diff --git a/experimenter/experimenter/experiments/constants.py b/experimenter/experimenter/experiments/constants.py
index f601607f2..02f18a2e5 100644
--- a/experimenter/experimenter/experiments/constants.py
+++ b/experimenter/experimenter/experiments/constants.py
@@ -915,7 +915,8 @@ class FirefoxLabsGroups(models.TextChoices):
     DAILY_ACTIVE_USERS = "client_level_daily_active_users_v2"
     DAYS_OF_USE = "days_of_use"
     RETENTION = "retained"
-    RETENTION_3_DAYS = "active_in_last_3_days_legacy"
+    RETENTION_3_DAYS = "active_in_last_3_days"
+    RETENTION_3_DAYS_DESKTOP = "active_in_last_3_days_legacy"
     SEARCH_COUNT = "search_count"
 
     DAU_METRIC = {
diff --git a/experimenter/experimenter/jetstream/results_manager.py b/experimenter/experimenter/jetstream/results_manager.py
index c68c5fc95..f26fc4e0e 100644
--- a/experimenter/experimenter/jetstream/results_manager.py
+++ b/experimenter/experimenter/jetstream/results_manager.py
@@ -316,16 +316,14 @@ def check_valid_point(point):
     def get_kpi_metrics(
         self, analysis_basis, segment, reference_branch, window="overall"
     ):
+        kpi_metrics = [m.copy() for m in NimbusConstants.KPI_METRICS]
 
-        kpi_metrics = NimbusConstants.KPI_METRICS.copy()
-
-        # 3-day retention is only available for Desktop experiments
-        if self.experiment.application != self.experiment.Application.DESKTOP:
-            kpi_metrics = [
-                m
-                for m in kpi_metrics
-                if m.get("slug") != NimbusConstants.RETENTION_3_DAYS
-            ]
+        # For desktop experiments, use legacy version of metric until Glean migration
+        if self.experiment.application == self.experiment.Application.DESKTOP:
+            for m in kpi_metrics:
+                if m.get("slug") == NimbusConstants.RETENTION_3_DAYS:
+                    m["slug"] = NimbusConstants.RETENTION_3_DAYS_DESKTOP
+                    break
 
         window_results = self.get_window_results(analysis_basis, segment, window)
         other_metrics = (
diff --git a/experimenter/experimenter/jetstream/tests/test_results_manager.py b/experimenter/experimenter/jetstream/tests/test_results_manager.py
index 9950718a5..59a6a20bb 100644
--- a/experimenter/experimenter/jetstream/tests/test_results_manager.py
+++ b/experimenter/experimenter/jetstream/tests/test_results_manager.py
@@ -2642,33 +2642,53 @@ def test_metrics_have_data_different_windows(self, results_data, expected):
             expected,
         )
 
-    def test_get_kpi_metrics_excludes_3day_retention_for_non_desktop(self):
-        fenix_outcome = Outcomes.get_by_slug_and_application(
-            "fenix_outcome", NimbusExperiment.Application.FENIX
-        )
-        fenix_experiment = NimbusExperimentFactory.create(
-            application=NimbusExperiment.Application.FENIX,
-            primary_outcomes=[fenix_outcome.slug],
-            secondary_outcomes=[],
+    @parameterized.expand(
+        [
+            (
+                NimbusExperiment.Application.DESKTOP,
+                [
+                    "client_level_daily_active_users_v2",
+                    "retained",
+                    "search_count",
+                    "active_in_last_3_days_legacy",
+                ],
+            ),
+            (
+                NimbusExperiment.Application.FENIX,
+                [
+                    "client_level_daily_active_users_v2",
+                    "retained",
+                    "search_count",
+                    "active_in_last_3_days",
+                ],
+            ),
+            (
+                NimbusExperiment.Application.IOS,
+                [
+                    "client_level_daily_active_users_v2",
+                    "retained",
+                    "search_count",
+                    "active_in_last_3_days",
+                ],
+            ),
+        ]
+    )
+    def test_get_kpi_metrics_by_application(self, application, expected_metric_slugs):
+        experiment = NimbusExperimentFactory.create(
+            application=application,
         )
         NimbusBranchFactory.create(
-            experiment=fenix_experiment, name="Branch A", slug="branch-a"
+            experiment=experiment, name="Branch A", slug="branch-a"
         )
         NimbusBranchFactory.create(
-            experiment=fenix_experiment, name="Branch B", slug="branch-b"
+            experiment=experiment, name="Branch B", slug="branch-b"
         )
 
-        fenix_results_manager = ExperimentResultsManager(fenix_experiment)
-        kpi_metrics = fenix_results_manager.get_kpi_metrics(
-            "enrollments", "all", "branch-a"
-        )
+        results_manager = ExperimentResultsManager(experiment)
+        kpi_metrics = results_manager.get_kpi_metrics("enrollments", "all", "branch-a")
 
         slugs = [metric["slug"] for metric in kpi_metrics]
-        self.assertNotIn("active_in_last_3_days_legacy", slugs)
-
-        # Verify base KPI metrics are still present
-        self.assertIn("retained", slugs)
-        self.assertIn("search_count", slugs)
+        self.assertEqual(set(slugs), set(expected_metric_slugs))
 
     @parameterized.expand(
         [