diff --git a/.gitignore b/.gitignore
index 7ce4267..8be8a4b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 __pycache__
 venv
 capport.yaml
+custom
diff --git a/src/capport/api/__init__.py b/src/capport/api/__init__.py
index 8a018e1..e69de29 100644
--- a/src/capport/api/__init__.py
+++ b/src/capport/api/__init__.py
@@ -1,172 +0,0 @@
-from __future__ import annotations
-
-import ipaddress
-import logging
-import typing
-import uuid
-
-import capport.database
-import capport.comm.hub
-import capport.comm.message
-import capport.utils.cli
-import capport.utils.ipneigh
-import quart
-import quart_trio
-import trio
-from capport import cptypes
-from capport.config import Config
-
-
-app = quart_trio.QuartTrio(__name__)
-_logger = logging.getLogger(__name__)
-
-
-config: typing.Optional[Config] = None
-hub: typing.Optional[capport.comm.hub.Hub] = None
-hub_app: typing.Optional[ApiHubApp] = None
-nc: typing.Optional[capport.utils.ipneigh.NeighborController] = None
-
-
-def get_client_ip() -> cptypes.IPAddress:
-    try:
-        addr = ipaddress.ip_address(quart.request.remote_addr)
-    except ValueError as e:
-        _logger.warning(f'Invalid client address {quart.request.remote_addr!r}: {e}')
-        quart.abort(500, 'Invalid client address')
-    if addr.is_loopback:
-        forw_addr_headers = quart.request.headers.getlist('X-Forwarded-For')
-        if len(forw_addr_headers) == 1:
-            try:
-                return ipaddress.ip_address(forw_addr_headers[0])
-            except ValueError as e:
-                _logger.warning(f'Invalid forwarded client address {forw_addr_headers!r} (from {addr}): {e}')
-                quart.abort(500, 'Invalid client address')
-        elif forw_addr_headers:
-            _logger.warning(f'Multiple forwarded client addresses {forw_addr_headers!r} (from {addr})')
-            quart.abort(500, 'Invalid client address')
-    return addr
-
-
-async def get_client_mac_if_present(address: typing.Optional[cptypes.IPAddress]=None) -> typing.Optional[cptypes.MacAddress]:
-    assert nc  # for mypy
-    if not address:
-        address = get_client_ip()
-    return await nc.get_neighbor_mac(address)
-
-
-async def get_client_mac(address: typing.Optional[cptypes.IPAddress]=None) -> cptypes.MacAddress:
-    mac = await get_client_mac_if_present(address)
-    if mac is None:
-        _logger.warning(f"Couldn't find MAC addresss for {address}")
-        quart.abort(404, 'Unknown client')
-    return mac
-
-
-class ApiHubApp(capport.comm.hub.HubApplication):
-    async def mac_states_changed(self, *, from_peer_id: uuid.UUID, pending_updates: capport.database.PendingUpdates) -> None:
-        # TODO: support websocket notification updates to clients?
-        pass
-
-
-async def user_login(address: cptypes.IPAddress, mac: cptypes.MacAddress) -> None:
-    assert config  # for mypy
-    assert hub  # for mypy
-    pu = capport.database.PendingUpdates()
-    try:
-        hub.database.login(mac, config.session_timeout, pending_updates=pu)
-    except capport.database.NotReadyYet as e:
-        quart.abort(500, str(e))
-
-    if pu.macs:
-        _logger.info(f'User {mac} (with IP {address}) logged in')
-        for msg in pu.serialize():
-            await hub.broadcast(msg)
-
-
-async def user_logout(mac: cptypes.MacAddress) -> None:
-    assert hub  # for mypy
-    pu = capport.database.PendingUpdates()
-    try:
-        hub.database.logout(mac, pending_updates=pu)
-    except capport.database.NotReadyYet as e:
-        quart.abort(500, str(e))
-    if pu.macs:
-        _logger.info(f'User {mac} logged out')
-        for msg in pu.serialize():
-            await hub.broadcast(msg)
-
-
-async def user_lookup() -> cptypes.MacPublicState:
-    assert hub  # for mypy
-    address = get_client_ip()
-    mac = await get_client_mac_if_present(address)
-    if not mac:
-        return cptypes.MacPublicState.from_missing_mac(address)
-    else:
-        return hub.database.lookup(address, mac)
-
-
-async def _run_hub(*, task_status=trio.TASK_STATUS_IGNORED) -> None:
-    global hub
-    global hub_app
-    global nc
-    assert config  # for mypy
-    try:
-        async with capport.utils.ipneigh.connect() as mync:
-            nc = mync
-            _logger.info("Running hub for API")
-            myapp = ApiHubApp()
