diff --git a/muxplex/service.py b/muxplex/service.py
index 5c8b469..fbeae15 100644
--- a/muxplex/service.py
+++ b/muxplex/service.py
@@ -33,6 +33,35 @@ Environment=PATH={safe_path}
 WantedBy=default.target
 """
 
+_LAUNCHD_PLIST_TEMPLATE = """\
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>Label</key>
+    <string>com.muxplex</string>
+    <key>ProgramArguments</key>
+    <array>
+        <string>{muxplex_bin}</string>
+        <string>serve</string>
+    </array>
+    <key>EnvironmentVariables</key>
+    <dict>
+        <key>PATH</key>
+        <string>{safe_path}</string>
+    </dict>
+    <key>RunAtLoad</key>
+    <true/>
+    <key>KeepAlive</key>
+    <true/>
+    <key>StandardOutPath</key>
+    <string>/tmp/muxplex.log</string>
+    <key>StandardErrorPath</key>
+    <string>/tmp/muxplex.err</string>
+</dict>
+</plist>
+"""
+
 # ---------------------------------------------------------------------------
 # Platform detection
 # ---------------------------------------------------------------------------
@@ -122,36 +151,56 @@ def _systemd_logs() -> None:
 
 
 # ---------------------------------------------------------------------------
-# Private stubs — launchd (macOS)
+# Private implementations — launchd (macOS)
 # ---------------------------------------------------------------------------
 
 
 def _launchd_install() -> None:
-    raise NotImplementedError("launchd install not implemented")
+    muxplex_bin = _resolve_muxplex_bin()
+    base_path = os.environ.get("PATH", "/usr/bin:/bin")
+    safe_path = f"/opt/homebrew/bin:/usr/local/bin:{base_path}"
+    plist_content = _LAUNCHD_PLIST_TEMPLATE.format(
+        muxplex_bin=muxplex_bin, safe_path=safe_path
+    )
+    _LAUNCHD_PLIST_DIR.mkdir(parents=True, exist_ok=True)
+    _LAUNCHD_PLIST_PATH.write_text(plist_content)
+    uid = os.getuid()
+    subprocess.run(
+        ["launchctl", "bootstrap", f"gui/{uid}", str(_LAUNCHD_PLIST_PATH)], check=True
+    )
+    _prompt_host_if_localhost()
 
 
 def _launchd_uninstall() -> None:
-    raise NotImplementedError("launchd uninstall not implemented")
+    uid = os.getuid()
+    subprocess.run(["launchctl", "bootout", f"gui/{uid}/{_LAUNCHD_LABEL}"], check=True)
+    _LAUNCHD_PLIST_PATH.unlink(missing_ok=True)
 
 
 def _launchd_start() -> None:
-    raise NotImplementedError("launchd start not implemented")
+    uid = os.getuid()
+    subprocess.run(
+        ["launchctl", "bootstrap", f"gui/{uid}", str(_LAUNCHD_PLIST_PATH)], check=True
+    )
 
 
 def _launchd_stop() -> None:
-    raise NotImplementedError("launchd stop not implemented")
+    uid = os.getuid()
+    subprocess.run(["launchctl", "bootout", f"gui/{uid}/{_LAUNCHD_LABEL}"], check=True)
 
 
 def _launchd_restart() -> None:
-    raise NotImplementedError("launchd restart not implemented")
+    _launchd_stop()
+    _launchd_start()
 
 
 def _launchd_status() -> None:
-    raise NotImplementedError("launchd status not implemented")
+    uid = os.getuid()
+    subprocess.run(["launchctl", "print", f"gui/{uid}/{_LAUNCHD_LABEL}"], check=True)
 
 
 def _launchd_logs() -> None:
-    raise NotImplementedError("launchd logs not implemented")
+    subprocess.run(["tail", "-f", "/tmp/muxplex.log"], check=True)
 
