diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 77f19949d..f0ea8623b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,6 +19,10 @@ jobs:
       run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
     - name: Prepare
       run: cp -R /orig/${{matrix.version}} orig
+    - name: Download objdiff CLI
+      if: github.ref == 'refs/heads/main'
+      run: |
+        python tools/download_tool.py --tag v2.0.0-alpha.5 objdiff-cli objdiff-cli
     - name: Build
       run: |
         python configure.py --version ${{matrix.version}} --compilers /compilers --warn error
@@ -33,3 +37,13 @@ jobs:
       run: |
         python tools/upload_progress.py -b https://progress.decomp.club/ -p tww -v ${{matrix.version}} \
           build/${{matrix.version}}/progress.json
+    - name: Generate objdiff progress report
+      if: github.ref == 'refs/heads/main'
+      run: |
+        ./objdiff-cli report generate -o report.json
+    - name: Save objdiff progress report artifact
+      if: github.ref == 'refs/heads/main'
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{ matrix.version }}-report-${{ github.sha }}
+        path: report.json
diff --git a/tools/download_tool.py b/tools/download_tool.py
index 7b386a4ba..7bba7b164 100755
--- a/tools/download_tool.py
+++ b/tools/download_tool.py
@@ -66,12 +66,29 @@ def wibo_url(tag: str) -> str:
     return f"{repo}/releases/download/{tag}/wibo"
 
 
+def objdiffcli_url(tag: str) -> str:
+    uname = platform.uname()
+    suffix = ""
+    system = uname.system.lower()
+    if system == "darwin":
+        system = "macos"
+    elif system == "windows":
+        suffix = ".exe"
+    arch = uname.machine.lower()
+    if arch == "amd64":
+        arch = "x86_64"
+
+    repo = "https://github.com/encounter/objdiff"
+    return f"{repo}/releases/download/{tag}/objdiff-cli-{system}-{arch}{suffix}"
+
+
 TOOLS: Dict[str, Callable[[str], str]] = {
     "binutils": binutils_url,
     "compilers": compilers_url,
     "dtk": dtk_url,
     "sjiswrap": sjiswrap_url,
     "wibo": wibo_url,
+    "objdiff-cli": objdiffcli_url,
 }