-            myhub = capport.comm.hub.Hub(config=config, app=myapp)
-            hub = myhub
-            hub_app = myapp
-            await myhub.run(task_status=task_status)
-    finally:
-        hub = None
-        hub_app = None
-        nc = None
-        _logger.info("Done running hub for API")
-        await app.shutdown()
-
-
-@app.before_serving
-async def init():
-    global config
-    config = Config.load_default_once()
-    app.secret_key = config.cookie_secret
-    capport.utils.cli.init_logger(config)
-    await app.nursery.start(_run_hub)
-
-
-# @app.route('/all')
-# async def route_all():
-#     return hub_app.database.as_json()
-
-
-@app.route('/', methods=['GET'])
-async def index():
-    state = await user_lookup()
-    return await quart.render_template('index.html', state=state)
-
-
-@app.route('/login', methods=['POST'])
-async def login():
-    address = get_client_ip()
-    mac = await get_client_mac(address)
-    await user_login(address, mac)
-    await quart.flash('Logged in')
-    return quart.redirect('/', code=303)
-
-
-@app.route('/logout', methods=['POST'])
-async def logout():
-    mac = await get_client_mac()
-    await user_logout(mac)
-    await quart.flash('Logged out')
-    return quart.redirect('/', code=303)
-
-
-@app.route('/api/captive-portal', methods=['GET'])
-# RFC 8908: https://datatracker.ietf.org/doc/html/rfc8908
-async def captive_api():
-    state = await user_lookup()
-    return state.to_rfc8908(config)
diff --git a/src/capport/api/app.py b/src/capport/api/app.py
new file mode 100644
index 0000000..b9e144e
--- /dev/null
+++ b/src/capport/api/app.py
@@ -0,0 +1,8 @@
+from .app_cls import MyQuartApp
+
+
+app = MyQuartApp(__name__)
+
+
+__import__('capport.api.setup')
+__import__('capport.api.views')
diff --git a/src/capport/api/app_cls.py b/src/capport/api/app_cls.py
new file mode 100644
index 0000000..5f9087d
--- /dev/null
+++ b/src/capport/api/app_cls.py
@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+import os
+import os.path
+import typing
+
+import capport.comm.hub
+import capport.config
+import capport.utils.ipneigh
+import jinja2
+import quart.templating
+import quart_trio
+
+
+class DispatchingJinjaLoader(quart.templating.DispatchingJinjaLoader):
+    app: MyQuartApp
+
+    def __init__(self, app: MyQuartApp) -> None:
+        super().__init__(app)
+
+    def _loaders(self) -> typing.Generator[jinja2.BaseLoader, None, None]:
+        if self.app.custom_loader:
+            yield self.app.custom_loader
+        for loader in super()._loaders():
+            yield loader
+
+
+class MyQuartApp(quart_trio.QuartTrio):
+    my_nc: typing.Optional[capport.utils.ipneigh.NeighborController] = None
+    my_hub: typing.Optional[capport.comm.hub.Hub] = None
+    my_config: capport.config.Config
+    custom_loader: typing.Optional[jinja2.FileSystemLoader] = None
+
+    def __init__(self, import_name: str, **kwargs) -> None:
+        self.my_config = capport.config.Config.load_default_once()
+        kwargs.setdefault('template_folder', os.path.join(os.path.dirname(__file__), 'templates'))
+        cust_templ = os.path.join('custom', 'templates')
+        if os.path.exists(cust_templ):
+            self.custom_loader = jinja2.FileSystemLoader(os.fspath(cust_templ))
+        super().__init__(import_name, **kwargs)
+        self.debug = self.my_config.debug
+        self.secret_key = self.my_config.cookie_secret
+
+    def create_global_jinja_loader(self) -> DispatchingJinjaLoader:
+        """Create and return a global (not blueprint specific) Jinja loader."""
+        return DispatchingJinjaLoader(self)
diff --git a/src/capport/api/setup.py b/src/capport/api/setup.py
new file mode 100644
index 0000000..7437e1a
--- /dev/null
+++ b/src/capport/api/setup.py
@@ -0,0 +1,46 @@
+from __future__ import annotations
+
+import logging
+import uuid
+
+import capport.database
+import capport.comm.hub
+import capport.comm.message
+import capport.utils.cli
+import capport.utils.ipneigh
+import trio
+
+from .app import app
+
+
+_logger = logging.getLogger(__name__)
+
+
+class ApiHubApp(capport.comm.hub.HubApplication):
+    async def mac_states_changed(self, *, from_peer_id: uuid.UUID, pending_updates: capport.database.PendingUpdates) -> None:
+        # TODO: support websocket notification updates to clients?
