diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 49ce4da..4bf0fd1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,12 +15,12 @@ jobs:
         config:
           - {name: "Ubuntu Clang 20", os: ubuntu-24.04, toolchain: "clang-20", clang_version: 20, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Debug;Asan\" "}
           # Note: clang-19 + Asan setup causes errors on some platforms. Temporary skip some checks via .asan_options.
-          - {name: "Ubuntu Clang 19", os: ubuntu-24.04, toolchain: "clang-19", clang_version: 19, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Debug;Asan\" ", asan_options: "new_delete_type_mismatch=0"}
-          - {name: "Ubuntu Clang 18", os: ubuntu-24.04, toolchain: "clang-18", clang_version: 18, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Debug;Asan\" "}
-          - {name: "Ubuntu Clang 17", os: ubuntu-24.04, toolchain: "clang-17", clang_version: 17, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Debug;Asan\" "}
-          - {name: "Ubuntu GCC 14", os: ubuntu-24.04, toolchain: "gcc-14", cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Debug;Asan\" "}
-          - {name: "Ubuntu GCC 13", os: ubuntu-24.04, toolchain: "gcc-13",  cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Debug;Asan\" "}
-          - {name: "Ubuntu GCC 12", os: ubuntu-24.04, toolchain: "gcc-12",  cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Debug;Asan\" "}
+          - {name: "Ubuntu Clang 19", os: ubuntu-24.04, toolchain: "clang-19", clang_version: 19, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" ", asan_options: "new_delete_type_mismatch=0"}
+          - {name: "Ubuntu Clang 18", os: ubuntu-24.04, toolchain: "clang-18", clang_version: 18, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
+          - {name: "Ubuntu Clang 17", os: ubuntu-24.04, toolchain: "clang-17", clang_version: 17, installed_clang_version: 17, cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
+          - {name: "Ubuntu GCC 14", os: ubuntu-24.04, toolchain: "gcc-14", cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan;Gcov\" ", coverage: true}
+          - {name: "Ubuntu GCC 13", os: ubuntu-24.04, toolchain: "gcc-13",  cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
+          - {name: "Ubuntu GCC 12", os: ubuntu-24.04, toolchain: "gcc-12",  cmake_args: "-G \"Ninja Multi-Config\" -DCMAKE_CONFIGURATION_TYPES=\"RelWithDebInfo;Asan\" "}
     steps:
       - uses: actions/checkout@v3
         with:
@@ -78,7 +78,11 @@ jobs:
           sudo apt-get install g++-${GCC_VERSION} gcc-${GCC_VERSION}
           find /usr/lib/x86_64-linux-gnu/ -name libstdc++.so*
           g++-${GCC_VERSION} --version
-          type g++-${GCC_VERSION}
+      - name: Install Gcovr
+        if: matrix.config.coverage
+        run: |
+          set -x
+          sudo apt-get install gcovr
       - name: CMake Configure
         run: |
           set -x
@@ -108,8 +112,31 @@ jobs:
       - name: Install
         run: |
           set -x
+          cmake --install .build --config RelWithDebInfo --component beman_optional26_development --verbose
+      - name: CMake Gcov Build
+        if: matrix.config.coverage
+        run: |
+          set -x
+          cmake --build .build --config Gcov --target all_verify_interface_header_sets -- -k 0
+          cmake --build .build --config Gcov --target all -- -k 0
+      - name: CMake Gcov Test
+        if: matrix.config.coverage
+        run: |
+          set -x
+          ctest --build-config Gcov --output-on-failure --test-dir .build
+      - name: Generate Coverage
+        if: matrix.config.coverage
+        run: |
+          set -x
+          cmake --build .build --config Gcov --target process_coverage -- -k 0
+      - name: Coveralls
+        if: matrix.config.coverage
+        uses: coverallsapp/github-action@main
+        with:
+          file: ${{runner.workspace}}/optional26/.build/coverage.json
+          github-token: ${{ secrets.GITHUB_TOKEN }}
           cmake --install .build --config RelWithDebInfo --verbose
       - name: CMake Debug Workflow
         run: |
           set -x
-          cmake --workflow --preset ${{ matrix.config.toolchain }}
+          cmake --workflow --preset ${{ matrix.config.toolchain }}
\ No newline at end of file
diff --git a/README.md b/README.md
index 0ac6776..df5e9d4 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 SPDX-License-Identifier: 2.0 license with LLVM exceptions
 -->
 
-![CI Tests](https://github.com/bemanproject/optional26/actions/workflows/ci.yml/badge.svg)
+![CI Tests](https://github.com/bemanproject/optional26/actions/workflows/ci.yml/badge.svg) [![Coverage](https://coveralls.io/repos/github/bemanproject/optional26/badge.svg?branch=main)](https://coveralls.io/github/bemanproject/optional26?branch=main)
 
 This repository implements `std::optional` extensions targeting C++26. The `beman.optional26` library aims to evaluate
 the stability, the usability, and the performance of these proposed changes before they are officially adopted by WG21
diff --git a/cmake/gcovr.cfg.in b/cmake/gcovr.cfg.in
index 7dddd99..6b2523d 100644
--- a/cmake/gcovr.cfg.in
+++ b/cmake/gcovr.cfg.in
@@ -9,3 +9,5 @@ html-self-contained = yes
 print-summary = yes
 filter = .*/beman/optional26/.*
 exclude = .*\.t\.cpp
+coveralls = coverage.json
+coveralls-pretty = yes