diff --git a/.appveyor.yml b/.appveyor.yml
index b3272fe..2130e34 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -7,34 +7,17 @@ platform:
   - x64
 
 configuration:
-  - Debug
   - Release
 
 for:
 
--
-  matrix:
-    only:
-      - platform: x86
-        configuration: Debug
-  build_script:
-    - scripts\build_debug_x86.bat
-
--
-  matrix:
-    only:
-      - platform: x64
-        configuration: Debug
-  build_script:
-    - scripts\build_debug_x64.bat
-
 -
   matrix:
     only:
       - platform: x86
         configuration: Release
   build_script:
-    - scripts\build_release_x86.bat
+    - .ci\build_windows_x86.bat
 
 -
   matrix:
@@ -42,4 +25,4 @@ for:
       - platform: x64
         configuration: Release
   build_script:
-    - scripts\build_release_x64.bat
+    - .ci\build_windows_x64.bat
diff --git a/.ci/build_coverage.sh b/.ci/build_coverage.sh
new file mode 100755
index 0000000..7c8a1aa
--- /dev/null
+++ b/.ci/build_coverage.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+set -e
+DIR="$( cd "$( dirname "${BASH_SOURCE}" )" && pwd )"
+
+ROOT_DIR="${DIR}/.."
+BUILD_DIR="${ROOT_DIR}/build/coverage"
+
+mkdir -p "${BUILD_DIR}"
+(cd "${BUILD_DIR}" && cmake "${ROOT_DIR}" -DCMAKE_BUILD_TYPE=Debug -DBUILD_WITH_COVERAGE=ON)
+(cd "${BUILD_DIR}" && cmake --build .)
+
+(cd "${BUILD_DIR}" && lcov -d . -z)
+(cd "${BUILD_DIR}" && ctest --verbose)
+
+(cd "${BUILD_DIR}" && lcov -d . -c -o "coverage.info")
+(cd "${BUILD_DIR}" && lcov -r "coverage.info" "*/usr/*" "*/untests/*" -o "coverage.info")
+(cd "${BUILD_DIR}" && lcov -l "coverage.info")
+
+bash <(curl -s https://codecov.io/bash) -f "${BUILD_DIR}/coverage.info" || echo "Codecov did not collect coverage reports"
diff --git a/.ci/build_darwin.sh b/.ci/build_darwin.sh
new file mode 100755
index 0000000..658e0c1
--- /dev/null
+++ b/.ci/build_darwin.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+set -e
+DIR="$( cd "$( dirname "${BASH_SOURCE}" )" && pwd )"
+
+ROOT_DIR="${DIR}/.."
+BUILD_DIR="${ROOT_DIR}/build/darwin_release"
+
+mkdir -p "${BUILD_DIR}"
+(cd "${BUILD_DIR}" && cmake "${ROOT_DIR}" -DCMAKE_BUILD_TYPE=Release)
+(cd "${BUILD_DIR}" && cmake --build .)
+(cd "${BUILD_DIR}" && ctest --verbose)
diff --git a/.ci/build_linux.sh b/.ci/build_linux.sh
new file mode 100755
index 0000000..c622bc4
--- /dev/null
+++ b/.ci/build_linux.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+set -e
+DIR="$( cd "$( dirname "${BASH_SOURCE}" )" && pwd )"
+
+ROOT_DIR="${DIR}/.."
+BUILD_DIR="${ROOT_DIR}/build/linux_release"
+
+mkdir -p "${BUILD_DIR}"
+(cd "${BUILD_DIR}" && cmake "${ROOT_DIR}" -DCMAKE_BUILD_TYPE=Release)
+(cd "${BUILD_DIR}" && cmake --build .)
+(cd "${BUILD_DIR}" && ctest --verbose)
diff --git a/.ci/build_windows_x64.bat b/.ci/build_windows_x64.bat
new file mode 100644
index 0000000..0fff1e8
--- /dev/null
+++ b/.ci/build_windows_x64.bat
@@ -0,0 +1,19 @@
+@echo off
+set DIR=%~dp0
+
+set ROOT_DIR=%DIR%..\
+set BUILD_DIR=%ROOT_DIR%build\windows_release_x64\
+
+if not exist %BUILD_DIR% mkdir %BUILD_DIR% || goto :error
+
+pushd %BUILD_DIR% || goto :error
+cmake %ROOT_DIR% -A x64 || goto :error
+cmake --build . --config Release || goto :error
+ctest --verbose || goto :error
+popd || goto :error
+
+goto :EOF
+
+:error
+echo Failed with error #%errorlevel%.
+exit /b %errorlevel%
diff --git a/.ci/build_windows_x86.bat b/.ci/build_windows_x86.bat
new file mode 100644
index 0000000..58f0a9f
--- /dev/null
+++ b/.ci/build_windows_x86.bat
@@ -0,0 +1,19 @@
+@echo off
+set DIR=%~dp0
+
+set ROOT_DIR=%DIR%..\
+set BUILD_DIR=%ROOT_DIR%build\windows_release_x86\
+
+if not exist %BUILD_DIR% mkdir %BUILD_DIR% || goto :error
+
+pushd %BUILD_DIR% || goto :error
+cmake %ROOT_DIR% -A Win32 || goto :error
+cmake --build . --config Release || goto :error
+ctest --verbose || goto :error
+popd || goto :error
+
+goto :EOF
+
+:error
+echo Failed with error #%errorlevel%.
+exit /b %errorlevel%
diff --git a/.travis.yml b/.travis.yml
index ebd9eac..49a377d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,116 +8,60 @@ jobs:
   include:
 
