diff --git a/.gitignore b/.gitignore
index b70c56b7..2f48b149 100644
--- a/.gitignore
+++ b/.gitignore
@@ -43,6 +43,7 @@ scripts/docker/*.err
 
 # nix build output link
 result
+result-*
 
 # IDEA config
 .idea/
diff --git a/contrib/package/nix/copyparty/default.nix b/contrib/package/nix/copyparty/default.nix
index 22ae5bcd..702431d6 100644
--- a/contrib/package/nix/copyparty/default.nix
+++ b/contrib/package/nix/copyparty/default.nix
@@ -67,18 +67,64 @@
   # additional dependencies
   extraPythonPackages ? (_p: [ ]),
 
+  # to build stable + unstable with the same file
+  stable ? true,
+
+  # for commit date, only used when stable = false
+  copypartyFlake ? null,
+
+  nix-gitignore,
 }:
 
 let
   pinData = lib.importJSON ./pin.json;
   runtimeDeps = ([ util-linux ] ++ extraPackages ++ lib.optional withMediaProcessing ffmpeg);
+  inherit (copypartyFlake) lastModifiedDate;
+  # ex: "1970" "01" "01"
+  dateStringsZeroPrefixed = {
+    year = builtins.substring 0 4 lastModifiedDate;
+    month = builtins.substring 4 2 lastModifiedDate;
+    day = builtins.substring 6 2 lastModifiedDate;
+  };
+  # ex: "1970" "1" "1"
+  dateStringsShort = builtins.mapAttrs (_: val: toString (lib.toIntBase10 val)) dateStringsZeroPrefixed;
+  unstableVersion =
+    if copypartyFlake == null then
+      "${pinData.version}-unstable"
+    else
+      with dateStringsZeroPrefixed; "${pinData.version}-unstable-${year}-${month}-${day}"
+  ;
+  version = if stable then pinData.version else unstableVersion;
+  stableSrc = fetchurl {
+    inherit (pinData) url hash;
+  };
+  root = ../../../..;
+  unstableSrc = nix-gitignore.gitignoreSource [] root;
+  src = if stable then stableSrc else unstableSrc;
+  rev = copypartyFlake.shortRev or copypartyFlake.dirtyShortRev or "unknown";
+  unstableCodename = "unstable" + (lib.optionalString (copypartyFlake != null) "-${rev}");
 in
 buildPythonApplication {
   pname = "copyparty";
-  inherit (pinData) version;
-  src = fetchurl {
-    inherit (pinData) url hash;
-  };
+  inherit version src;
+  postPatch = lib.optionalString (!stable) ''
+    old_src="$(mktemp -d)"
+    tar -C "$old_src" -xf ${stableSrc}
+    declare -a folders
+    folders=("$old_src"/*)
+    count_folders="''${#folders[@]}"
+    if [[ $count_folders != 1 ]]; then
+      declare -p folders
+      echo "Expected 1 folder, found $count_folders" >&2
+      exit 1
+    fi
+    old_src_folder="''${folders[0]}"
+    cp -r "$old_src_folder"/copyparty/web/deps copyparty/web/deps
+    sed -i 's/^CODENAME =.*$/CODENAME = "${unstableCodename}"/' copyparty/__version__.py
+    ${lib.optionalString (copypartyFlake != null) (with dateStringsShort; ''
+      sed -i 's/^BUILD_DT =.*$/BUILD_DT = (${year}, ${month}, ${day})/' copyparty/__version__.py
+    '')}
+  '';
   dependencies =
     [
       jinja2
diff --git a/contrib/package/nix/overlay.nix b/contrib/package/nix/overlay.nix
index ca8d5c6e..7b951c5b 100644
--- a/contrib/package/nix/overlay.nix
+++ b/contrib/package/nix/overlay.nix
@@ -1,8 +1,28 @@
-final: prev: {
-  copyparty = final.python3.pkgs.callPackage ./copyparty {
-    ffmpeg = final.ffmpeg-full;
+final: prev:
+let
+  fullAttrs = {
+    withHashedPasswords = true;
+    withCertgen = true;
+    withThumbnails = true;
+    withFastThumbnails = true;
+    withMediaProcessing = true;
+    withBasicAudioMetadata = true;
+    withZeroMQ = true;
+    withFTP = true;
+    withFTPS = true;
+    withTFTP = true;
+    withSMB = true;
+    withMagic = true;
   };
 
+  call = attrs: final.python3.pkgs.callPackage ./copyparty ({ ffmpeg = final.ffmpeg-full; } // attrs);
+in
+{
+  copyparty = call { stable = true; };
+  copyparty-unstable = call { stable = false; };
+  copyparty-full = call (fullAttrs // { stable = true; });
+  copyparty-unstable-full = call (fullAttrs // { stable = false; });
+
   python3 = prev.python3.override {
     packageOverrides = pyFinal: pyPrev: {
       partftpy = pyFinal.callPackage ./partftpy { };
diff --git a/flake.nix b/flake.nix
index 336642ee..d797ca9c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -12,7 +12,8 @@
     }:
     {
       nixosModules.default = ./contrib/nixos/modules/copyparty.nix;
-      overlays.default = import ./contrib/package/nix/overlay.nix;
+      overlays.default = final: prev:
+        (import ./contrib/package/nix/overlay.nix final prev) // { copypartyFlake = self; };
     }
     // flake-utils.lib.eachDefaultSystem (
       system:
@@ -22,26 +23,26 @@
           config = {
             allowAliases = false;
           };
-          overlays = [ self.overlays.default ];
+          overlays = [
+            self.overlays.default
+          ];
         };
       in
       {
         # check that copyparty builds with all optionals turned on
-        checks.copyparty-full = self.packages.${system}.copyparty.override {
-          withHashedPasswords = true;
-          withCertgen = true;
-          withThumbnails = true;
-          withFastThumbnails = true;
-          withMediaProcessing = true;
-          withBasicAudioMetadata = true;
-          withZeroMQ = true;
-          withFTPS = true;
-          withSMB = true;
+        checks = {
+          inherit (pkgs)
+            copyparty-full
+            copyparty-unstable-full
+            ;
         };
 
         packages = {
           inherit (pkgs)
             copyparty
+            copyparty-full
+            copyparty-unstable
+            copyparty-unstable-full
             ;
           default = self.packages.${system}.copyparty;
         };