.LdapUsersLoaded || !AdminState.Value.MoodleUsersLoaded)
 {
     <p><em>Loading users...</em></p>
 }
-else if (!Users.Any())
-{
-    <p>No LDAP users found.</p>
-}
 else
 {
-    <table class="table">
-        <thead>
-            <tr>
-                <th>Username</th>
-                <th>Surname</th>
-                <th>Classroom</th>
-                <th>Given name</th>
-                <th>Incomplete</th>
-                <th>Role</th>
-            </tr>
-        </thead>
-        <tbody>
-            @foreach (var user in Users)
-            {
-                <tr>
-                    <td>@user.Username</td>
-                    <td>@user.Surname</td>
-                    <td>@user.Classroom</td>
-                    <td>@user.GivenName</td>
-                    <td>@user.Incomplete</td>
-                    <td>@user.Role</td>
-                </tr>
-            }
-        </tbody>
-    </table>
+    @if (AdminState.Value.MoodleUsersLoadFailed)
+    {
+        <MudAlert Severity="Severity.Error" Variant="Variant.Outlined">
+            Moodle users could not be loaded. LDAP users are shown without Moodle matches.
+        </MudAlert>
+    }
+
+    @if (!CombinedUsers.Any())
+    {
+        <p>No users found.</p>
+    }
+    else
+    {
+        <MudTable T="CombinedUser" Items="@CombinedUsers" Hover="true" Dense="true" RowsPerPage="25">
+            <HeaderContent>
+                <MudTh>Username</MudTh>
+                <MudTh>Classroom</MudTh>
+                <MudTh>Surname</MudTh>
+                <MudTh>Given name</MudTh>
+                <MudTh>Role</MudTh>
+                <MudTh>Exists in LDAP</MudTh>
+                <MudTh>Exists in Moodle</MudTh>
+            </HeaderContent>
+            <RowTemplate>
+                <MudTd DataLabel="Username">@context.Username</MudTd>
+                <MudTd DataLabel="Classroom">@context.Classroom</MudTd>
+                <MudTd DataLabel="Surname">@context.Surname</MudTd>
+                <MudTd DataLabel="Given name">@context.GivenName</MudTd>
+                <MudTd DataLabel="Role">@context.Role</MudTd>
+                <MudTd DataLabel="Exists in LDAP">@(context.ExistsInLdap ? "Yes" : "No")</MudTd>
+                <MudTd DataLabel="Exists in Moodle">@(context.ExistsInMoodle ? "Yes" : "No")</MudTd>
+            </RowTemplate>
+            <PagerContent>
+                <MudTablePager />
+            </PagerContent>
+        </MudTable>
+    }
 }
 
 @code {
-    private IEnumerable<Wollmilchsau.Models.LdapUser> Users => AdminState.Value.LdapUsers.Values;
+    private IEnumerable<Wollmilchsau.Models.LdapUser> LdapUsers => AdminState.Value.LdapUsers.Values;
+
+    private IEnumerable<CombinedUser> CombinedUsers
+    {
+        get
+        {
+            var ldapUsers = AdminState.Value.LdapUsers;
+            var moodleUsers = AdminState.Value.MoodleUsers.Values.ToArray();
+            var moodleUsersByUsername = moodleUsers
+                .Where(moodleUser => !string.IsNullOrWhiteSpace(moodleUser.Username))
+                .GroupBy(moodleUser => moodleUser.Username!, StringComparer.OrdinalIgnoreCase)
+                .ToDictionary(group => group.Key, group => group.First(), StringComparer.OrdinalIgnoreCase);
+
+            return ldapUsers.Values
+                .Select(ldapUser => CreateCombinedUser(
+                    ldapUser,
+                    moodleUsersByUsername.GetValueOrDefault(ldapUser.Username)))
+                .Concat(moodleUsers
+                    .Where(moodleUser =>
+                        string.IsNullOrWhiteSpace(moodleUser.Username) ||
+                        !ldapUsers.ContainsKey(moodleUser.Username))
+                    .Select(moodleUser => CreateCombinedUser(null, moodleUser)))
+                .OrderBy(user => user.Username, StringComparer.OrdinalIgnoreCase);
+        }
+    }
 
     protected override void OnInitialized()
     {
         base.OnInitialized();
+        Dispatcher.Dispatch(new Wollmilchsau.Store.AdminStore.GetAllMoodleUsers());
         Dispatcher.Dispatch(new Wollmilchsau.Store.AdminStore.GetAllLdapUsers());
         Dispatcher.Dispatch(new Wollmilchsau.Store.AdminStore.GetAllClassrooms());
     }
 