 
 # ---------------------------------------------------------------------------
diff --git a/muxplex/tests/test_service.py b/muxplex/tests/test_service.py
index 2af6d8e..44f36c5 100644
--- a/muxplex/tests/test_service.py
+++ b/muxplex/tests/test_service.py
@@ -148,3 +148,120 @@ def test_systemd_logs_calls_journalctl(monkeypatch):
     monkeypatch.setattr(subprocess, "run", lambda cmd, **kw: calls.append(list(cmd)))
     svc._systemd_logs()
     assert ["journalctl", "--user", "-u", "muxplex", "-f"] in calls
+
+
+# ---------------------------------------------------------------------------
+# launchd tests
+# ---------------------------------------------------------------------------
+
+
+def test_launchd_install_writes_plist_and_bootstraps(monkeypatch, tmp_path):
+    """_launchd_install writes plist with 'com.muxplex' and 'serve' (no --host/--port)
+    and calls launchctl bootstrap with gui/{uid}."""
+    import os
+
+    import muxplex.service as svc
+
+    plist_dir = tmp_path / "LaunchAgents"
+    plist_path = plist_dir / "com.muxplex.plist"
+
+    monkeypatch.setattr(svc, "_LAUNCHD_PLIST_DIR", plist_dir)
+    monkeypatch.setattr(svc, "_LAUNCHD_PLIST_PATH", plist_path)
+    monkeypatch.setattr(os, "getuid", lambda: 501)
+
+    calls = []
+    monkeypatch.setattr(subprocess, "run", lambda cmd, **kw: calls.append(list(cmd)))
+
+    # Suppress interactive prompt
+    monkeypatch.setattr(svc, "_prompt_host_if_localhost", lambda: None)
+
+    svc._launchd_install()
+
+    # Plist file must exist and contain expected content
+    assert plist_path.exists(), "plist file was not written"
+    content = plist_path.read_text()
+    assert "com.muxplex" in content, "plist must contain 'com.muxplex'"
+    assert "serve" in content, "plist ProgramArguments must include 'serve'"
+    assert "--host" not in content, "plist must NOT contain --host"
+    assert "--port" not in content, "plist must NOT contain --port"
+
+    # bootstrap must be called with gui/501
+    bootstrap_calls = [c for c in calls if "bootstrap" in c]
+    assert bootstrap_calls, "launchctl bootstrap not called"
+    bootstrap_cmd = bootstrap_calls[0]
+    assert "gui/501" in bootstrap_cmd, (
+        f"bootstrap must use gui/501, got: {bootstrap_cmd}"
+    )
+
+
+def test_launchd_uninstall_bootouts_and_removes(monkeypatch, tmp_path):
+    """_launchd_uninstall calls launchctl bootout and removes the plist file."""
+    import os
+
+    import muxplex.service as svc
+
+    plist_dir = tmp_path / "LaunchAgents"
+    plist_dir.mkdir(parents=True)
+    plist_path = plist_dir / "com.muxplex.plist"
+    plist_path.write_text("<plist/>")
+
+    monkeypatch.setattr(svc, "_LAUNCHD_PLIST_DIR", plist_dir)
+    monkeypatch.setattr(svc, "_LAUNCHD_PLIST_PATH", plist_path)
+    monkeypatch.setattr(os, "getuid", lambda: 501)
+
+    calls = []
+    monkeypatch.setattr(subprocess, "run", lambda cmd, **kw: calls.append(list(cmd)))
+
+    svc._launchd_uninstall()
+
+    # bootout must be called
+    bootout_calls = [c for c in calls if "bootout" in c]
+    assert bootout_calls, "launchctl bootout not called"
+    bootout_cmd = bootout_calls[0]
+    assert "gui/501" in " ".join(bootout_cmd), (
+        f"bootout must reference gui/501, got: {bootout_cmd}"
+    )
+    assert "com.muxplex" in " ".join(bootout_cmd), (
+        f"bootout must reference com.muxplex, got: {bootout_cmd}"
+    )
+
+    # plist must be removed
+    assert not plist_path.exists(), "plist file was not deleted"
+
+
+def test_launchd_stop_calls_bootout(monkeypatch):
+    """_launchd_stop runs launchctl bootout gui/{uid}/com.muxplex."""
+    import os
+
+    import muxplex.service as svc
+
+    monkeypatch.setattr(os, "getuid", lambda: 501)
+
+    calls = []
+    monkeypatch.setattr(subprocess, "run", lambda cmd, **kw: calls.append(list(cmd)))
+
+    svc._launchd_stop()
+
+    bootout_calls = [c for c in calls if "bootout" in c]
+    assert bootout_calls, "launchctl bootout not called"
+    bootout_cmd = bootout_calls[0]
+    assert "gui/501" in " ".join(bootout_cmd), (
+        f"bootout must reference gui/501, got: {bootout_cmd}"
+    )
+    assert "com.muxplex" in " ".join(bootout_cmd), (
+        f"bootout must reference com.muxplex, got: {bootout_cmd}"
+    )
+
+
+def test_launchd_logs_tails_log_file(monkeypatch):
+    """_launchd_logs runs exactly ['tail', '-f', '/tmp/muxplex.log']."""
+    import muxplex.service as svc
+
+    calls = []
+    monkeypatch.setattr(subprocess, "run", lambda cmd, **kw: calls.append(list(cmd)))
+
+    svc._launchd_logs()
+
+    assert ["tail", "-f", "/tmp/muxplex.log"] in calls, (
+        f"Expected ['tail', '-f', '/tmp/muxplex.log'], got: {calls}"
+    )