diff --git a/README.md b/README.md
index 2eddc5e79..ac55840aa 100644
--- a/README.md
+++ b/README.md
@@ -40,11 +40,11 @@ To solve these (and many other) problems, some projects will organize their code
 To setup and use this melos mono repo locally for the purposes of contributing, clone it and run the following commands from the root of the repository:
 
 ```bash
-# Remove previous instances of melos:
-dart pub global deactivate melos
+# Install melos if it's not already installed:
+dart pub global activate melos
 
 # Activate 'melos' from path:
-dart pub global activate --source="path" . --executable="melos"
+melos activate
 
 # Confirm you now using a local development version:
 melos --help
diff --git a/docs/filters.mdx b/docs/filters.mdx
index e945d2dfd..b7bc95b91 100644
--- a/docs/filters.mdx
+++ b/docs/filters.mdx
@@ -52,6 +52,18 @@ Only include packages that have been changed since the specified `ref`, e.g. a c
 melos exec --since=<commit hash> -- flutter build ios
 ```
 
+## --diff
+
+Only include packages that are different between the current working tree and the specified `ref`, e.g. a commit sha or git tag, or between two different refs.
+
+```bash
+# Run `flutter build ios` on all packages that are different between current branch and the specified commit hash
+melos exec --diff=<commit hash> -- flutter build ios
+
+# Run `flutter build ios` on all packages that are different between remote `main` branch and HEAD
+melos exec --diff=origin/main...HEAD -- flutter build ios
+```
+
 ## --dir-exists
 
 Include only packages where a specific directory exists inside the package.
diff --git a/melos.yaml b/melos.yaml
index e5b4ebaa4..d05e7f1bf 100644
--- a/melos.yaml
+++ b/melos.yaml
@@ -42,4 +42,12 @@ scripts:
     run: melos exec flutter format . --set-exit-if-changed
     description: Run `flutter format` checks for all packages.
 
-  version: dart run scripts/generate_version.dart
\ No newline at end of file
+  version: dart run scripts/generate_version.dart
+
+  activate:
+    description: Activate the local version of melos for development.
+    run: dart pub global activate --source="path" . --executable="melos" --overwrite
+
+  activate:pub:
+    description: Activate the published version of melos.
+    run: dart pub global activate melos
diff --git a/packages/melos/lib/melos.dart b/packages/melos/lib/melos.dart
index 76edc2b1a..70042e664 100644
--- a/packages/melos/lib/melos.dart
+++ b/packages/melos/lib/melos.dart
@@ -12,7 +12,13 @@ export 'src/common/exception.dart' show CancelledException, MelosException;
 export 'src/common/validation.dart' show MelosConfigException;
 export 'src/global_options.dart' show GlobalOptions;
 export 'src/logging.dart' show MelosLogger, ToMelosLoggerExtension;
-export 'src/package.dart' show Package, PackageFilter, PackageMap, PackageType;
+export 'src/package.dart'
+    show
+        Package,
+        PackageFilter,
+        PackageMap,
+        PackageType,
+        InvalidPackageFilterException;
 export 'src/workspace.dart' show IdeWorkspace, MelosWorkspace;
 export 'src/workspace_configs.dart'
     show
diff --git a/packages/melos/lib/src/command_runner/base.dart b/packages/melos/lib/src/command_runner/base.dart
index f8c25e432..f799f7278 100644
--- a/packages/melos/lib/src/command_runner/base.dart
+++ b/packages/melos/lib/src/command_runner/base.dart
@@ -89,7 +89,15 @@ abstract class MelosCommand extends Command<void> {
       filterOptionSince,
       valueHelp: 'ref',
       help: 'Only include packages that have been changed since the specified '
-          '`ref`, e.g. a commit sha or git tag.',
+          '`ref`, e.g. a commit sha or git tag. Cannot be used with --diff.',
+    );
+
+    argParser.addOption(
+      filterOptionDiff,
+      valueHelp: 'ref',
+      help: 'Only include packages that are different between current working '
+          'tree and the specified `ref`, e.g. a commit sha or git tag, '
+          'or between two different refs. Cannot be used with --since.',
     );
 
     argParser.addMultiOption(
@@ -149,6 +157,7 @@ abstract class MelosCommand extends Command<void> {
 
     final since =
         sinceEnabled ? argResults![filterOptionSince] as String? : null;
+    final diff = argResults![filterOptionDiff] as String?;
     final scope = argResults![filterOptionScope] as List<String>? ?? [];
     final ignore = argResults![filterOptionIgnore] as List<String>? ?? [];
 
