openutau · atouu · Jun 24, 2026 · Jun 24, 2026 · Jun 24, 2026 · Jun 24, 2026
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -6,21 +6,29 @@ on:
         default: "0.0.0"
         required: true
         type: string
+      channel:
+        description: 'Channel'
+        type: choice
+        required: true
+        default: 'beta'
+        options:
+          - 'stable'
+          - 'beta'
+          - 'nightly'
       release:
         type: boolean
         default: false
         description: "Release"
-      beta:
-        type: boolean
-        default: true
-        description: "Beta"
       draft:
         type: boolean
         default: true
         description: "Draft"
 
+run-name: Build ${{ inputs.version }}
+
 env:
-  release-name: ${{ inputs.version }}${{ inputs.beta && ' Beta' || '' }}
+  release-name: ${{ inputs.version }}${{ inputs.channel == 'beta' && ' Beta' || '' }}
+  release-tag: ${{ inputs.channel == 'nightly' && 'nightly' || inputs.version }}
 
 jobs:
   build:
@@ -51,7 +59,7 @@ jobs:
           node-version: 20
       - name: Install NSIS via Chocolatey
         run: choco install nsis --version=3.11 --no-progress
-        if: ${{ matrix.arch.os == 'win' }}
+        if: ${{ matrix.arch.os == 'win' &&  inputs.channel != 'nightly' }}
       - uses: justalemon/VersionPatcher@v0.7.1
         with:
           version: ${{ inputs.version }}
@@ -66,15 +74,15 @@ jobs:
         run: dotnet restore OpenUtau -r ${{ matrix.arch.rid }}
 
       - name: Build (Windows and Linux)
-        run: dotnet publish OpenUtau -c Release -r ${{ matrix.arch.rid }} --self-contained true -o bin/${{ matrix.arch.name }}/
+        run: dotnet publish OpenUtau -c Release -r ${{ matrix.arch.rid }} --self-contained true -o bin/${{ matrix.arch.name }}/ -p:Nightly=${{ inputs.channel == 'nightly' }}
         if: ${{ matrix.arch.os != 'osx' }}
 
       - name: Build (MacOS)
-        run: dotnet msbuild OpenUtau -t:BundleApp -p:Configuration=Release -p:RuntimeIdentifier=${{ matrix.arch.rid }} -p:UseAppHost=true -p:SelfContained=true -p:OutputPath=../bin/${{ matrix.arch.name }}/
+        run: dotnet msbuild OpenUtau -t:BundleApp -p:Configuration=Release -p:RuntimeIdentifier=${{ matrix.arch.rid }} -p:UseAppHost=true -p:SelfContained=true -p:OutputPath=../bin/${{ matrix.arch.name }}/ -p:Nightly=${{ inputs.channel == 'nightly' }}
         if: ${{ matrix.arch.os == 'osx' }}
 
       - name: Write release channel info
-        run: "@{Beta=$${{ inputs.beta }}} | ConvertTo-Json > bin/${{ matrix.arch.name }}/prefs-default.json"
+        run: "@{Beta=$${{ inputs.channel == 'beta' }}} | ConvertTo-Json > bin/${{ matrix.arch.name }}/prefs-default.json"
         shell: pwsh
 
       # Create Zip
@@ -114,7 +122,7 @@ jobs:
         with:
           script-file: OpenUtau.nsi
           arguments: "-DPRODUCT_VERSION=${{ inputs.version }} -DARCH=${{ matrix.arch.arch }}"
-        if: ${{ matrix.arch.os == 'win' }}
+        if: ${{ matrix.arch.os == 'win' &&  inputs.channel != 'nightly' }}
 
       # Create Dmg
       - name: Create Dmg
@@ -161,7 +169,7 @@ jobs:
         with:
           name: OpenUtau-${{ matrix.arch.name }}.exe
           path: OpenUtau-${{ matrix.arch.name }}.exe
-        if: ${{ !inputs.release && matrix.arch.os == 'win' }}
+        if: ${{ !inputs.release && matrix.arch.os == 'win' &&  inputs.channel != 'nightly' }}
 
