diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b035b87c4..40cdf924c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,5 @@
-# general multi-platform CI tests for hledger
+# general multi-platform CI tests
+# build/test/benchmark/haddock on all platforms; disabled in favour of platform-specific workflows
 
 # based on https://gist.github.com/mstksg/11f753d891cee5980326a8ea8c865233
 # docs:
@@ -16,37 +17,37 @@
 # https://sevenzip.osdn.jp/chm/cmdline/commands/index.htm
 
 
-name: hledger CI
+name: multiplatform CI
 
 on:
-  push:
-    branches: [ master ]
-    paths:
-      - 'stack*'
-      - 'hledger-lib'
-      - 'hledger'
-      - 'hledger-ui'
-      - 'hledger-web'
-      - '.github/workflows/*'
-      - '!**.md'
-      - '!**.1'
-      - '!**.5'
-      - '!**.info'
-      - '!**.txt'
-  pull_request:
-    branches: [ master ]
-    paths:
-      - 'stack*'
-      - 'hledger-lib'
-      - 'hledger'
-      - 'hledger-ui'
-      - 'hledger-web'
-      - '.github/workflows/*'
-      - '!**.md'
-      - '!**.1'
-      - '!**.5'
-      - '!**.info'
-      - '!**.txt'
+  # push:
+  #   branches: [ master ]
+  #   paths:
+  #     - 'stack*'
+  #     - 'hledger-lib'
+  #     - 'hledger'
+  #     - 'hledger-ui'
+  #     - 'hledger-web'
+  #     - '.github/workflows/*'
+  #     - '!**.md'
+  #     - '!**.1'
+  #     - '!**.5'
+  #     - '!**.info'
+  #     - '!**.txt'
+  # pull_request:
+  #   branches: [ master ]
+  #   paths:
+  #     - 'stack*'
+  #     - 'hledger-lib'
+  #     - 'hledger'
+  #     - 'hledger-ui'
+  #     - 'hledger-web'
+  #     - '.github/workflows/*'
+  #     - '!**.md'
+  #     - '!**.1'
+  #     - '!**.5'
+  #     - '!**.info'
+  #     - '!**.txt'
   # schedule:
   # - cron: "0 23 * * *"
 
@@ -156,6 +157,10 @@ jobs:
         7z x stack.zip -oC:\Windows stack.exe
         stack --version
 
+    - name: Install GHC
+      run: |
+        stack setup $ARGS
+
     - name: Install haskell deps
       run: |
         stack --install-ghc $ARGS test --bench --only-dependencies
diff --git a/.github/workflows/linux-ci.yml b/.github/workflows/linux-ci.yml
new file mode 100644
index 000000000..c35e2f5a3
--- /dev/null
+++ b/.github/workflows/linux-ci.yml
@@ -0,0 +1,176 @@
+# linux CI tests
+# reasonably thorough build/test/benchmark/haddock/functest testing
+# with stackage lts, run on master push/pull request
+
+# based on https://gist.github.com/mstksg/11f753d891cee5980326a8ea8c865233
+# docs:
+# http://www.btellez.com/posts/triggering-github-actions-with-webhooks.html
+# https://github.com/actions/cache
+# https://github.com/actions/setup-haskell
+# https://github.com/actions/upload-artifact
+# https://github.com/marketplace/actions/cache
+# https://github.com/marketplace/actions/checkout
+# https://github.com/sdras/awesome-actions
+# https://help.github.com/en/actions
+# https://help.github.com/en/actions/configuring-and-managing-workflows/caching-and-storing-workflow-data
+# https://help.github.com/en/actions/configuring-and-managing-workflows/caching-dependencies-to-speed-up-workflows
+# https://help.github.com/en/actions/reference/virtual-environments-for-github-hosted-runners#supported-runners-and-hardware-resources
+# https://sevenzip.osdn.jp/chm/cmdline/commands/index.htm
+
+name: linux CI
+
+on:
+  # schedule:
+  # - cron: "0 23 * * *"
+  push:
+    branches: [ master ]
+    paths:
+      - 'stack*'
+      - 'hledger-lib'
+      - 'hledger'
+      - 'hledger-ui'
+      - 'hledger-web'
+      - '.github/workflows/*'
+      - '!**.md'
+      - '!**.1'
+      - '!**.5'
+      - '!**.info'
+      - '!**.txt'
+  pull_request:
+    branches: [ master ]
+    paths:
+      - 'stack*'
+      - 'hledger-lib'
+      - 'hledger'
+      - 'hledger-ui'
+      - 'hledger-web'
