diff --git a/Makefile b/Makefile
index 4ceea71..9cb2aff 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,15 @@
 SHELL := /bin/bash
 
-.PHONY: help packages clean-builds gradle-update docs
+.PHONY: help packages clean-builds gradle-update docs analyze test doctor
 
 help: ## Show available commands
 	@echo "Available commands:"
 	@echo ""
 	@echo "  make help             Show this help"
 	@echo "  make packages         Run 'flutter packages get' for all apps"
+	@echo "  make analyze          Run 'flutter analyze' for all apps"
+	@echo "  make test             Run 'flutter test' for all apps with tests"
+	@echo "  make doctor           Check every app for configuration drift"
 	@echo "  make clean-builds     Move all build folders to trash"
 	@echo "  make gradle-update    Upgrade Gradle wrappers"
 	@echo "  make docs             Regenerate documentation/EXAMPLES.md"
@@ -24,6 +27,15 @@ help: ## Show available commands
 packages: ## Run flutter packages get for all apps
 	./scripts/get_packages.sh
 
+analyze: ## Run flutter analyze for all apps
+	./scripts/analyze_all.sh
+
+test: ## Run flutter test for all apps that have tests
+	./scripts/test_all.sh
+
+doctor: ## Check all apps for configuration drift
+	./scripts/repo_doctor.sh
+
 clean-builds: ## Move all build folders to trash
 	./scripts/delete_build_folder.sh
 
diff --git a/bmi_calculator/android/gradle/wrapper/gradle-wrapper.properties b/bmi_calculator/android/gradle/wrapper/gradle-wrapper.properties
index a20f2c4..1e922f4 100644
--- a/bmi_calculator/android/gradle/wrapper/gradle-wrapper.properties
+++ b/bmi_calculator/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.7.0-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-all.zip
diff --git a/documentation/MAINTENANCE.md b/documentation/MAINTENANCE.md
index 825f7ab..24e4364 100644
--- a/documentation/MAINTENANCE.md
+++ b/documentation/MAINTENANCE.md
@@ -8,6 +8,9 @@ All maintenance commands are available through the `Makefile` at the repository
 | --- | --- |
 | `make help` | Show all available commands |
 | `make packages` | Run `flutter packages get` for all example apps |
+| `make analyze` | Run `flutter analyze` for all example apps |
+| `make test` | Run `flutter test` for all example apps that have tests |
+| `make doctor` | Check every app for configuration drift |
 | `make clean-builds` | Move all build folders to trash |
 | `make gradle-update` | Upgrade Gradle wrappers to the latest version |
 | `make docs` | Regenerate `documentation/EXAMPLES.md` from the app folders |
@@ -16,6 +19,17 @@ All maintenance commands are available through the `Makefile` at the repository
 
 `make gradle-update` upgrades the Gradle wrapper of every example app.
 
+## Drift checks
+
+`make doctor` scans every example app and reports configuration drift: non-standard
+SDK constraints, missing `analysis_options.yaml` or `flutter_lints`, pubspec names
+that do not match their folder, Android `applicationId`s outside the
+`github.nisrulz.*` convention, non-standard Gradle versions, apps missing from
+`EXAMPLES.md`, and generated files accidentally tracked in git. It exits non-zero
+when issues are found, so you can use it as a pre-commit gate.
+
+Run `make analyze` after changing any app to confirm `flutter analyze` is clean.
+
 | Option | Description |
 | --- | --- |
 | `VERSION=<x.y.z>` | Target a specific Gradle version. Default: latest from GitHub |
@@ -37,6 +51,7 @@ in `<app>/android/app/` before they can be built:
 
 - `firebase_google_authentication`
 - `google_signin`
+- `push_notifications`
 - `using_firebase_db`
 