     #
-    # linux (g++-7)
+    # linux (g++)
     #
 
     - os: linux
-      dist: xenial
+      dist: bionic
       stage: linux
-      name: debug, g++-7
+      name: g++-7
       addons: { apt: { sources: ["ubuntu-toolchain-r-test"], packages: ["g++-7"] } }
       env: CC=gcc-7 CXX=g++-7
-      script: ./scripts/build_debug.sh
+      script: .ci/build_linux.sh
 
     - os: linux
-      dist: xenial
+      dist: bionic
       stage: linux
-      name: release, g++-7
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test"], packages: ["g++-7"] } }
-      env: CC=gcc-7 CXX=g++-7
-      script: ./scripts/build_release.sh
-
-    #
-    # linux (g++-8)
-    #
-
-    - os: linux
-      dist: xenial
-      stage: linux
-      name: debug, g++-8
+      name: g++-8
       addons: { apt: { sources: ["ubuntu-toolchain-r-test"], packages: ["g++-8"] } }
       env: CC=gcc-8 CXX=g++-8
-      script: ./scripts/build_debug.sh
-
-    - os: linux
-      dist: xenial
-      stage: linux
-      name: release, g++-8
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test"], packages: ["g++-8"] } }
-      env: CC=gcc-8 CXX=g++-8
-      script: ./scripts/build_release.sh
+      script: .ci/build_linux.sh
 
     #
-    # linux (clang++-5.0)
+    # linux (clang++)
     #
 
     - os: linux
-      dist: xenial
+      dist: bionic
       stage: linux
-      name: debug, clang++-5.0
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test"], packages: ["g++-7", "clang-5.0"] } }
+      name: clang++-5.0
+      addons: { apt: { sources: ["ubuntu-toolchain-r-test"], packages: ["clang-5.0"] } }
       env: CC=clang-5.0 CXX=clang++-5.0
-      script: ./scripts/build_debug.sh
+      script: .ci/build_linux.sh
 