@@ -161,6 +170,7 @@ abstract class MelosCommand extends Command<void> {
           .toList()
         ..addAll(config.ignore),
       updatedSince: since,
+      diff: diff,
       includePrivatePackages: argResults![filterOptionPrivate] as bool?,
       published: argResults![filterOptionPublished] as bool?,
       nullSafe: argResults![filterOptionNullsafety] as bool?,
diff --git a/packages/melos/lib/src/common/git.dart b/packages/melos/lib/src/common/git.dart
index 801288950..fbe716b78 100644
--- a/packages/melos/lib/src/common/git.dart
+++ b/packages/melos/lib/src/common/git.dart
@@ -344,3 +344,27 @@ Future<bool> gitIsBehindUpstream({
 
   return isBehind;
 }
+
+Future<bool> gitHasDiffInPackage(
+  Package package, {
+  required String diff,
+  required MelosLogger logger,
+}) async {
+  logger.trace(
+    '[GIT] Getting $diff diff for package ${package.name}.',
+  );
+
+  final processResult = await gitExecuteCommand(
+    arguments: [
+      '--no-pager',
+      'diff',
+      '--name-status',
+      diff,
+      '--',
+      '.',
+    ],
+    workingDirectory: package.path,
+    logger: logger,
+  );
+  return (processResult.stdout as String).isNotEmpty;
+}
diff --git a/packages/melos/lib/src/common/utils.dart b/packages/melos/lib/src/common/utils.dart
index df9c87dc5..6a0c25a8c 100644
--- a/packages/melos/lib/src/common/utils.dart
+++ b/packages/melos/lib/src/common/utils.dart
@@ -42,6 +42,7 @@ const filterOptionIgnore = 'ignore';
 const filterOptionDirExists = 'dir-exists';
 const filterOptionFileExists = 'file-exists';
 const filterOptionSince = 'since';
+const filterOptionDiff = 'diff';
 const filterOptionNullsafety = 'nullsafety';
 const filterOptionNoPrivate = 'no-private';
 const filterOptionPrivate = 'private';
diff --git a/packages/melos/lib/src/package.dart b/packages/melos/lib/src/package.dart
index 2ee5ba327..2c558c7e0 100644
--- a/packages/melos/lib/src/package.dart
+++ b/packages/melos/lib/src/package.dart
@@ -27,6 +27,7 @@ import 'package:pub_semver/pub_semver.dart';
 import 'package:pubspec/pubspec.dart';
 
 import '../version.g.dart';
+import 'common/exception.dart';
 import 'common/git.dart';
 import 'common/glob.dart';
 import 'common/http.dart' as http;
@@ -129,6 +130,7 @@ class PackageFilter {
     List<String> dependsOn = const [],
     List<String> noDependsOn = const [],
     this.updatedSince,
+    this.diff,
     this.includePrivatePackages,
     this.published,
     this.nullSafe,
@@ -143,7 +145,9 @@ class PackageFilter {
         noDependsOn = [
           ...noDependsOn,
           if (flutter == false) 'flutter',
-        ];
+        ] {
+    _validate();
+  }
 
   /// A default constructor with **all** properties as requires, to ensure that
   /// copyWith functions properly copy all properties.
@@ -155,12 +159,15 @@ class PackageFilter {
     required this.dependsOn,
     required this.noDependsOn,
     required this.updatedSince,
+    required this.diff,
     required this.includePrivatePackages,
     required this.published,
     required this.nullSafe,
     required this.includeDependencies,
     required this.includeDependents,
-  });
+  }) {
+    _validate();
+  }
 
   /// Patterns for filtering packages by name.
   final List<Glob> scope;
@@ -183,6 +190,9 @@ class PackageFilter {
   /// Filter package based on whether they received changed since a specific git commit/tag ID.
   final String? updatedSince;
 
+  /// Filter package based on whether they are different between specific git commit/tag ID.
+  final String? diff;
+
   /// Include/Exclude packages with `publish_to: none`.
   final bool? includePrivatePackages;
 
@@ -202,6 +212,14 @@ class PackageFilter {
   /// This supersede other filters.
   final bool includeDependencies;
 
