diff --git a/build.sh b/build.sh
new file mode 100644
index 0000000..78ce466
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Build firka and/or firka_wear with version from pubspec + short git SHA.
+# Usage: ./build.sh [firka|firka_wear|all]
+# Default (no args) builds both.
+
+ROOT="$(cd "$(dirname "$0")" && pwd)"
+SHA=$(git -C "$ROOT" rev-parse --short HEAD)
+
+build_app() {
+  local APP="$1"
+  local PUBSPEC="$ROOT/$APP/pubspec.yaml"
+  if [[ ! -f "$PUBSPEC" ]]; then
+    echo "Not found: $PUBSPEC" >&2
+    return 1
+  fi
+
+  local VERSION_LINE BUILD_NUMBER BASE_VERSION BUILD_NAME
+  VERSION_LINE=$(grep -E '^\s*version:\s*' "$PUBSPEC" | head -1)
+  BASE_VERSION=$(echo "$VERSION_LINE" | sed -E 's/^[[:space:]]*version:[[:space:]]*([^+]+).*/\1/' | tr -d ' ')
+  BUILD_NUMBER=""
+  if [[ "$VERSION_LINE" == *+* ]]; then
+    BUILD_NUMBER=$(echo "$VERSION_LINE" | sed -E 's/^[[:space:]]*version:[[:space:]]*[^+]+\+([0-9]+).*/\1/')
+  fi
+  BUILD_NAME="${BASE_VERSION}-${SHA}"
+
+  echo "Building $APP: version $BUILD_NAME (build number: ${BUILD_NUMBER:-none})"
+  cd "$ROOT/$APP"
+
+  local FLUTTER_ARGS=(build appbundle --build-name="$BUILD_NAME" --verbose)
+  [[ -n "${BUILD_NUMBER:-}" ]] && FLUTTER_ARGS+=(--build-number="$BUILD_NUMBER")
+
+  flutter "${FLUTTER_ARGS[@]}"
+}
+
+case "${1:-all}" in
+  firka)      build_app firka ;;
+  firka_wear) build_app firka_wear ;;
+  all)        build_app firka && build_app firka_wear ;;
+  *)
+    echo "Usage: $0 [firka|firka_wear|all]" >&2
+    exit 1
+    ;;
+esac