     - os: linux
-      dist: xenial
+      dist: bionic
       stage: linux
-      name: release, clang++-5.0
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test"], packages: ["g++-7", "clang-5.0"] } }
-      env: CC=clang-5.0 CXX=clang++-5.0
-      script: ./scripts/build_release.sh
-
-    #
-    # linux (clang++-6.0)
-    #
-
-    - os: linux
-      dist: xenial
-      stage: linux
-      name: debug, clang++-6.0
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test"], packages: ["g++-7", "clang-6.0"] } }
+      name: clang++-6.0
+      addons: { apt: { sources: ["ubuntu-toolchain-r-test"], packages: ["clang-6.0"] } }
       env: CC=clang-6.0 CXX=clang++-6.0
-      script: ./scripts/build_debug.sh
-
-    - os: linux
-      dist: xenial
-      stage: linux
-      name: release, clang++-6.0
-      addons: { apt: { sources: ["ubuntu-toolchain-r-test"], packages: ["g++-7", "clang-6.0"] } }
-      env: CC=clang-6.0 CXX=clang++-6.0
-      script: ./scripts/build_release.sh
+      script: .ci/build_linux.sh
 
     #
-    # macosx (xcode10)
+    # darwin
     #
 
     - os: osx
       osx_image: xcode10
-      stage: macosx
-      name: debug, xcode10
-      script: ./scripts/build_debug.sh
-
-    - os: osx
-      osx_image: xcode10
-      stage: macosx
-      name: release, xcode10
-      script: ./scripts/build_release.sh
-
-    #
-    # macosx (xcode11)
-    #
+      stage: darwin
+      name: xcode10
+      script: .ci/build_darwin.sh
 
     - os: osx
       osx_image: xcode11
-      stage: macosx
-      name: debug, xcode11
-      script: ./scripts/build_debug.sh
-
-    - os: osx
-      osx_image: xcode11
-      stage: macosx
-      name: release, xcode11
-      script: ./scripts/build_release.sh
+      stage: darwin
+      name: xcode11
+      script: .ci/build_darwin.sh
 
     #
     # coverage
@@ -126,6 +70,6 @@ jobs:
     - os: osx
       osx_image: xcode10
       stage: coverage
-      name: coverage, xcode10
+      name: coverage
       addons: { homebrew: { packages: ["lcov"], update: true } }
-      script: ./scripts/upload_coverage.sh
+      script: .ci/build_coverage.sh
diff --git a/LICENSE.md b/LICENSE.md
index d8d62a8..1c580c4 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (C) 2017-2020, by Matvey Cherevko (blackmatov@gmail.com)
+Copyright (C) 2017-2021, by Matvey Cherevko (blackmatov@gmail.com)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/headers/kari.hpp/kari.hpp b/headers/kari.hpp/kari.hpp
index fc7da9f..b163580 100644
--- a/headers/kari.hpp/kari.hpp
+++ b/headers/kari.hpp/kari.hpp
@@ -1,7 +1,7 @@
 /*******************************************************************************
  * This file is part of the "https://github.com/BlackMATov/kari.hpp"
  * For conditions of distribution and use, see copyright notice in LICENSE.md
- * Copyright (C) 2017-2020, by Matvey Cherevko (blackmatov@gmail.com)
+ * Copyright (C) 2017-2021, by Matvey Cherevko (blackmatov@gmail.com)
  ******************************************************************************/
 