       - uses: actions/upload-artifact@v4
         with:
@@ -177,38 +185,61 @@ jobs:
 
       # Appcast
       - name: Appcast Windows
-        shell: cmd
+        shell: bash
         run: |
-          python appcast.py -v=${{ inputs.version }} -o=windows -r=${{ matrix.arch.name }} -f=OpenUtau-${{ matrix.arch.name }}.zip
-          python appcast.py -v=${{ inputs.version }} -o=windows -r=${{ matrix.arch.name }}-installer -f=OpenUtau-${{ matrix.arch.name }}.exe
+          python appcast.py -v=${{ inputs.version }} -o=windows -r=${{ matrix.arch.name }} -t ${{ env.release-tag }} -f=OpenUtau-${{ matrix.arch.name }}.zip
+          if ${{ inputs.channel != 'nightly' }}; then
+            python appcast.py -v=${{ inputs.version }} -o=windows -r=${{ matrix.arch.name }}-installer -f=OpenUtau-${{ matrix.arch.name }}.exe
+          fi
         if: ${{ inputs.release && matrix.arch.os == 'win' }}
 
       - name: Appcast MacOS
         run: |
-          python appcast.py -v=${{ inputs.version }} -o=macos -r=${{ matrix.arch.name }} -f=OpenUtau-${{ matrix.arch.name }}.dmg
+          python appcast.py -v=${{ inputs.version }} -o=macos -r=${{ matrix.arch.name }} -t ${{ env.release-tag }} -f=OpenUtau-${{ matrix.arch.name }}.dmg
         if: ${{ inputs.release && matrix.arch.os == 'osx' }}
 
       - name: Appcast Linux
         run: |
-          python appcast.py -v=${{ inputs.version }} -o=linux -r=${{ matrix.arch.name }} -f=OpenUtau-${{ matrix.arch.name }}.tar.gz
+          python appcast.py -v=${{ inputs.version }} -o=linux -r=${{ matrix.arch.name }} -t ${{ env.release-tag }} -f=OpenUtau-${{ matrix.arch.name }}.tar.gz
         if: ${{ inputs.release && matrix.arch.os == 'linux' }}
 
       # Release
-      - name: Release
-        uses: softprops/action-gh-release@v2
+      - name: Regular Release
+        uses: ncipollo/release-action@v1
         with:
-          tag_name: ${{ inputs.version }}
+          tag: ${{ inputs.version }}
           name: ${{ env.release-name }}
-          prerelease: ${{ inputs.beta }}
+          prerelease: ${{ inputs.channel != 'stable' }}
+          allowUpdates: true
           draft: ${{ inputs.draft }}
-          files: |
-            appcast.${{ matrix.arch.name }}*.xml
-            OpenUtau-${{ matrix.arch.name }}.*
+          artifacts: "appcast.${{ matrix.arch.name }}*.xml,OpenUtau-${{ matrix.arch.name }}.*"
           body: |
             See [Getting Started](https://github.com/stakira/OpenUtau/wiki/Getting-Started) for how to use.
 
             If you encountered issues, see [FAQ](https://github.com/stakira/OpenUtau/wiki/FAQ)
 
