diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9cf4377..1f1c7bd 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -28,6 +28,7 @@ jobs:
             target: x86_64-pc-windows-msvc
             args: "--bundles nsis"
     runs-on: ${{ matrix.os }}
+    timeout-minutes: 120
     steps:
       - uses: actions/checkout@fbc6f3992d24b796d5a048ff273f7fcc4a7b6c09
 
@@ -58,18 +59,59 @@ jobs:
           test -n "$TAURI_SIGNING_PRIVATE_KEY"
           test -n "$TAURI_SIGNING_PRIVATE_KEY_PASSWORD"
 
-      - name: build ad-hoc signed macOS release
+      - name: verify Apple signing configuration
+        if: startsWith(matrix.os, 'macos')
+        shell: bash
+        env:
+          APPLE_CERTIFICATE: ${{ secrets.APPLE_CERTIFICATE }}
+          APPLE_CERTIFICATE_PASSWORD: ${{ secrets.APPLE_CERTIFICATE_PASSWORD }}
+          APPLE_SIGNING_IDENTITY: ${{ secrets.APPLE_SIGNING_IDENTITY }}
+          APPLE_API_KEY: ${{ secrets.APPLE_API_KEY }}
+          APPLE_API_ISSUER: ${{ secrets.APPLE_API_ISSUER }}
+          APPLE_API_PRIVATE_KEY: ${{ secrets.APPLE_API_PRIVATE_KEY }}
+        run: |
+          test -n "$APPLE_CERTIFICATE"
+          test -n "$APPLE_CERTIFICATE_PASSWORD"
+          test -n "$APPLE_SIGNING_IDENTITY"
+          test -n "$APPLE_API_KEY"
+          test -n "$APPLE_API_ISSUER"
+          test -n "$APPLE_API_PRIVATE_KEY"
+
+      - name: prepare Apple notarization key
+        if: startsWith(matrix.os, 'macos')
+        shell: bash
+        env:
+          APPLE_API_KEY: ${{ secrets.APPLE_API_KEY }}
+          APPLE_API_PRIVATE_KEY: ${{ secrets.APPLE_API_PRIVATE_KEY }}
+        run: |
+          umask 077
+          APPLE_API_KEY_PATH="$RUNNER_TEMP/AuthKey_${APPLE_API_KEY}.p8"
+          printf '%s' "$APPLE_API_PRIVATE_KEY" | base64 --decode -o "$APPLE_API_KEY_PATH"
+          test -s "$APPLE_API_KEY_PATH"
+          printf 'APPLE_API_KEY_PATH=%s\n' "$APPLE_API_KEY_PATH" >> "$GITHUB_ENV"
+
+      - name: import Apple Developer ID certificate
+        if: startsWith(matrix.os, 'macos')
+        uses: apple-actions/import-codesign-certs@5142e029c445c10ffc7149d172e540235a065466
+        with:
+          p12-file-base64: ${{ secrets.APPLE_CERTIFICATE }}
+          p12-password: ${{ secrets.APPLE_CERTIFICATE_PASSWORD }}
+
+      - name: build signed and notarized macOS release
         if: startsWith(matrix.os, 'macos')
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          APPLE_SIGNING_IDENTITY: "-"
+          APPLE_SIGNING_IDENTITY: ${{ secrets.APPLE_SIGNING_IDENTITY }}
+          APPLE_API_KEY: ${{ secrets.APPLE_API_KEY }}
+          APPLE_API_ISSUER: ${{ secrets.APPLE_API_ISSUER }}
+          APPLE_API_KEY_PATH: ${{ env.APPLE_API_KEY_PATH }}
           TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
           TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
         uses: tauri-apps/tauri-action@1deb371b0cd8bd54025b384f1cd735e725c4060f
         with:
           tagName: v__VERSION__
           releaseName: proxybench v__VERSION__
-          releaseBody: Preview builds made without certificates yet. macOS DMGs need right-click Open on first launch. The Windows NSIS setup wizard may trigger SmartScreen; choose More info, then Run anyway.
+          releaseBody: macOS DMGs are Developer ID signed and notarized by Apple. The Windows NSIS setup wizard is unsigned and may trigger SmartScreen; choose More info, then Run anyway.
           releaseDraft: true
           uploadUpdaterJson: true
           uploadUpdaterSignatures: true
@@ -77,6 +119,55 @@ jobs:
           tauriScript: bun run tauri
           args: ${{ matrix.args }}
 