 #pragma once
diff --git a/scripts/build_all.bat b/scripts/build_all.bat
deleted file mode 100644
index 9e778dc..0000000
--- a/scripts/build_all.bat
+++ /dev/null
@@ -1,12 +0,0 @@
-@echo off
-set SCRIPT_DIR=%~dp0%
-call %SCRIPT_DIR%\build_debug_x86.bat || goto :error
-call %SCRIPT_DIR%\build_debug_x64.bat || goto :error
-call %SCRIPT_DIR%\build_release_x86.bat || goto :error
-call %SCRIPT_DIR%\build_release_x64.bat || goto :error
-
-goto :EOF
-
-:error
-echo Failed with error #%errorlevel%.
-exit /b %errorlevel%
diff --git a/scripts/build_all.sh b/scripts/build_all.sh
deleted file mode 100755
index d9cd585..0000000
--- a/scripts/build_all.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/bash
-set -e
-SCRIPT_DIR=`dirname "$BASH_SOURCE"`
-$SCRIPT_DIR/build_debug.sh
-$SCRIPT_DIR/build_release.sh
diff --git a/scripts/build_clear.bat b/scripts/build_clear.bat
deleted file mode 100644
index 44375fb..0000000
--- a/scripts/build_clear.bat
+++ /dev/null
@@ -1,9 +0,0 @@
-@echo off
-set BUILD_DIR=%~dp0%\..\build
-rmdir /s /q %BUILD_DIR% || goto :error
-
-goto :EOF
-
-:error
-echo Failed with error #%errorlevel%.
-exit /b %errorlevel%
diff --git a/scripts/build_clear.sh b/scripts/build_clear.sh
deleted file mode 100755
index ef8a2e3..0000000
--- a/scripts/build_clear.sh
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/bash
-set -e
-BUILD_DIR=`dirname "$BASH_SOURCE"`/../build
-rm -rf $BUILD_DIR
diff --git a/scripts/build_debug.sh b/scripts/build_debug.sh
deleted file mode 100755
index a069095..0000000
--- a/scripts/build_debug.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/bin/bash
-set -e
-BUILD_DIR=`dirname "$BASH_SOURCE"`/../build
-mkdir -p $BUILD_DIR/Debug
-pushd $BUILD_DIR/Debug
-cmake -DCMAKE_BUILD_TYPE=Debug ../..
-cmake --build .
-ctest --verbose
-popd
diff --git a/scripts/build_debug_x64.bat b/scripts/build_debug_x64.bat
deleted file mode 100644
index f80c2f3..0000000
--- a/scripts/build_debug_x64.bat
+++ /dev/null
@@ -1,14 +0,0 @@
-@echo off
-set BUILD_DIR=%~dp0%\..\build
-mkdir %BUILD_DIR%\Debug\x64 || goto :error
-pushd %BUILD_DIR%\Debug\x64 || goto :error
-cmake ..\..\.. -A x64 || goto :error
-cmake --build . --config Debug || goto :error
-ctest --verbose || goto :error
-popd || goto :error
-
-goto :EOF
-
-:error
-echo Failed with error #%errorlevel%.
-exit /b %errorlevel%
diff --git a/scripts/build_debug_x86.bat b/scripts/build_debug_x86.bat
deleted file mode 100644
index ee05129..0000000
--- a/scripts/build_debug_x86.bat
+++ /dev/null
@@ -1,14 +0,0 @@
-@echo off
-set BUILD_DIR=%~dp0%\..\build
-mkdir %BUILD_DIR%\Debug\x86 || goto :error
-pushd %BUILD_DIR%\Debug\x86 || goto :error
-cmake ..\..\.. -A Win32 || goto :error
-cmake --build . --config Debug || goto :error
-ctest --verbose || goto :error
-popd || goto :error
-
-goto :EOF
-
-:error
-echo Failed with error #%errorlevel%.
-exit /b %errorlevel%
diff --git a/scripts/build_release.sh b/scripts/build_release.sh
deleted file mode 100755
index 1377504..0000000
--- a/scripts/build_release.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/bin/bash
-set -e
-BUILD_DIR=`dirname "$BASH_SOURCE"`/../build
-mkdir -p $BUILD_DIR/Release
-pushd $BUILD_DIR/Release
-cmake -DCMAKE_BUILD_TYPE=Release ../..
-cmake --build .
-ctest --verbose
-popd
diff --git a/scripts/build_release_x64.bat b/scripts/build_release_x64.bat
deleted file mode 100644
index 65e251e..0000000
--- a/scripts/build_release_x64.bat
+++ /dev/null
@@ -1,14 +0,0 @@
-@echo off
-set BUILD_DIR=%~dp0%\..\build
-mkdir %BUILD_DIR%\Release\x64 || goto :error
-pushd %BUILD_DIR%\Release\x64 || goto :error
-cmake ..\..\.. -A x64 || goto :error
-cmake --build . --config Release || goto :error
-ctest --verbose || goto :error
-popd || goto :error
-
-goto :EOF
-
-:error
-echo Failed with error #%errorlevel%.
-exit /b %errorlevel%
diff --git a/scripts/build_release_x86.bat b/scripts/build_release_x86.bat
deleted file mode 100644
index 1be857b..0000000
--- a/scripts/build_release_x86.bat
+++ /dev/null
@@ -1,14 +0,0 @@
-@echo off
-set BUILD_DIR=%~dp0%\..\build
-mkdir %BUILD_DIR%\Release\x86 || goto :error
-pushd %BUILD_DIR%\Release\x86 || goto :error
-cmake ..\..\.. -A Win32 || goto :error
-cmake --build . --config Release || goto :error
-ctest --verbose || goto :error
-popd || goto :error
-
-goto :EOF
-
-:error
-echo Failed with error #%errorlevel%.
-exit /b %errorlevel%
diff --git a/scripts/upload_coverage.sh b/scripts/upload_coverage.sh
deleted file mode 100755
index d2def85..0000000
--- a/scripts/upload_coverage.sh
+++ /dev/null
@@ -1,17 +0,0 @@
-#!/bin/bash
-set -e
-
-BUILD_DIR=`dirname "$BASH_SOURCE"`/../build
-mkdir -p $BUILD_DIR/coverage
-cd $BUILD_DIR/coverage
-cmake -DCMAKE_BUILD_TYPE=Debug -DBUILD_WITH_COVERAGE=ON ../..
-cmake --build .
-
-lcov -d . -z
-ctest --verbose
-
-lcov -d . -c -o "coverage.info"
-lcov -r "coverage.info" "*/usr/*" "*/untests/*" -o "coverage.info"
-lcov -l "coverage.info"
-
-bash <(curl -s https://codecov.io/bash) -f "coverage.info" || echo "Codecov did not collect coverage reports"
diff --git a/untests/kari_examples.cpp b/untests/kari_examples.cpp
index a8a974d..cc5e9d0 100644
--- a/untests/kari_examples.cpp
+++ b/untests/kari_examples.cpp
@@ -1,7 +1,7 @@
 /*******************************************************************************
  * This file is part of the "https://github.com/BlackMATov/kari.hpp"
  * For conditions of distribution and use, see copyright notice in LICENSE.md
- * Copyright (C) 2017-2020, by Matvey Cherevko (blackmatov@gmail.com)
+ * Copyright (C) 2017-2021, by Matvey Cherevko (blackmatov@gmail.com)
  ******************************************************************************/
 