+      - '.github/workflows/*'
+      - '!**.md'
+      - '!**.1'
+      - '!**.5'
+      - '!**.info'
+      - '!**.txt'
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        plan:
+        # - { build: stack, resolver: "--resolver lts-9"  }    # ghc-8.0.2
+        # - { build: stack, resolver: "--resolver lts-11"  }   # ghc-8.2.2
+        # - { build: stack, resolver: "--resolver lts-12"  }   # ghc-8.4.4
+        ## - { build: stack, resolver: "--resolver lts-13"  }  redundant because lts-14 checks ghc-8.6 already
+        # - { build: stack, resolver: "--resolver lts-14"  }   # ghc-8.6.5
+        - { build: stack, resolver: "--resolver lts-15"  }   # ghc-8.8.2
+        # - { build: stack, resolver: "--resolver nightly" }
+        # - { build: stack, resolver: ""                   }
+        # - { build: cabal, ghc: 8.0.2, cabal-install: "2.0"  }   # setup-haskell only supports cabal-install 2.0 and higher
+        # - { build: cabal, ghc: 8.2.2, cabal-install: "2.0"  }
+        # - { build: cabal, ghc: 8.4.4, cabal-install: "2.2"  }
+        # - { build: cabal, ghc: 8.6.5, cabal-install: "2.4"  }
+        # - { build: cabal, ghc: 8.8.1, cabal-install: "2.4"  }   # currently not working for >= 3.0
+        # use this to include any dependencies from OS package managers
+        # include: []
+        # - os: macos-latest
+        #   brew: anybrewdeps
+        # - os: ubuntu-latest
+        #   apt-get: happy libblas-dev liblapack-dev
+        # exclude:
+        # - os: macos-latest
+        #   plan:
+        #     build: cabal
+    runs-on: ${{ matrix.os }}
+
+    steps:
+
+    # cached things
+
+    - name: Cache ~/.stack
+      uses: actions/cache@v1
+      with:
+        path: ~/.stack
+        key: ${{ runner.os }}-stack
+        #key: ${{ runner.os }}-${{ matrix.resolver }}-stack
+
+    - name: Cache ~/.local/bin
+      uses: actions/cache@v1
+      with:
+        path: ~/.local/bin
+        key: ${{ runner.os }}-local-bin
+
+    - name: Cache .stack-work
+      uses: actions/cache@v1
+      with:
+        path: .stack-work
+        key: ${{ runner.os }}-stack-work
+
+    - name: Cache hledger-lib/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger-lib/.stack-work
+        key: ${{ runner.os }}-hledger-lib-stack-work
+
+    - name: Cache hledger/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger/.stack-work
+        key: ${{ runner.os }}-hledger-stack-work
+
+    - name: Cache hledger-ui/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger-ui/.stack-work
+        key: ${{ runner.os }}-hledger-ui-stack-work
+
+    - name: Cache hledger-web/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger-web/.stack-work
+        key: ${{ runner.os }}-hledger-web-stack-work
+
+    # actions
+
+    - name: Check out
+      uses: actions/checkout@v2
+
+    - name: Install stack
+      # curl -L https://get.haskellstack.org/stable/linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C $INSTALLDIR '*/stack'
+      # mkdir -p ~/.local/bin
+      # export PATH=~/.local/bin:$PATH
+      # if [[ ! -x ~/.local/bin/stack ]]; then curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'; chmod a+x ~/.local/bin/stack; fi
+      run: |
+        stack --version
+
+    - name: Install GHC
+      run: |
+        stack $ARGS setup
+      env:
+        ARGS: ${{ matrix.plan.resolver }}
+
+    - name: Install shelltestrunner
+      run: |
+        if [[ ! -x ~/.local/bin/shelltest ]]; then stack $ARGS install shelltestrunner-1.9; fi
+        shelltest --version
+      env:
+        ARGS: ${{ matrix.plan.resolver }}
+
+    - name: Install haskell deps
+      run: |
+        stack $ARGS test --bench --only-dependencies
+        #  --no-terminal
+      env:
+        ARGS: ${{ matrix.plan.resolver }}
