diff --git a/.github/workflows/custom-branch.yml b/.github/workflows/custom-branch.yml
new file mode 100644
index 00000000..ac199374
--- /dev/null
+++ b/.github/workflows/custom-branch.yml
@@ -0,0 +1,74 @@
+name: Run tests on custom libsemigroups branch
+on:
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: "The branch of libsemigroups to clone"
+        required: true
+        type: string
+      fork:
+        description: "The fork of libsemigroups to clone"
+        required: false
+        type: string
+        default: libsemigroups/libsemigroups
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  run-tests:
+    name: "${{ inputs.branch }}, ${{ matrix.os }}"
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest", "macOS-latest"]
+        include:
+          - os: "ubuntu-latest"
+            compiler: "ccache g++"
+          - os: "macOS-latest"
+            compiler: "ccache clang++"
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 15
+    env:
+      CXX: "ccache ${{ matrix.compiler }}"
+      CXXFLAGS: "-O2 -g"
+      UV_NO_SYNC: "1"
+      LD_LIBRARY_PATH: "/usr/local/lib"
+    steps:
+      # Setup environment
+      - uses: actions/checkout@v5
+      - name: Set up Python . . .
+        uses: actions/setup-python@v6
+        with:
+          python-version-file: "pyproject.toml"
+      - name: Install uv and set the Python version
+        uses: astral-sh/setup-uv@v6
+        with:
+          enable-cache: true
+
+      # Build libsemigroups
+      - name: "macOS only: Install libsemigroups dependencies . . ."
+        if: ${{ matrix.os == 'macOS-latest' }}
+        run: brew install autoconf automake libtool
+      - name: "Setup ccache . . ."
+        uses: Chocobo1/setup-ccache-action@v1
+        with:
+          update_packager_index: false
+          install_ccache: true
+      - name: "Install libsemigroups . . ."
+        run: |
+          git clone --depth 1 --branch ${{ inputs.branch }} https://github.com/${{ inputs.fork }}.git
+          cd libsemigroups
+          ./autogen.sh && ./configure CXX="$CXX" CXXFLAGS="$CXXFLAGS" --disable-hpcombi && sudo make install -j8
+          ccache -s
+
+      # Build libsemigroups_pybind11
+      - name: "Install libsemigroups_pybind11 . . ."
+        run: uv sync --locked --all-extras
+
+        # Run the tests and lint
+      - name: "Running tests . . ."
+        run: uv run pytest
+      - name: "Running doc tests . . ."
+        run: uv run make doctest
diff --git a/.github/workflows/test-conda.yml b/.github/workflows/test-conda.yml
new file mode 100644
index 00000000..e8c27e24
--- /dev/null
+++ b/.github/workflows/test-conda.yml
@@ -0,0 +1,65 @@
+name: Run tests (Conda libsemigroups)
+on: [pull_request, workflow_dispatch]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check-doc:
+    name: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+            compiler: g++
+          - os: macOS-latest
+            compiler: clang++
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 15
+    defaults:
+      run:
+        shell: bash -l {0}
+    env:
+      CXX: "ccache ${{ matrix.compiler }}"
+      UV_NO_SYNC: "1"
+    steps:
+      # Setup environment
+      - uses: actions/checkout@v5
+      - name: Create micromamba environment . . .
+        uses: mamba-org/setup-micromamba@v2
+        with:
+          environment-name: libsemigroups
+          cache-environment: true
+          create-args: >-
+            python
+            libsemigroups
+      - name: Install uv . . .
+        uses: astral-sh/setup-uv@v6
+        with:
+          enable-cache: true
+      - name: Setup ccache . . .
+        uses: Chocobo1/setup-ccache-action@v1
+        with:
+          update_packager_index: false
+          install_ccache: true
+      - name: Set environment variables . . .
+        run: |
+          echo "PKG_CONFIG_PATH=$MAMBA_ROOT_PREFIX/envs/libsemigroups/lib/pkgconfig:$MAMBA_ROOT_PREFIX/envs/libsemigroups/share/pkgconfig:/usr/local/lib/pkgconfig" >> $GITHUB_ENV
+          echo "PATH=$MAMBA_ROOT_PREFIX/envs/libsemigroups/bin:$PATH" >> $GITHUB_ENV
+      - name: Check Python version . . .
+        run: python --version
+
+        # Build libsemigroups_pybind11
+      - name: "Install libsemigroups_pybind11 . . ."
+        run: uv sync --locked --all-extras --no-dev --group lint
+
+        # Run the tests and lint
+      - name: "Running tests . . ."
+        run: uv run pytest
+      - name: "Running doc tests . . ."
+        run: |
+          uv run etc/make-doc.sh  # so that all files are generated!
+          cd docs
+          uv run python -m sphinx -b doctest -d _build/doctrees source _build/doctest
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 98d33d14..726fd87d 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -1,4 +1,4 @@
-name: Run tests and lint
+name: Run tests and lint (GitHub libsemigroups)
 on: [pull_request, workflow_dispatch]
 
 concurrency: