diff --git a/.codecov.yml b/.codecov.yml
new file mode 100644
index 0000000..c1c3711
--- /dev/null
+++ b/.codecov.yml
@@ -0,0 +1,3 @@
+ignore:
+  - catch.hpp
+  - catch_main.hpp
diff --git a/.travis.yml b/.travis.yml
index 2cf3b94..ef64ab0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -54,6 +54,8 @@ matrix:
     - os: osx
       osx_image: xcode10
       compiler: clang
+      addons: { homebrew: { packages: ["lcov"] } }
+      after_success: ./scripts/upload_coverage.sh
 before_install:
   - eval "${MATRIX_EVAL}"
 script:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ced404f..ac9384b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,36 @@
 cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 project(kari)
 
+#
+# coverage mode
+#
+
+option(KARI_BUILD_WITH_COVERAGE "Build with coverage" OFF)
+if(KARI_BUILD_WITH_COVERAGE AND (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang"))
+    add_definitions(-DKARI_BUILD_WITH_COVERAGE)
+    set(KARI_COVERAGE_FLAGS "--coverage")
+    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${KARI_COVERAGE_FLAGS}")
+    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${KARI_COVERAGE_FLAGS}")
+    set(CMAKE_LINKER_FLAGS_DEBUG "${CMAKE_LINKER_FLAGS_DEBUG} ${KARI_COVERAGE_FLAGS}")
+endif()
+
+#
+# sanitizer mode
+#
+
+option(KARI_BUILD_WITH_SANITIZER "Build with sanitizer" OFF)
+if(KARI_BUILD_WITH_SANITIZER AND (CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang"))
+    add_definitions(-DKARI_BUILD_WITH_SANITIZER)
+    set(KARI_SANITIZER_FLAGS "-fno-omit-frame-pointer -fsanitize=address")
+    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${KARI_SANITIZER_FLAGS}")
+    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${KARI_SANITIZER_FLAGS}")
+    set(CMAKE_LINKER_FLAGS_DEBUG "${CMAKE_LINKER_FLAGS_DEBUG} ${KARI_SANITIZER_FLAGS}")
+endif()
+
+#
+# tests executable
+#
+
 file(GLOB test_sources "*.cpp" "*.hpp")
 add_executable(${PROJECT_NAME} ${test_sources})
 
diff --git a/README.md b/README.md
index 7ba63cf..5b7af27 100644
--- a/README.md
+++ b/README.md
@@ -4,22 +4,25 @@
 
 [![travis][badge.travis]][travis]
 [![appveyor][badge.appveyor]][appveyor]
+[![codecov][badge.codecov]][codecov]
 [![language][badge.language]][language]
 [![license][badge.license]][license]
 [![godbolt][badge.godbolt]][godbolt]
 [![wandbox][badge.wandbox]][wandbox]
 [![paypal][badge.paypal]][paypal]
 
-[badge.travis]: https://img.shields.io/travis/BlackMATov/kari.hpp/master.svg?logo=travis&style=shield
-[badge.appveyor]: https://img.shields.io/appveyor/ci/BlackMATov/kari-hpp/master.svg?logo=appveyor&style=shield
-[badge.language]: https://img.shields.io/badge/language-C%2B%2B14-red.svg?style=shield
-[badge.license]: https://img.shields.io/badge/license-MIT-blue.svg?style=shield
-[badge.godbolt]: https://img.shields.io/badge/try%20it-on%20godbolt-orange.svg?style=shield
-[badge.wandbox]: https://img.shields.io/badge/try%20it-on%20wandbox-5cb85c.svg?style=shield
-[badge.paypal]: https://img.shields.io/badge/donate-PayPal-orange.svg?logo=paypal&colorA=00457C&style=shield
+[badge.travis]: https://img.shields.io/travis/BlackMATov/kari.hpp/master.svg?logo=travis
+[badge.appveyor]: https://img.shields.io/appveyor/ci/BlackMATov/kari-hpp/master.svg?logo=appveyor
+[badge.codecov]: https://img.shields.io/codecov/c/github/BlackMATov/kari.hpp/master.svg?logo=codecov
+[badge.language]: https://img.shields.io/badge/language-C%2B%2B14-red.svg
+[badge.license]: https://img.shields.io/badge/license-MIT-blue.svg
+[badge.godbolt]: https://img.shields.io/badge/try%20it-on%20godbolt-orange.svg
+[badge.wandbox]: https://img.shields.io/badge/try%20it-on%20wandbox-5cb85c.svg
+[badge.paypal]: https://img.shields.io/badge/donate-PayPal-orange.svg?logo=paypal&colorA=00457C
 
 [travis]: https://travis-ci.org/BlackMATov/kari.hpp
 [appveyor]: https://ci.appveyor.com/project/BlackMATov/kari-hpp
+[codecov]: https://codecov.io/gh/BlackMATov/kari.hpp
 [language]: https://en.wikipedia.org/wiki/C%2B%2B14
 [license]: https://github.com/BlackMATov/kari.hpp/blob/master/LICENSE.md
 [godbolt]: https://godbolt.org/g/XPBgjY
diff --git a/scripts/upload_coverage.sh b/scripts/upload_coverage.sh
new file mode 100755
index 0000000..d13a427
--- /dev/null
+++ b/scripts/upload_coverage.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+set -e
+
+BUILD_DIR=`dirname "$BASH_SOURCE"`/../build
+mkdir -p $BUILD_DIR/coverage
+cd $BUILD_DIR/coverage
+cmake -DCMAKE_BUILD_TYPE=Debug -DECS_BUILD_WITH_COVERAGE=ON ../..
+cmake --build . -- -j8
+
+lcov -d . -z
+ctest --verbose
+
+lcov -d . -c -o "coverage.info"
+lcov -r "coverage.info" "*/usr/*" "*/catch.hpp" "*/catch_main.cpp" -o "coverage.info"
+lcov -l "coverage.info"
+
+bash <(curl -s https://codecov.io/bash) || echo "Codecov did not collect coverage reports"