 #include <kari.hpp/kari.hpp>
diff --git a/untests/kari_ext_tests.cpp b/untests/kari_ext_tests.cpp
index a805fe0..deb2027 100644
--- a/untests/kari_ext_tests.cpp
+++ b/untests/kari_ext_tests.cpp
@@ -1,7 +1,7 @@
 /*******************************************************************************
  * This file is part of the "https://github.com/BlackMATov/kari.hpp"
  * For conditions of distribution and use, see copyright notice in LICENSE.md
- * Copyright (C) 2017-2020, by Matvey Cherevko (blackmatov@gmail.com)
+ * Copyright (C) 2017-2021, by Matvey Cherevko (blackmatov@gmail.com)
  ******************************************************************************/
 
 #include <kari.hpp/kari.hpp>
diff --git a/untests/kari_tests.cpp b/untests/kari_tests.cpp
index f291550..a1d2c0c 100644
--- a/untests/kari_tests.cpp
+++ b/untests/kari_tests.cpp
@@ -1,7 +1,7 @@
 /*******************************************************************************
  * This file is part of the "https://github.com/BlackMATov/kari.hpp"
  * For conditions of distribution and use, see copyright notice in LICENSE.md
- * Copyright (C) 2017-2020, by Matvey Cherevko (blackmatov@gmail.com)
+ * Copyright (C) 2017-2021, by Matvey Cherevko (blackmatov@gmail.com)
  ******************************************************************************/
 
 #include <kari.hpp/kari.hpp>