     private Task DownloadCsvAsync()
     {
-        var csv = string.Join("\r\n", Users
+        var csv = string.Join("\r\n", LdapUsers
             .Where(user => user.Role == Wollmilchsau.Models.LdapUserRole.Student)
             .Select(user => string.Join(';',
                 user.GivenName ?? string.Empty,
@@ -71,4 +104,27 @@ else
 
         return JsRuntime.InvokeVoidAsync("downloadTextFile", "ldap-users.csv", csv).AsTask();
     }
-}
\ No newline at end of file
+
+    private static CombinedUser CreateCombinedUser(
+        Wollmilchsau.Models.LdapUser? ldapUser,
+        Wollmilchsau.Models.MoodleUser? moodleUser)
+    {
+        return new CombinedUser(
+            ldapUser?.Username ?? moodleUser?.Username ?? string.Empty,
+            ldapUser?.Classroom,
+            ldapUser?.Surname ?? moodleUser?.Lastname,
+            ldapUser?.GivenName ?? moodleUser?.Firstname,
+            ldapUser?.Role,
+            ldapUser is not null,
+            moodleUser is not null);
+    }
+
+    private sealed record CombinedUser(
+        string Username,
+        string? Classroom,
+        string? Surname,
+        string? GivenName,
+        Wollmilchsau.Models.LdapUserRole? Role,
+        bool ExistsInLdap,
+        bool ExistsInMoodle);
+}
diff --git a/Wollmilchsau/Models/MoodleUser.cs b/Wollmilchsau/Models/MoodleUser.cs
index 8c44414..fec10d4 100644
--- a/Wollmilchsau/Models/MoodleUser.cs
+++ b/Wollmilchsau/Models/MoodleUser.cs
@@ -2,4 +2,25 @@
 
 public sealed record MoodleUser
 {
+    public int Id { get; init; }
+    public string? Username { get; init; }
+    public string? Firstname { get; init; }
+    public string? Lastname { get; init; }
+    public string? Fullname { get; init; }
+    public string? Initials { get; init; }
+    public string? Department { get; init; }
+    public long Firstaccess { get; init; }
+    public long Lastaccess { get; init; }
+    public string? Auth { get; init; }
+    public bool Suspended { get; init; }
+    public bool Confirmed { get; init; }
+    public string? Lang { get; init; }
+    public string? Theme { get; init; }
+    public string? Timezone { get; init; }
+    public int Mailformat { get; init; }
+    public int Trackforums { get; init; }
+    public string? Description { get; init; }
+    public int Descriptionformat { get; init; }
+    public string? Profileimageurlsmall { get; init; }
+    public string? Profileimageurl { get; init; }
 }
diff --git a/Wollmilchsau/Program.cs b/Wollmilchsau/Program.cs
index 00d8a0f..0b58d7d 100644
--- a/Wollmilchsau/Program.cs
+++ b/Wollmilchsau/Program.cs
@@ -12,6 +12,7 @@ using System.Text.Json;
 using Wollmilchsau.Components;
 using Wollmilchsau.Exceptions;
 using Wollmilchsau.Services.Ldap;
+using Wollmilchsau.Services.Moodle;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -90,6 +91,17 @@ builder.Services.AddOptions<LdapOptions>()
     .ValidateOnStart();
 builder.Services.AddScoped<ILdapService, LdapService>();
 
