diff --git a/src/updater.py b/src/updater.py
index a2e47ef98..61eab4e22 100644
--- a/src/updater.py
+++ b/src/updater.py
@@ -22,6 +22,13 @@
 COMMIT_ACTIVITY_PENDING = 'pending'
 COMMIT_ACTIVITY_FAILED = 'failed'
 GITHUB_REPO_STEP_TIMEOUT = 90
+COVERAGE_BADGE_COLOR_THRESHOLDS = (
+    (90, 'brightgreen'),
+    (70, 'green'),
+    (50, 'yellowgreen'),
+    (30, 'yellow'),
+    (10, 'orange'),
+)
 
 
 def update_aur(aur_repos: list):
@@ -86,6 +93,30 @@ def fetch_coverage_trend_for_repo(base_url: str, repo_name: str, headers: dict)
     return coverage_trend_data
 
 
+def _coverage_badge_color(coverage: float) -> str:
+    for minimum, color in COVERAGE_BADGE_COLOR_THRESHOLDS:
+        if coverage >= minimum:
+            return color
+    return 'red'
+
+
+def _get_codecov_coverage(data: dict) -> float:
+    try:
+        return float((data.get('totals') or {}).get('coverage', 0) or 0)
+    except (TypeError, ValueError):
+        return 0.0
+
+
+def _build_codecov_shields_badge(data: dict) -> dict:
+    coverage = _get_codecov_coverage(data)
+    return {
+        'schemaVersion': 1,
+        'label': 'codecov',
+        'message': f'{coverage:g}%',
+        'color': _coverage_badge_color(coverage),
+    }
+
+
 def update_codecov():
     """
     Get code coverage data from Codecov API.
@@ -135,6 +166,9 @@ def update_codecov():
         file_path = os.path.join(BASE_DIR, 'codecov', repo['name'])
         helpers.write_json_files(file_path=file_path, data=data)
 
+        badge_path = os.path.join(BASE_DIR, 'shields', 'codecov', repo['name'])
+        helpers.write_json_files(file_path=badge_path, data=_build_codecov_shields_badge(data))
+
         # Get coverage trend data
         coverage_trend_data = fetch_coverage_trend_for_repo(base_url, repo["name"], headers)
 
diff --git a/tests/unit/test_updater.py b/tests/unit/test_updater.py
index 4ad90beb2..866c3a8be 100644
--- a/tests/unit/test_updater.py
+++ b/tests/unit/test_updater.py
@@ -151,6 +151,39 @@ def fake_get(url, headers, params):
     assert calls == [1, 2]
 
 
+@pytest.mark.parametrize(('coverage', 'color'), [
+    (100, 'brightgreen'),
+    (90, 'brightgreen'),
+    (89.9, 'green'),
+    (70, 'green'),
+    (69.9, 'yellowgreen'),
+    (50, 'yellowgreen'),
+    (49.9, 'yellow'),
+    (30, 'yellow'),
+    (29.9, 'orange'),
+    (10, 'orange'),
+    (9.9, 'red'),
+])
+def test_coverage_badge_color(coverage, color):
+    assert updater._coverage_badge_color(coverage) == color
+
+
+def test_build_codecov_shields_badge():
+    assert updater._build_codecov_shields_badge({'totals': {'coverage': 81.5}}) == {
+        'schemaVersion': 1,
+        'label': 'codecov',
+        'message': '81.5%',
+        'color': 'green',
+    }
+
+    assert updater._build_codecov_shields_badge({'totals': {'coverage': 'bad'}}) == {
+        'schemaVersion': 1,
+        'label': 'codecov',
+        'message': '0%',
+        'color': 'red',
+    }
+
+
 def test_update_codecov_success(monkeypatch, tmp_path):
     base = tmp_path / 'gh-pages'
     repos_file = base / 'github' / 'repos.json'
@@ -176,6 +209,7 @@ def fake_get(url, headers):
 
     assert any('active-repo' in path for path, _ in writes)
     assert not any('archived-repo' in path for path, _ in writes)
+    assert any(path.endswith(('shields\\codecov\\active-repo', 'shields/codecov/active-repo')) for path, _ in writes)
     assert any(path.endswith('active-repo_coverage_trend') for path, _ in writes)