+  void _validate() {
+    if (updatedSince != null && diff != null) {
+      throw InvalidPackageFilterException(
+        'Cannot specify both updatedSince and diff.',
+      );
+    }
+  }
+
   Map<String, Object?> toJson() {
     return {
       if (scope.isNotEmpty)
@@ -213,6 +231,7 @@ class PackageFilter {
       if (dependsOn.isNotEmpty) filterOptionDependsOn: dependsOn,
       if (noDependsOn.isNotEmpty) filterOptionNoDependsOn: noDependsOn,
       if (updatedSince != null) filterOptionSince: updatedSince,
+      if (diff != null) filterOptionDiff: diff,
       if (includePrivatePackages != null)
         filterOptionPrivate: includePrivatePackages,
       if (published != null) filterOptionPublished: published,
@@ -234,6 +253,7 @@ class PackageFilter {
       published: published,
       scope: scope,
       updatedSince: since,
+      diff: diff,
       includeDependencies: includeDependencies,
       includeDependents: includeDependents,
     );
@@ -251,6 +271,7 @@ class PackageFilter {
       published: published,
       scope: scope,
       updatedSince: updatedSince,
+      diff: diff,
       includeDependencies: includeDependencies,
       includeDependents: includeDependents,
     );
@@ -271,7 +292,8 @@ class PackageFilter {
       const DeepCollectionEquality().equals(other.fileExists, fileExists) &&
       const DeepCollectionEquality().equals(other.dependsOn, dependsOn) &&
       const DeepCollectionEquality().equals(other.noDependsOn, noDependsOn) &&
-      other.updatedSince == updatedSince;
+      other.updatedSince == updatedSince &&
+      other.diff == diff;
 
   @override
   int get hashCode =>
@@ -287,7 +309,8 @@ class PackageFilter {
       const DeepCollectionEquality().hash(fileExists) ^
       const DeepCollectionEquality().hash(dependsOn) ^
       const DeepCollectionEquality().hash(noDependsOn) ^
-      updatedSince.hashCode;
+      updatedSince.hashCode ^
+      diff.hashCode;
 
   @override
   String toString() {
@@ -305,10 +328,20 @@ PackageFilter(
   dependsOn: $dependsOn,
   noDependsOn: $noDependsOn,
   updatedSince: $updatedSince,
+  diff: $diff,
 )''';
   }
 }
 
+class InvalidPackageFilterException extends MelosException {
+  InvalidPackageFilterException(this.message);
+
+  final String message;
+
+  @override
+  String toString() => 'Invalid package filters: $message';
+}
+
 // Not using MapView to prevent map mutation
 class PackageMap {
   PackageMap(Map<String, Package> packages, this._logger)
@@ -442,8 +475,17 @@ The packages that caused the problem are:
         .applyDependsOn(filter.dependsOn)
         .applyNoDependsOn(filter.noDependsOn)
         .filterNullSafe(nullSafe: filter.nullSafe)
-        .filterPublishedPackages(published: filter.published)
-        .then((packages) => packages.applySince(filter.updatedSince, _logger));
+        .filterPublishedPackages(published: filter.published);
+
+    final updatedSince = filter.updatedSince;
+    if (updatedSince != null) {
+      packageList = await packageList.applySince(updatedSince, _logger);
+    }
+
+    final diff = filter.diff;
+    if (diff != null) {
+      packageList = await packageList.applyDiff(diff, _logger);
+    }
 
     packageList = packageList.applyIncludeDependentsOrDependencies(
       includeDependents: filter.includeDependents,
@@ -559,6 +601,27 @@ extension on Iterable<Package> {
     return packagesFilteredWithGitCommitsSince;
   }
 
+  Future<Iterable<Package>> applyDiff(
+    String? diff,
+    MelosLogger logger,
+  ) async {
+    if (diff == null) return this;
+
+    final pool = Pool(10);
+    final packagesFilteredWithGitCommitsSince = <Package>[];
+
+    await pool.forEach<Package, void>(this, (package) {
+      return gitHasDiffInPackage(package, diff: diff, logger: logger)
+          .then((commits) async {
+        if (commits) {
+          packagesFilteredWithGitCommitsSince.add(package);
+        }
+      });
+    }).drain<void>();
+
+    return packagesFilteredWithGitCommitsSince;
+  }
+
   /// Whether to include/exclude packages that are null-safe.
   ///
   /// If `include` is true, only null-safe packages.
diff --git a/packages/melos/lib/src/scripts.dart b/packages/melos/lib/src/scripts.dart
index c8288136e..b07113f24 100644
--- a/packages/melos/lib/src/scripts.dart
+++ b/packages/melos/lib/src/scripts.dart
@@ -277,6 +277,12 @@ class Script {
       path: filtersPath,
     );
 
+    final diff = assertIsA<String?>(
+      value: yaml[filterOptionDiff],
+      key: filterOptionDiff,
+      path: filtersPath,
+    );
+
     final excludePrivatePackagesTmp = assertIsA<bool?>(
       value: yaml[filterOptionNoPrivate],
       key: filterOptionNoPrivate,
@@ -329,6 +335,7 @@ class Script {
       dependsOn: dependsOn,
       noDependsOn: noDependsOn,
       updatedSince: updatedSince,
+      diff: diff,
       includePrivatePackages: includePrivatePackages,
       published: published,
       nullSafe: nullSafe,