+builder.Services.AddOptions<MoodleOptions>()
+    .BindConfiguration("Moodle")
+    .ValidateDataAnnotations()
+    .ValidateOnStart();
+builder.Services.AddHttpClient<IMoodleService, MoodleService>((serviceProvider, client) =>
+{
+    var options = serviceProvider.GetRequiredService<Microsoft.Extensions.Options.IOptions<MoodleOptions>>().Value;
+    client.BaseAddress = new Uri(options.BaseUrl, UriKind.Absolute);
+    client.Timeout = TimeSpan.FromSeconds(30);
+});
+
 // Add services to the container.
 builder.Services.AddRazorComponents()
     .AddInteractiveServerComponents();
diff --git a/Wollmilchsau/Services/Moodle/IMoodleService.cs b/Wollmilchsau/Services/Moodle/IMoodleService.cs
new file mode 100644
index 0000000..792fb19
--- /dev/null
+++ b/Wollmilchsau/Services/Moodle/IMoodleService.cs
@@ -0,0 +1,8 @@
+using Wollmilchsau.Models;
+
+namespace Wollmilchsau.Services.Moodle;
+
+public interface IMoodleService
+{
+    Task<IReadOnlyCollection<MoodleUser>> GetAllUsers(CancellationToken cancellationToken = default);
+}
diff --git a/Wollmilchsau/Services/Moodle/MoodleOptions.cs b/Wollmilchsau/Services/Moodle/MoodleOptions.cs
new file mode 100644
index 0000000..020a1d9
--- /dev/null
+++ b/Wollmilchsau/Services/Moodle/MoodleOptions.cs
@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Wollmilchsau.Services.Moodle;
+
+public sealed class MoodleOptions
+{
+    [Required]
+    [Url]
+    public string BaseUrl { get; init; } = string.Empty;
+
+    [Required]
+    public string WsToken { get; init; } = string.Empty;
+}
diff --git a/Wollmilchsau/Services/Moodle/MoodleService.cs b/Wollmilchsau/Services/Moodle/MoodleService.cs
new file mode 100644
index 0000000..3af5a12
--- /dev/null
+++ b/Wollmilchsau/Services/Moodle/MoodleService.cs
@@ -0,0 +1,47 @@
+using System.Net.Http.Json;
+using Microsoft.AspNetCore.WebUtilities;
+using Microsoft.Extensions.Options;
+using Wollmilchsau.Models;
+
+namespace Wollmilchsau.Services.Moodle;
+
+public sealed class MoodleService(HttpClient httpClient, IOptions<MoodleOptions> options) : IMoodleService
+{
+    private readonly MoodleOptions _options = options.Value;
+
+    public async Task<IReadOnlyCollection<MoodleUser>> GetAllUsers(CancellationToken cancellationToken = default)
+    {
+        var requestUri = QueryHelpers.AddQueryString(
+            string.Empty,
+            new Dictionary<string, string?>
+            {
+                ["wstoken"] = _options.WsToken,
+                ["wsfunction"] = "core_user_get_users",
+                ["moodlewsrestformat"] = "json",
+                ["criteria[0][key]"] = "lastname",
+                ["criteria[0][value]"] = "%"
+            });
+
+        using var response = await httpClient.GetAsync(requestUri, cancellationToken);
+        response.EnsureSuccessStatusCode();
+
+        var result = await response.Content.ReadFromJsonAsync<MoodleUserSearchResponse>(cancellationToken);
+        if (result is null)
+        {
+            throw new InvalidOperationException("Moodle returned an empty user search response.");
+        }
+
+        if (!string.IsNullOrWhiteSpace(result.Exception))
+        {
+            throw new InvalidOperationException($"Moodle user search failed with {result.ErrorCode ?? "an unspecified error"}: {result.Message ?? result.Exception}.");
+        }
+
+        return result.Users ?? throw new InvalidOperationException("Moodle user search response did not contain users.");
+    }
+
+    private sealed record MoodleUserSearchResponse(
+        IReadOnlyCollection<MoodleUser>? Users,
+        string? Exception,
+        string? ErrorCode,
+        string? Message);
+}
diff --git a/Wollmilchsau/Store/AdminStore/AdminActions.cs b/Wollmilchsau/Store/AdminStore/AdminActions.cs
index f2a709b..2ce5bd9 100644
--- a/Wollmilchsau/Store/AdminStore/AdminActions.cs
+++ b/Wollmilchsau/Store/AdminStore/AdminActions.cs
@@ -3,6 +3,8 @@
 namespace Wollmilchsau.Store.AdminStore;
 
 public sealed record GetAllMoodleUsers();
+public sealed record SetMoodleUsers(IReadOnlyCollection<MoodleUser> Users);
+public sealed record SetMoodleUsersLoadFailed();
 public sealed record GetAllElementUsers();
 public sealed record GetAllLdapUsers();
 public sealed record SetLdapUsers(IReadOnlyCollection<LdapUser> Users);
diff --git a/Wollmilchsau/Store/AdminStore/AdminEffects.cs b/Wollmilchsau/Store/AdminStore/AdminEffects.cs
index 2036cf1..d9cadea 100644
--- a/Wollmilchsau/Store/AdminStore/AdminEffects.cs
+++ b/Wollmilchsau/Store/AdminStore/AdminEffects.cs
@@ -3,14 +3,77 @@ using Fluxor;
 using Microsoft.Extensions.Caching.Distributed;
 using Wollmilchsau.Models;
 using Wollmilchsau.Services.Ldap;
+using Wollmilchsau.Services.Moodle;
 
 namespace Wollmilchsau.Store.AdminStore;
 
-public sealed class AdminEffects(ILdapService ldapService, IDistributedCache cache)
+public sealed class AdminEffects(IMoodleService moodleService, ILdapService ldapService, IDistributedCache cache)
 {
+    private const string MoodleUsersCacheKey = "admin:moodle-users";
     private const string LdapUsersCacheKey = "admin:ldap-users";
     private const string ClassroomsCacheKey = "admin:classrooms";
 
