diff --git a/flake.nix b/flake.nix
index 4b0ead6e98..e5d3d03933 100644
--- a/flake.nix
+++ b/flake.nix
@@ -245,7 +245,7 @@
                 # we need threaded here, otherwise all the queing logic doesn't work properly.
                 # for iOS we also use -staticlib, to get one rolled up library.
                 # still needs mac2ios patching of the archives.
-                ghcOptions = [ "-staticlib" "-threaded" ];
+                ghcOptions = [ "-staticlib" "-threaded" "-DIOS" ];
                 postInstall = ''
                   ${pkgs.tree}/bin/tree $out
                   mkdir -p $out/_pkg
@@ -267,6 +267,33 @@
               };
             };
             "x86_64-darwin" = {
+              # this is the aarch64-darwin iOS build (to be patched with mac2ios)
+              "x86_64-darwin-ios:lib:simplex-chat" = (drv' { pkgs' = pkgs; extra-modules = [{ packages.simplexmq.flags.swift = true; }]; } ).simplex-chat.components.library.override {
+                smallAddressSpace = true; enableShared = false;
+                # we need threaded here, otherwise all the queing logic doesn't work properly.
+                # for iOS we also use -staticlib, to get one rolled up library.
+                # still needs mac2ios patching of the archives.
+                ghcOptions = [ "-staticlib" "-threaded" "-DIOS" ];
+                postInstall = ''
+                  ${pkgs.tree}/bin/tree $out
+                  mkdir -p $out/_pkg
+                  # copy over includes, we might want those, but maybe not.
+                  # cp -r $out/lib/*/*/include $out/_pkg/
+                  # find the libHS...ghc-X.Y.Z.a static library; this is the
+                  # rolled up one with all dependencies included.
+                  find ./dist -name "libHS*.a" -exec cp {} $out/_pkg \;
+                  find ${pkgs.libffi.overrideAttrs (old: { dontDisableStatic = true; })}/lib -name "*.a" -exec cp {} $out/_pkg \;
+                  find ${pkgs.gmp6.override { withStatic = true; }}/lib -name "*.a" -exec cp {} $out/_pkg \;
+                  # There is no static libc
+                  ${pkgs.tree}/bin/tree $out/_pkg
+                  (cd $out/_pkg; ${pkgs.zip}/bin/zip -r -9 $out/pkg-ios-x86_64-swift-json.zip *)
+                  rm -fR $out/_pkg
+                  mkdir -p $out/nix-support
+                  echo "file binary-dist \"$(echo $out/*.zip)\"" \
+                      > $out/nix-support/hydra-build-products
+                '';
+              };
+              # This is the aarch64-darwin build with tagged JSON format (for Mac & Flutter)
               "x86_64-darwin:lib:simplex-chat" = (drv pkgs).simplex-chat.components.library.override {
                 smallAddressSpace = true; enableShared = false;
                 # we need threaded here, otherwise all the queing logic doesn't work properly.
@@ -285,7 +312,7 @@
                   find ${pkgs.gmp6.override { withStatic = true; }}/lib -name "*.a" -exec cp {} $out/_pkg \;
                   # There is no static libc
                   ${pkgs.tree}/bin/tree $out/_pkg
-                  (cd $out/_pkg; ${pkgs.zip}/bin/zip -r -9 $out/pkg-ios-x86_64.zip *)
+                  (cd $out/_pkg; ${pkgs.zip}/bin/zip -r -9 $out/pkg-ios-x86_64-tagged-json.zip *)
                   rm -fR $out/_pkg
                   mkdir -p $out/nix-support
                   echo "file binary-dist \"$(echo $out/*.zip)\"" \