+
+    - name: Build/unittest/benchmark/haddock hledger
+      run: |
+        stack $ARGS build --ghc-options=-Werror --test --bench --haddock --no-haddock-deps
+        #  --no-terminal  #  --no-run-benchmarks
+      env:
+        ARGS: ${{ matrix.plan.resolver }}
+
+    - name: Functional tests (excluding addons)
+      run: |
+        COLUMNS=80 stack $ARGS exec -- shelltest --execdir -j16 tests -x /bin -x /addons
+      env:
+        ARGS: ${{ matrix.plan.resolver }}
diff --git a/.github/workflows/mac-ci.yml b/.github/workflows/mac-ci.yml
new file mode 100644
index 000000000..ce627e515
--- /dev/null
+++ b/.github/workflows/mac-ci.yml
@@ -0,0 +1,118 @@
+# mac CI tests
+# basic build testing, run nightly
+
+name: mac CI
+
+on:
+  schedule:
+  - cron: "0 23 * * *"
+  # uncomment when testing CI:
+  push:
+    branches: [ master ]
+    paths:
+      - 'stack*'
+      - 'hledger-lib'
+      - 'hledger'
+      - 'hledger-ui'
+      - 'hledger-web'
+      - '.github/workflows/*'
+      - '!**.md'
+      - '!**.1'
+      - '!**.5'
+      - '!**.info'
+      - '!**.txt'
+  # pull_request:
+  #   branches: [ master ]
+  #   paths:
+  #     - 'stack*'
+  #     - 'hledger-lib'
+  #     - 'hledger'
+  #     - 'hledger-ui'
+  #     - 'hledger-web'
+  #     - '.github/workflows/*'
+  #     - '!**.md'
+  #     - '!**.1'
+  #     - '!**.5'
+  #     - '!**.info'
+  #     - '!**.txt'
+
+jobs:
+  build:
+    runs-on: macos-latest
+    steps:
+
+    # cached things
+
+    - name: Cache ~/.stack
+      uses: actions/cache@v1
+      with:
+        path: ~/.stack
+        key: ${{ runner.os }}-stack
+
+    - name: Cache ~/.local/bin
+      uses: actions/cache@v1
+      with:
+        path: ~/.local/bin
+        key: ${{ runner.os }}-local-bin
+
+    - name: Cache .stack-work
+      uses: actions/cache@v1
+      with:
+        path: .stack-work
+        key: ${{ runner.os }}-stack-work
+
+    - name: Cache hledger-lib/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger-lib/.stack-work
+        key: ${{ runner.os }}-hledger-lib-stack-work
+
+    - name: Cache hledger/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger/.stack-work
+        key: ${{ runner.os }}-hledger-stack-work
+
+    - name: Cache hledger-ui/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger-ui/.stack-work
+        key: ${{ runner.os }}-hledger-ui-stack-work
+
+    - name: Cache hledger-web/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger-web/.stack-work
+        key: ${{ runner.os }}-hledger-web-stack-work
+
+    # actions
+
+    - name: Check out
+      uses: actions/checkout@v2
+
+    - name: Install stack
+      # curl --insecure -L https://get.haskellstack.org/stable/osx-x86_64.tar.gz | tar xz --strip-components=1 --include '*/stack' -C $INSTALLDIR
+      run: |
+        brew install haskell-stack
+        stack --version
+
+    - name: Install GHC
+      run: |
+        stack --resolver=lts setup
+
+    # - name: Install shelltestrunner
+    # - if [[ ! -x ~/.local/bin/shelltest ]]; then stack install shelltestrunner-1.9; fi
+    # - shelltest --version
+
+    - name: Install haskell deps
+      run: |
+        stack --resolver=lts --install-ghc test --bench --only-dependencies
+        #  --no-terminal --bench --install-ghc
+
+    - name: Build hledger
+      run: |
+        stack --resolver=lts test --only-dependencies
+        #  --no-terminal --bench --install-ghc
+
+    # run hledger-lib/hledger functional tests, skipping the ones for addons
+    #- COLUMNS=80 stack exec -- shelltest --execdir -j16 tests -x /bin -x /addons
diff --git a/.github/workflows/windows-ci.yml b/.github/workflows/windows-ci.yml
new file mode 100644
index 000000000..bdd7b2632
--- /dev/null
+++ b/.github/workflows/windows-ci.yml