 The file is never committed because it contains your Firebase project config.
diff --git a/push_notifications/android/gradle/wrapper/gradle-wrapper.properties b/push_notifications/android/gradle/wrapper/gradle-wrapper.properties
index 3fa8f86..69dd0d0 100644
--- a/push_notifications/android/gradle/wrapper/gradle-wrapper.properties
+++ b/push_notifications/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,7 +1,9 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.7.0-bin.zip
 networkTimeout=10000
+retries=0
+retryBackOffMs=500
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/scripts/analyze_all.sh b/scripts/analyze_all.sh
new file mode 100755
index 0000000..813f617
--- /dev/null
+++ b/scripts/analyze_all.sh
@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Runs `flutter analyze` in every example app and reports the results.
+# Exits non-zero if any app has analyzer issues.
+
+source "$(dirname "${BASH_SOURCE[0]}")/common.sh"
+
+clean=0
+issues=0
+failed=0
+apps_with_issues=()
+
+analyze_app() {
+	local dir="$1"
+	local app
+	app=$(basename "$dir")
+
+	local out
+	if ! out=$(cd "$dir" && flutter analyze 2>&1); then
+		failed=$((failed + 1))
+		return
+	fi
+
+	local summary
+	summary=$(echo "$out" | tail -1)
+	if echo "$out" | grep -q "No issues found"; then
+		clean=$((clean + 1))
+	else
+		issues=$((issues + 1))
+		apps_with_issues+=("$app")
+		printf "  %-30s %s\n" "$app" "$summary"
+	fi
+}
+
+separator
+echo "  Running flutter analyze for all Flutter apps:"
+for_each_app pubspec.yaml analyze_app
+separator
+printf "  %-16s %s\n" "Clean:" "$clean"
+printf "  %-16s %s\n" "With issues:" "$issues"
+printf "  %-16s %s\n" "Failed to run:" "$failed"
+if [ "${#apps_with_issues[@]}" -gt 0 ]; then
+	echo "  Apps with issues:"
+	printf "    %s\n" "${apps_with_issues[@]}"
+fi
+separator
+
+[ "$issues" -eq 0 ] && [ "$failed" -eq 0 ]
\ No newline at end of file
diff --git a/scripts/repo_doctor.sh b/scripts/repo_doctor.sh
new file mode 100755
index 0000000..e6c8fed
--- /dev/null
+++ b/scripts/repo_doctor.sh
@@ -0,0 +1,104 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+# Reports repository drift across all example apps.
+# Run after adding or modifying an app, or before a release.
+# Exits non-zero if any issues are found.
+
+source "$(dirname "${BASH_SOURCE[0]}")/common.sh"
+
+STD_SDK='sdk: ">=3.0.0 <4.0.0"'
+GRADLE_MODE="9.7.0"
+
+issues=0
+
+report() {
+	local label="$1"
+	shift
+	if [ "$#" -eq 0 ]; then
+		return
+	fi
+	issues=1
+	echo ""
+	echo "  $label:"
+	for item in "$@"; do
+		printf "    %s\n" "$item"
+	done
+}
+
+collect() {
+	local label="$1"
+	shift
+	local found=()
+	for app in ./*; do
+		if [ -f "$app/pubspec.yaml" ]; then
+			local name
+			name=$(basename "$app")
+			"$@" "$app" "$name" && found+=("$name")
+		fi
+	done
+	report "$label" "${found[@]}"
+}
+
+check_sdk() {
+	local app="$1" name="$2"
+	! grep -qF "$STD_SDK" "$app/pubspec.yaml"
+}
+
+check_lints() {
+	local app="$1" name="$2"
+	[ ! -f "$app/analysis_options.yaml" ] || ! grep -q "flutter_lints" "$app/pubspec.yaml"
+}
+
+check_name() {
+	local app="$1" name="$2"
+	[ "$(grep -m1 '^name:' "$app/pubspec.yaml" | awk '{print $2}')" != "$name" ]
+}
+
+check_android_id() {
+	local app="$1" name="$2"
+	local f="$app/android/app/build.gradle.kts"
+	[ ! -f "$f" ] && return 1
+	! grep -q 'namespace = "github\.nisrulz\.' "$f"
+}
+
+check_gradle() {
+	local app="$1" name="$2"
+	local props="$app/android/gradle/wrapper/gradle-wrapper.properties"
+	[ ! -f "$props" ] && return 1
+	! grep -q "$GRADLE_MODE" "$props"
+}
+
+check_docs() {
+	local app="$1" name="$2"
+	! grep -q "(/$name)" documentation/EXAMPLES.md
+}
+
+separator
+echo "  Repository doctor:"
+echo "  Checking all apps for configuration drift."
+
+collect "Apps with a non-standard SDK constraint" check_sdk
+collect "Apps missing analysis_options.yaml or flutter_lints" check_lints
+collect "Apps whose pubspec name does not match the folder" check_name
+collect "Apps not using the github.nisrulz.* Android applicationId" check_android_id
+collect "Apps not on the standard Gradle version" check_gradle
+collect "Apps missing from documentation/EXAMPLES.md (run 'make docs')" check_docs
+
+# Tracked generated files that should not be in git.
+tracked_generated=$(git ls-files | grep -E "\.dart_tool/|GeneratedPluginRegistrant|\.flutter-plugins-dependencies|pubspec\.lock" || true)
+if [ -n "$tracked_generated" ]; then
+	issues=1
+	echo ""
+	echo "  Tracked generated files (remove with 'git rm --cached'):"
+	echo "$tracked_generated" | sed 's/^/    /'
+fi
+
+separator
+if [ "$issues" -eq 0 ]; then
+	echo "  All checks passed."
+else
+	echo "  Issues found. Fix them before committing."
+	exit 1
+fi
+separator
\ No newline at end of file
diff --git a/scripts/test_all.sh b/scripts/test_all.sh
new file mode 100755
index 0000000..5ff7401
--- /dev/null
+++ b/scripts/test_all.sh
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Runs `flutter test` in every example app that has a test directory.
+# Exits non-zero if any test run fails.
+
+source "$(dirname "${BASH_SOURCE[0]}")/common.sh"
+
+passed=0
+failed=0
+skipped=0
+failed_apps=()
+
+run_tests() {
+	local dir="$1"
+	local app
+	app=$(basename "$dir")
+
+	if [ ! -d "$dir/test" ]; then
+		skipped=$((skipped + 1))
+		return
+	fi
+
+	if (cd "$dir" && flutter test >/dev/null 2>&1); then
+		passed=$((passed + 1))
+	else
+		failed=$((failed + 1))
+		failed_apps+=("$app")
+	fi
+}
+
+separator
+echo "  Running flutter test for all Flutter apps:"
+for_each_app pubspec.yaml run_tests
+separator
+printf "  %-16s %s\n" "Passed:" "$passed"
+printf "  %-16s %s\n" "Failed:" "$failed"
+printf "  %-16s %s\n" "No tests:" "$skipped"
+if [ "${#failed_apps[@]}" -gt 0 ]; then
+	echo "  Failed apps:"
+	printf "    %s\n" "${failed_apps[@]}"
+fi
+separator
+
+[ "$failed" -eq 0 ]
\ No newline at end of file