+    [EffectMethod]
+    public async Task HandleGetAllMoodleUsers(GetAllMoodleUsers action, IDispatcher dispatcher)
+    {
+        try
+        {
+            var cachedUsers = await cache.GetStringAsync(MoodleUsersCacheKey);
+            IReadOnlyCollection<MoodleUser> users;
+
+            if (cachedUsers is not null)
+            {
+                var deserializedUsers = JsonSerializer.Deserialize<MoodleUser[]>(cachedUsers);
+                if (deserializedUsers is not null)
+                {
+                    users = deserializedUsers;
+                }
+                else
+                {
+                    await cache.RemoveAsync(MoodleUsersCacheKey);
+                    users = await LoadAndCacheMoodleUsers();
+                }
+            }
+            else
+            {
+                users = await LoadAndCacheMoodleUsers();
+            }
+
+            dispatcher.Dispatch(new SetMoodleUsers(users));
+        }
+        catch (HttpRequestException)
+        {
+            dispatcher.Dispatch(new SetMoodleUsersLoadFailed());
+        }
+        catch (JsonException)
+        {
+            dispatcher.Dispatch(new SetMoodleUsersLoadFailed());
+        }
+        catch (InvalidOperationException)
+        {
+            dispatcher.Dispatch(new SetMoodleUsersLoadFailed());
+        }
+        catch (TaskCanceledException)
+        {
+            dispatcher.Dispatch(new SetMoodleUsersLoadFailed());
+        }
+    }
+
+    private async Task<IReadOnlyCollection<MoodleUser>> LoadAndCacheMoodleUsers()
+    {
+        var users = await moodleService.GetAllUsers();
+
+        await cache.SetStringAsync(
+            MoodleUsersCacheKey,
+            JsonSerializer.Serialize(users),
+            new DistributedCacheEntryOptions
+            {
+                SlidingExpiration = TimeSpan.FromMinutes(10)
+            });
+
+        return users;
+    }
+
     [EffectMethod]
     public async Task HandleGetAllLdapUsers(GetAllLdapUsers action, IDispatcher dispatcher)
     {
diff --git a/Wollmilchsau/Store/AdminStore/AdminReducers.cs b/Wollmilchsau/Store/AdminStore/AdminReducers.cs
index 19b00c4..bac44a0 100644
--- a/Wollmilchsau/Store/AdminStore/AdminReducers.cs
+++ b/Wollmilchsau/Store/AdminStore/AdminReducers.cs
@@ -5,6 +5,28 @@ namespace Wollmilchsau.Store.AdminStore;
 
 public static class AdminReducers
 {
+    [ReducerMethod]
+    public static AdminState ReduceSetMoodleUsers(AdminState state, SetMoodleUsers action)
+    {
+        return state with
+        {
+            MoodleUsers = action.Users.ToImmutableDictionary(user => user.Id),
+            MoodleUsersLoaded = true,
+            MoodleUsersLoadFailed = false
+        };
+    }
+
+    [ReducerMethod]
+    public static AdminState ReduceSetMoodleUsersLoadFailed(AdminState state, SetMoodleUsersLoadFailed action)
+    {
+        return state with
+        {
+            MoodleUsers = [],
+            MoodleUsersLoaded = true,
+            MoodleUsersLoadFailed = true
+        };
+    }
+
     [ReducerMethod]
     public static AdminState ReduceSetLdapUsers(AdminState state, SetLdapUsers action)
     {
diff --git a/Wollmilchsau/Store/AdminStore/AdminState.cs b/Wollmilchsau/Store/AdminStore/AdminState.cs
index e613447..38ece97 100644
--- a/Wollmilchsau/Store/AdminStore/AdminState.cs
+++ b/Wollmilchsau/Store/AdminStore/AdminState.cs
@@ -9,7 +9,9 @@ public sealed record AdminState
 {
     public AdminState() { }
     public ImmutableDictionary<Guid, ElementUser> ElementUsers { get; init; } = [];
-    public ImmutableDictionary<Guid, MoodleUser> MoodleUsers { get; init; } = [];
+    public ImmutableDictionary<int, MoodleUser> MoodleUsers { get; init; } = [];
+    public bool MoodleUsersLoaded { get; init; }
+    public bool MoodleUsersLoadFailed { get; init; }
     public ImmutableDictionary<string, LdapUser> LdapUsers { get; init; } = [];
     public ImmutableList<Classroom> Classrooms { get; init; } = [];
     public bool LdapUsersLoaded { get; init; }