             ## macOS says "This app is damaged"
             Open a terminal and run `xattr -rc /Applications/OpenUtau.app`. Try opening OpenUtau again.
-        if: ${{ inputs.release }}
+        if: ${{ inputs.release && inputs.channel != 'nightly' }}
+
+      - name: Nightly Release
+        uses: ncipollo/release-action@v1
+        with:
+          tag: nightly
+          name: Nightly
+          prerelease: true
+          allowUpdates: true
+          draft: ${{ inputs.draft }}
+          artifacts: "appcast.${{ matrix.arch.name }}*.xml,OpenUtau-${{ matrix.arch.name }}.*"
+          body: |
+            > [!WARNING]
+            > Nightly builds are for testing purposes only and must not use for production.
+            > If you encounter bugs, check the [FAQ](https://github.com/stakira/OpenUtau/wiki/FAQ) first, then open an issue if needed.
+
+            | Build Version         | Commit            |
+            | --------------------- | ----------------- |
+            | ${{ inputs.version }} | ${{ github.sha }} |
+
+            ## macOS says "This app is damaged"
+            Open a terminal and run `xattr -rc /Applications/OpenUtau.app`. Try opening OpenUtau again.
+        if: ${{ inputs.release && inputs.channel == 'nightly' }}
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
@@ -0,0 +1,42 @@
+name: Nightly
+
+on:
+  schedule:
+    - cron: '0 1 * * *'
+  workflow_dispatch:
+
+jobs:
+  trigger:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Check for changes
+        id: check_changes
+        run: |
+          # Only trigger nightly from these folders
+          REGEX="^(OpenUtau(.Plugin.Builtin|.Core|)|runtimes)"
+          echo "changes=$(git log --since="yesterday" --name-only --oneline --pretty=format:"" | grep -m1 -E "$REGEX")" >> $GITHUB_OUTPUT
+      - name: Get Version
+        id: get_version
+        if: ${{ steps.check_changes.outputs.changes != '' }}
+        env:
+          GH_TOKEN: ${{ github.token }}
+          REPO: openutau/OpenUtau # Please modify if you want to release your fork
+        run: |
+            latest=$(gh release list --repo $REPO --json tagName --json tagName --jq 'first(.[] | select(.tagName | test("^[0-9]+\\.[0-9]+\\.[0-9]+$"))).tagName')
+            nextver=$(npx -y semver -i patch ${latest})
+            echo fullver=${nextver}-nightly.`date +%Y%m%d` >> $GITHUB_OUTPUT
+      - name: Trigger Build
+        if: ${{ steps.check_changes.outputs.changes != '' }}
+        uses: benc-uk/workflow-dispatch@v1
+        with:
+          workflow: build.yml
+          inputs: '{ "channel": "nightly", "version": "${{ steps.get_version.outputs.fullver }}", "release": true, "draft": false }'
+      - name: Delete workflow runs
+        uses: Mattraks/delete-workflow-runs@v2
+        with:
+          retain_days: 5
+          keep_minimum_runs: 5
+          delete_workflow_pattern: nightly
diff --git a/OpenUtau/OpenUtau.csproj b/OpenUtau/OpenUtau.csproj
@@ -15,6 +15,9 @@
     <PublishReadyToRun>true</PublishReadyToRun>
     <DebugType>embedded</DebugType>
     <StartupObject />
+    <IncludeSourceRevisionInInformationalVersion>
+      false
+    </IncludeSourceRevisionInInformationalVersion>
   </PropertyGroup>
   <PropertyGroup>
     <CFBundleName>OpenUtau</CFBundleName>
@@ -126,4 +129,7 @@
       <LastGenOutput>Resources.Designer.cs</LastGenOutput>
     </EmbeddedResource>
   </ItemGroup>
+  <PropertyGroup>
+    <DefineConstants Condition="$(Nightly) == 'true'">$(DefineConstants);NIGHTLY</DefineConstants>
+  </PropertyGroup>
 </Project>
diff --git a/OpenUtau/Program.cs b/OpenUtau/Program.cs
@@ -34,7 +34,9 @@ public static void Main(string[] args) {
             Log.Information($"{RuntimeInformation.OSDescription} " +
                 $"{RuntimeInformation.OSArchitecture} " +
                 $"{RuntimeInformation.ProcessArchitecture}");
-            Log.Information($"OpenUtau v{Assembly.GetEntryAssembly()?.GetName().Version} " +
+            Log.Information($"OpenUtau v{Assembly.GetEntryAssembly()
+                ?.GetCustomAttribute<AssemblyInformationalVersionAttribute>()
+                ?.InformationalVersion} " +
                 $"{RuntimeInformation.RuntimeIdentifier}");
             Log.Information($"Data path = {PathManager.Inst.DataPath}");
             Log.Information($"Cache path = {PathManager.Inst.CachePath}");