+      - name: notarize and verify macOS DMG
+        if: startsWith(matrix.os, 'macos')
+        shell: bash
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          APPLE_API_KEY: ${{ secrets.APPLE_API_KEY }}
+          APPLE_API_ISSUER: ${{ secrets.APPLE_API_ISSUER }}
+          APPLE_API_KEY_PATH: ${{ env.APPLE_API_KEY_PATH }}
+        run: |
+          APP_PATH="src-tauri/target/${{ matrix.target }}/release/bundle/macos/proxybench.app"
+          DMG_DIR="src-tauri/target/${{ matrix.target }}/release/bundle/dmg"
+          shopt -s nullglob
+          DMGS=("$DMG_DIR"/*.dmg)
+          test -d "$APP_PATH"
+          test "${#DMGS[@]}" -eq 1
+          DMG_PATH="${DMGS[0]}"
+
+          codesign --verify --deep --strict --verbose=2 "$APP_PATH"
+          APP_SIGNATURE=$(codesign -d --verbose=4 "$APP_PATH" 2>&1)
+          printf '%s\n' "$APP_SIGNATURE" | grep -F "Authority=Developer ID Application:"
+          printf '%s\n' "$APP_SIGNATURE" | grep -E 'flags=.*\(.*runtime.*\)'
+          xcrun stapler validate -v "$APP_PATH"
+          spctl --assess --type execute --verbose=4 "$APP_PATH"
+
+          NOTARY_RESULT=$(xcrun notarytool submit "$DMG_PATH" \
+            --key "$APPLE_API_KEY_PATH" \
+            --key-id "$APPLE_API_KEY" \
+            --issuer "$APPLE_API_ISSUER" \
+            --wait --timeout 30m --output-format json)
+          if ! printf '%s\n' "$NOTARY_RESULT" | jq -e '.status == "Accepted"'; then
+            SUBMISSION_ID=$(printf '%s\n' "$NOTARY_RESULT" | jq -er '.id')
+            xcrun notarytool log "$SUBMISSION_ID" \
+              --key "$APPLE_API_KEY_PATH" \
+              --key-id "$APPLE_API_KEY" \
+              --issuer "$APPLE_API_ISSUER"
+            exit 1
+          fi
+          xcrun stapler staple -v "$DMG_PATH"
+
+          codesign --verify --strict --verbose=2 "$DMG_PATH"
+          xcrun stapler validate -v "$DMG_PATH"
+          spctl --assess --type open --context context:primary-signature --verbose=4 "$DMG_PATH"
+          gh release upload "$GITHUB_REF_NAME" "$DMG_PATH" --clobber
+
+      - name: remove Apple notarization key
+        if: always() && startsWith(matrix.os, 'macos')
+        shell: bash
+        run: rm -f "$APPLE_API_KEY_PATH"
+
       - name: build Windows release
         if: startsWith(matrix.os, 'windows')
         uses: tauri-apps/tauri-action@1deb371b0cd8bd54025b384f1cd735e725c4060f
@@ -87,7 +178,7 @@ jobs:
         with:
           tagName: v__VERSION__
           releaseName: proxybench v__VERSION__
-          releaseBody: Preview builds made without certificates yet. macOS DMGs need right-click Open on first launch. The Windows NSIS setup wizard may trigger SmartScreen; choose More info, then Run anyway.
+          releaseBody: macOS DMGs are Developer ID signed and notarized by Apple. The Windows NSIS setup wizard is unsigned and may trigger SmartScreen; choose More info, then Run anyway.
           releaseDraft: true
           uploadUpdaterJson: true
           uploadUpdaterSignatures: true
diff --git a/.gitignore b/.gitignore
index ae5be03..3081e75 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 .env.*
 !.env.example
 .DS_Store
+.agents
 node_modules
 /build
 /.svelte-kit
diff --git a/AGENTS.md b/AGENTS.md
index 91dfca4..299409a 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -118,11 +118,16 @@ Bump `package.json`, `src-tauri/tauri.conf.json`, and `src-tauri/Cargo.toml`
 to the same `X.Y.Z`, merge to `main`, then tag `vX.Y.Z`.
 
 GitHub Actions (`.github/workflows/ci.yml` on `main` and pull requests,
-`.github/workflows/release.yml` on `vX.Y.Z`) builds macOS DMGs for Apple
-Silicon and Intel and a Windows NSIS setup wizard. macOS uses ad-hoc signing;
-Windows installers are unsigned.
+`.github/workflows/release.yml` on `vX.Y.Z`) builds Developer ID signed and
+Apple-notarized macOS DMGs for Apple Silicon and Intel and an unsigned Windows
+NSIS setup wizard.
 
 Updater releases require `TAURI_SIGNING_PRIVATE_KEY` and
 `TAURI_SIGNING_PRIVATE_KEY_PASSWORD`. The workflow keeps releases as drafts
 until `latest.json` contains macOS arm64, macOS x64, and Windows x64. Never
 replace published assets; ship a higher patch version.
+
+macOS releases require `APPLE_CERTIFICATE`, `APPLE_CERTIFICATE_PASSWORD`,
+`APPLE_SIGNING_IDENTITY`, `APPLE_API_KEY`, `APPLE_API_ISSUER`, and
+`APPLE_API_PRIVATE_KEY`. The certificate and API private key are base64
+encoded. Apple code signing is independent from updater signing.
diff --git a/README.md b/README.md
index 654fff3..c2f66d6 100644
--- a/README.md
+++ b/README.md
@@ -42,21 +42,18 @@ You do not need Git, GitHub, or a developer setup.
 1. Open the [latest release](https://github.com/Mathious6/proxybench/releases/latest).
 2. Download the file for your computer.
 
-| Your computer                           | File to download                         |
-| --------------------------------------- | ---------------------------------------- |
-| Mac with Apple Silicon (M1, M2, M3, M4) | macOS **arm64** `.dmg`                   |
-| Mac with Intel                          | macOS **x64** `.dmg`                      |
-| Windows 10 or 11                        | Windows **x64** setup `.exe`             |
+| Your computer                           | File to download             |
+| --------------------------------------- | ---------------------------- |
+| Mac with Apple Silicon (M1, M2, M3, M4) | macOS **arm64** `.dmg`       |
+| Mac with Intel                          | macOS **x64** `.dmg`         |
+| Windows 10 or 11                        | Windows **x64** setup `.exe` |
 
-On a Mac, open the DMG, drag **proxybench** into Applications, then right-click
-it and choose **Open** the first time. You only do that once.
+On a Mac, open the DMG, drag **proxybench** into Applications, then open it
+normally. MacOS builds are Developer ID signed and notarized by Apple.
 
 On Windows, run the setup wizard. If SmartScreen appears, choose **More
 info**, then **Run anyway**. Windows needs WebView2; Windows 10 and 11
-usually already have it.
-
-macOS builds use ad-hoc signing and are not notarized. Windows installers are
-unsigned.
+usually already have it. Windows installers are unsigned.
 
 ## Use