@@ -0,0 +1,147 @@
+# windows CI tests
+# basic hledger/hledger-web build testing, and binary building, run nightly
+
+name: windows CI
+
+on:
+  schedule:
+  - cron: "0 23 * * *"
+  # uncomment when testing CI:
+  push:
+    branches: [ master ]
+    paths:
+      - 'stack*'
+      - 'hledger-lib'
+      - 'hledger'
+      - 'hledger-ui'
+      - 'hledger-web'
+      - '.github/workflows/*'
+      - '!**.md'
+      - '!**.1'
+      - '!**.5'
+      - '!**.info'
+      - '!**.txt'
+  # pull_request:
+  #   branches: [ master ]
+  #   paths:
+  #     - 'stack*'
+  #     - 'hledger-lib'
+  #     - 'hledger'
+  #     - 'hledger-ui'
+  #     - 'hledger-web'
+  #     - '.github/workflows/*'
+  #     - '!**.md'
+  #     - '!**.1'
+  #     - '!**.5'
+  #     - '!**.info'
+  #     - '!**.txt'
+
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+
+    # cached things
+
+    - name: Cache ~/.stack
+      uses: actions/cache@v1
+      with:
+        path: ~/.stack
+        key: ${{ runner.os }}-stack
+
+    - name: Cache %APPDATA%/.stack
+      uses: actions/cache@v1
+      with:
+        path: %APPDATA%/.stack
+        key: ${{ runner.os }}-stack
+
+    - name: Cache $APPDATA/.stack
+      uses: actions/cache@v1
+      with:
+        path: $APPDATA/.stack
+        key: ${{ runner.os }}-stack
+
+    - name: Cache %APPDATA%/local/bin
+      uses: actions/cache@v1
+      with:
+        path: %APPDATA%/local/bin
+        key: ${{ runner.os }}-local-bin
+
+    - name: Cache $APPDATA/local/bin
+      uses: actions/cache@v1
+      with:
+        path: $APPDATA/local/bin
+        key: ${{ runner.os }}-local-bin
+
+    - name: Cache .stack-work
+      uses: actions/cache@v1
+      with:
+        path: .stack-work
+        key: ${{ runner.os }}-stack-work
+
+    - name: Cache hledger-lib/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger-lib/.stack-work
+        key: ${{ runner.os }}-hledger-lib-stack-work
+
+    - name: Cache hledger/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger/.stack-work
+        key: ${{ runner.os }}-hledger-stack-work
+
+    - name: Cache hledger-ui/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger-ui/.stack-work
+        key: ${{ runner.os }}-hledger-ui-stack-work
+
+    - name: Cache hledger-web/.stack-work
+      uses: actions/cache@v1
+      with:
+        path: hledger-web/.stack-work
+        key: ${{ runner.os }}-hledger-web-stack-work
+
+    # actions
+
+    - name: Check out
+      uses: actions/checkout@v2
+
+    - name: Install stack
+      run: |
+        curl -skL -o stack.zip http://www.stackage.org/stack/windows-x86_64
+        7z x stack.zip -oC:\Windows stack.exe
+        stack --version
+
+    - name: Install GHC
+      run: |
+        stack --resolver=lts setup
+
+    # - name: Install shelltestrunner
+    # - if [[ ! -x ~/.local/bin/shelltest ]]; then stack install shelltestrunner-1.9; fi
+    # - shelltest --version
+
+    - name: Install haskell deps
+      run: |
+        stack --resolver=lts test --only-dependencies
+        #  --no-terminal --bench --install-ghc
+
+    - name: Build hledger
+      run: |
+        stack --resolver=lts install --ghc-options=-Werror --test
+        #  --no-terminal --bench --no-run-benchmarks --haddock --no-haddock-deps
+
+    # run hledger-lib/hledger functional tests, skipping the ones for addons
+    #- COLUMNS=80 stack exec -- shelltest --execdir -j16 tests -x /bin -x /addons
+
+    # - name: Zip exes
+    #   run: |
+    #     #cd `stack path --local-bin`
+    #     7z a hledger.zip %HOME%/.local/bin/hledger %HOME%/.local/bin/hledger-web
+
+    # - name: Upload zip file
+    #   uses: actions/upload-artifact@v1
+    #   with:
+    #     name: hledger.zip
+    #     path: hledger.zip