diff --git a/OpenUtau/Strings/Strings.axaml b/OpenUtau/Strings/Strings.axaml
@@ -592,6 +592,7 @@ Warning: this option removes custom presets.</system:String>
   <system:String x:Key="prefs.editing">Editing</system:String>
   <system:String x:Key="prefs.general">General</system:String>
   <system:String x:Key="prefs.note.restart">Note: please restart OpenUtau after changing this item.</system:String>
+  <system:String x:Key="prefs.note.nightly">Note: Switching between channels is not supported in nightly builds.</system:String>
   <system:String x:Key="prefs.otoeditor">Oto Editor</system:String>
   <system:String x:Key="prefs.otoeditor.select">Default Oto Editor</system:String>
   <system:String x:Key="prefs.otoeditor.setparampath">setParam Path</system:String>

diff --git a/OpenUtau/ViewModels/MainWindowViewModel.cs b/OpenUtau/ViewModels/MainWindowViewModel.cs
@@ -4,6 +4,7 @@
 using System.Linq;
 using System.Reactive;
 using System.Threading.Tasks;
+using System.Reflection;
 using Avalonia.Threading;
 using DynamicData.Binding;
 using OpenUtau.App.Views;
@@ -72,7 +73,9 @@ public class MainWindowViewModel : ViewModelBase, ICmdSubscriber {
 
         [Reactive] public string ClearCacheHeader { get; set; }
         public bool ProjectSaved => !string.IsNullOrEmpty(DocManager.Inst.Project.FilePath) && DocManager.Inst.Project.Saved;
-        public string AppVersion => $"OpenUtau v{System.Reflection.Assembly.GetEntryAssembly()?.GetName().Version}";
+        public string AppVersion => $"OpenUtau v{Assembly.GetEntryAssembly()
+            ?.GetCustomAttribute<AssemblyInformationalVersionAttribute>()
+            ?.InformationalVersion}";
         [Reactive] public double Progress { get; set; }
         [Reactive] public string ProgressText { get; set; }
         [Reactive] public bool ShowPianoRoll { get; set; }

diff --git a/OpenUtau/ViewModels/PreferencesViewModel.cs b/OpenUtau/ViewModels/PreferencesViewModel.cs
@@ -128,6 +128,12 @@ public int SafeMaxThreadCount {
         [Reactive] public bool RememberVsqx { get; set; }
         public string WinePath => Preferences.Default.WinePath;
 
+        #if NIGHTLY
+        public bool IsNightly => true;
+        #else
+        public bool IsNightly => false;
+        #endif
+
         public PreferencesViewModel() {
             var audioOutput = PlaybackManager.Inst.AudioOutput;
             if (audioOutput != null) {

