diff --git a/pkg/app/piped/driftdetector/cloudrun/detector.go b/pkg/app/piped/driftdetector/cloudrun/detector.go
index a3fb460a3e..143da87ba5 100644
--- a/pkg/app/piped/driftdetector/cloudrun/detector.go
+++ b/pkg/app/piped/driftdetector/cloudrun/detector.go
@@ -47,7 +47,7 @@ type secretDecrypter interface {
 }
 
 type reporter interface {
-	ReportApplicationSyncState(ctx context.Context, appID string, state model.ApplicationSyncState) error
+	ReportApplicationSyncState(ctx context.Context, app model.Application, state model.ApplicationSyncState) error
 }
 
 type Detector interface {
@@ -219,7 +219,7 @@ func (d *detector) checkApplication(ctx context.Context, app *model.Application,
 
 	state := makeSyncState(result, headCommit.Hash)
 
-	return d.reporter.ReportApplicationSyncState(ctx, app.Id, state)
+	return d.reporter.ReportApplicationSyncState(ctx, *app, state)
 }
 
 func (d *detector) loadHeadServiceManifest(app *model.Application, repo git.Repo, headCommit git.Commit) (provider.ServiceManifest, error) {
diff --git a/pkg/app/piped/driftdetector/detector.go b/pkg/app/piped/driftdetector/detector.go
index 4960aa4fb4..daf47cfa2b 100644
--- a/pkg/app/piped/driftdetector/detector.go
+++ b/pkg/app/piped/driftdetector/detector.go
@@ -190,9 +190,9 @@ func (d *detector) Run(ctx context.Context) error {
 	return nil
 }
 
-func (d *detector) ReportApplicationSyncState(ctx context.Context, appID string, state model.ApplicationSyncState) error {
+func (d *detector) ReportApplicationSyncState(ctx context.Context, app model.Application, state model.ApplicationSyncState) error {
 	d.mu.RLock()
-	curState, ok := d.syncStates[appID]
+	curState, ok := d.syncStates[app.Id]
 	d.mu.RUnlock()
 
 	if ok && !curState.HasChanged(state) {
@@ -200,22 +200,41 @@ func (d *detector) ReportApplicationSyncState(ctx context.Context, appID string,
 	}
 
 	_, err := d.apiClient.ReportApplicationSyncState(ctx, &pipedservice.ReportApplicationSyncStateRequest{
-		ApplicationId: appID,
+		ApplicationId: app.Id,
 		State:         &state,
 	})
 	if err != nil {
 		d.logger.Error("failed to report application sync state",
-			zap.String("application-id", appID),
+			zap.String("application-id", app.Id),
 			zap.Any("state", state),
 			zap.Error(err),
 		)
 		return err
 	}
-	// TODO notify a event of NotificationEventType_EVENT_APPLICATION_OUT_OF_SYNC
-	// TODO notify a event of NotificationEventType_EVENT_APPLICATION_SYNCED
+
+	defer func() {
+		switch state.Status {
+		case model.ApplicationSyncStatus_SYNCED:
+			d.notifier.Notify(model.NotificationEvent{
+				Type: model.NotificationEventType_EVENT_APPLICATION_SYNCED,
+				Metadata: &model.NotificationEventApplicationSynced{
+					Application: &app,
+					State:       &state,
+				},
+			})
+		case model.ApplicationSyncStatus_OUT_OF_SYNC:
+			d.notifier.Notify(model.NotificationEvent{
+				Type: model.NotificationEventType_EVENT_APPLICATION_OUT_OF_SYNC,
+				Metadata: &model.NotificationEventApplicationOutOfSync{
+					Application: &app,
+					State:       &state,
+				},
+			})
+		}
+	}()
 
 	d.mu.Lock()
-	d.syncStates[appID] = state
+	d.syncStates[app.Id] = state
 	d.mu.Unlock()
 
 	return nil
diff --git a/pkg/app/piped/driftdetector/kubernetes/detector.go b/pkg/app/piped/driftdetector/kubernetes/detector.go
index 6eb37b67da..5681d6ec29 100644
--- a/pkg/app/piped/driftdetector/kubernetes/detector.go
+++ b/pkg/app/piped/driftdetector/kubernetes/detector.go
@@ -47,7 +47,7 @@ type secretDecrypter interface {
 }
 
 type reporter interface {
-	ReportApplicationSyncState(ctx context.Context, appID string, state model.ApplicationSyncState) error
+	ReportApplicationSyncState(ctx context.Context, app model.Application, state model.ApplicationSyncState) error
 }
 
 type Detector interface {
@@ -218,7 +218,7 @@ func (d *detector) checkApplication(ctx context.Context, app *model.Application,
 
 	state := makeSyncState(result, headCommit.Hash)
 
-	return d.reporter.ReportApplicationSyncState(ctx, app.Id, state)
+	return d.reporter.ReportApplicationSyncState(ctx, *app, state)
 }
 
 func (d *detector) loadHeadManifests(ctx context.Context, app *model.Application, repo git.Repo, headCommit git.Commit, watchingResourceKinds []provider.APIVersionKind) ([]provider.Manifest, error) {
diff --git a/pkg/app/piped/driftdetector/terraform/detector.go b/pkg/app/piped/driftdetector/terraform/detector.go
index 7edd099c86..15db724a34 100644
--- a/pkg/app/piped/driftdetector/terraform/detector.go
+++ b/pkg/app/piped/driftdetector/terraform/detector.go
@@ -48,7 +48,7 @@ type secretDecrypter interface {
 }
 
 type reporter interface {
-	ReportApplicationSyncState(ctx context.Context, appID string, state model.ApplicationSyncState) error
+	ReportApplicationSyncState(ctx context.Context, app model.Application, state model.ApplicationSyncState) error
 }
 
 type Detector interface {
@@ -278,7 +278,7 @@ func (d *detector) checkApplication(ctx context.Context, app *model.Application,
 		return err
 	}
 
-	return d.reporter.ReportApplicationSyncState(ctx, app.Id, *state)
+	return d.reporter.ReportApplicationSyncState(ctx, *app, *state)
 }
 
 func makeSyncState(r provider.PlanResult, commit string) (*model.ApplicationSyncState, error) {