diff --git a/OpenUtau/ViewModels/UpdaterViewModel.cs b/OpenUtau/ViewModels/UpdaterViewModel.cs
@@ -4,6 +4,7 @@
 using System.Linq;
 using System.Net.Http;
 using System.Threading.Tasks;
+using System.Reflection;
 using Avalonia.Media;
 using NetSparkleUpdater;
 using NetSparkleUpdater.AppCastHandlers;
@@ -29,10 +30,13 @@ class GithubRelease {
             public bool draft;
             public bool prerelease;
             public string name = string.Empty;
+            public string tag_name = string.Empty;
             public GithubReleaseAsset[] assets = new GithubReleaseAsset[0];
 #pragma warning restore 0649
         }
-        public string AppVersion => $"v{System.Reflection.Assembly.GetEntryAssembly()?.GetName().Version}";
+        public string AppVersion => $"v{Assembly.GetEntryAssembly()
+            ?.GetCustomAttribute<AssemblyInformationalVersionAttribute>()
+            ?.InformationalVersion}";
         public bool IsDarkMode => ThemeManager.IsDarkMode;
         [Reactive] public string UpdaterStatus { get; set; }
         [Reactive] public bool UpdateAvailable { get; set; }
@@ -84,17 +88,28 @@ public UpdaterViewModel() {
             client.DefaultRequestHeaders.Add("Accept", "application/json");
             client.DefaultRequestHeaders.Add("User-Agent", "Other");
             client.Timeout = TimeSpan.FromSeconds(30);
-            using var resposne = await client.GetAsync("https://api.github.com/repos/stakira/OpenUtau/releases");
+
+            #if !NIGHTLY
+                using var resposne = await client.GetAsync("https://api.github.com/repos/openutau/OpenUtau/releases");
+            #else
+                using var resposne = await client.GetAsync("https://api.github.com/repos/openutau/OpenUtau/releases/tags/nightly");
+            #endif
+
             resposne.EnsureSuccessStatusCode();
             string respBody = await resposne.Content.ReadAsStringAsync();
-            List<GithubRelease>? releases = JsonConvert.DeserializeObject<List<GithubRelease>>(respBody);
-            if (releases == null) {
-                return null;
-            }
-            return releases
-                .Where(r => !r.draft && r.prerelease == Preferences.Default.Beta)
-                .OrderByDescending(r => r.id)
-                .FirstOrDefault();
+
+            #if !NIGHTLY
+                List<GithubRelease>? releases = JsonConvert.DeserializeObject<List<GithubRelease>>(respBody);
+                if (releases == null) {
+                    return null;
+                }
+                return releases
+                    .Where(r => !r.draft && r.tag_name != "nightly" && r.prerelease == Preferences.Default.Beta)
+                    .OrderByDescending(r => r.id)
+                    .FirstOrDefault();
+            #else
+                return JsonConvert.DeserializeObject<GithubRelease>(respBody);
+            #endif
         }
 
         static GithubReleaseAsset? SelectAppcast(GithubRelease release) {

diff --git a/OpenUtau/Views/PreferencesDialog.axaml b/OpenUtau/Views/PreferencesDialog.axaml
@@ -82,11 +82,12 @@
               </DataTemplate>
             </ComboBox.ItemTemplate>
           </ComboBox>
-          <Grid Margin="0,5,0,0">
+          <Grid Margin="0,5,0,0" IsVisible="{Binding !IsNightly}">
             <TextBlock Text="{DynamicResource prefs.advanced.beta}" HorizontalAlignment="Left"/>
             <ToggleSwitch IsChecked="{Binding Beta}"/>
           </Grid>
-          <TextBlock Classes="restart"/>
+          <TextBlock Classes="restart" IsVisible="{Binding !IsNightly}"/>
+          <TextBlock IsVisible="{Binding IsNightly}" Margin="0,10,0,0" Text="{DynamicResource prefs.note.nightly}"/>
         </StackPanel>
 
         <!-- Playback -->

diff --git a/appcast.py b/appcast.py
@@ -7,12 +7,14 @@ def main():
     parser.add_argument('-o', '--os', help='OS name', required=True)
     parser.add_argument('-r', '--rid', help='RID', required=True)
     parser.add_argument('-f', '--file', help='File name', required=True)
+    parser.add_argument('-t', '--tag', help='Tag (Version if unspecified)')
     args = parser.parse_args()
 
     appcast_ver = args.version
     appcast_os = args.os
     appcast_rid = args.rid
     appcast_file = args.file
+    appcast_tag = args.tag or args.version
 
     xml = '''<?xml version="1.0" encoding="utf-8"?>
 <rss version="2.0" xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle">
@@ -31,7 +33,7 @@ def main():
     </item>
 </channel>
 </rss>''' % (appcast_ver, datetime.now().strftime("%a, %d %b %Y %H:%M:%S %z"),
-             appcast_ver, appcast_file, appcast_ver, appcast_ver, appcast_os)
+             appcast_tag, appcast_file, appcast_ver, appcast_ver, appcast_os)
 
     with open("appcast.%s.xml" % (appcast_rid), 'w') as f:
         f.write(xml)