+        pass
+
+
+async def _run_hub(*, task_status=trio.TASK_STATUS_IGNORED) -> None:
+    try:
+        async with capport.utils.ipneigh.connect() as mync:
+            app.my_nc = mync
+            _logger.info("Running hub for API")
+            myapp = ApiHubApp()
+            myhub = capport.comm.hub.Hub(config=app.my_config, app=myapp)
+            app.my_hub = myhub
+            await myhub.run(task_status=task_status)
+    finally:
+        app.my_hub = None
+        app.my_nc = None
+        _logger.info("Done running hub for API")
+        await app.shutdown()
+
+
+@app.before_serving
+async def init():
+    app.debug = app.my_config.debug
+    app.secret_key = app.my_config.cookie_secret
+    capport.utils.cli.init_logger(app.my_config)
+    await app.nursery.start(_run_hub)
diff --git a/src/capport/api/templates/base.html b/src/capport/api/templates/base.html
index 88b314c..a0b0b67 100644
--- a/src/capport/api/templates/base.html
+++ b/src/capport/api/templates/base.html
@@ -2,7 +2,7 @@
 <html>
     <head>
         <meta charset="utf-8" />
-        <title>{% block title %}Captive Portal Universität Stuttgart{% endblock %}</title>
+        <title>{% block title %}Captive Portal{% endblock %}</title>
         <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     </head>
     <body>
diff --git a/src/capport/api/views.py b/src/capport/api/views.py
new file mode 100644
index 0000000..97786c9
--- /dev/null
+++ b/src/capport/api/views.py
@@ -0,0 +1,125 @@
+from __future__ import annotations
+
+import ipaddress
+import logging
+import typing
+
+import capport.database
+import capport.comm.hub
+import capport.comm.message
+import capport.utils.cli
+import capport.utils.ipneigh
+import quart
+from capport import cptypes
+
+from .app import app
+
+
+_logger = logging.getLogger(__name__)
+
+
+def get_client_ip() -> cptypes.IPAddress:
+    try:
+        addr = ipaddress.ip_address(quart.request.remote_addr)
+    except ValueError as e:
+        _logger.warning(f'Invalid client address {quart.request.remote_addr!r}: {e}')
+        quart.abort(500, 'Invalid client address')
+    if addr.is_loopback:
+        forw_addr_headers = quart.request.headers.getlist('X-Forwarded-For')
+        if len(forw_addr_headers) == 1:
+            try:
+                return ipaddress.ip_address(forw_addr_headers[0])
+            except ValueError as e:
+                _logger.warning(f'Invalid forwarded client address {forw_addr_headers!r} (from {addr}): {e}')
+                quart.abort(500, 'Invalid client address')
+        elif forw_addr_headers:
+            _logger.warning(f'Multiple forwarded client addresses {forw_addr_headers!r} (from {addr})')
+            quart.abort(500, 'Invalid client address')
+    return addr
+
+
+async def get_client_mac_if_present(address: typing.Optional[cptypes.IPAddress]=None) -> typing.Optional[cptypes.MacAddress]:
+    assert app.my_nc  # for mypy
+    if not address:
+        address = get_client_ip()
+    return await app.my_nc.get_neighbor_mac(address)
+
+
+async def get_client_mac(address: typing.Optional[cptypes.IPAddress]=None) -> cptypes.MacAddress:
+    mac = await get_client_mac_if_present(address)
+    if mac is None:
+        _logger.warning(f"Couldn't find MAC addresss for {address}")
+        quart.abort(404, 'Unknown client')
+    return mac
+
+
+async def user_login(address: cptypes.IPAddress, mac: cptypes.MacAddress) -> None:
+    assert app.my_hub  # for mypy
+    pu = capport.database.PendingUpdates()
+    try:
+        app.my_hub.database.login(mac, app.my_config.session_timeout, pending_updates=pu)
+    except capport.database.NotReadyYet as e:
+        quart.abort(500, str(e))
+
+    if pu.macs:
+        _logger.info(f'User {mac} (with IP {address}) logged in')
+        for msg in pu.serialize():
+            await app.my_hub.broadcast(msg)
+
+
+async def user_logout(mac: cptypes.MacAddress) -> None:
+    assert app.my_hub  # for mypy
+    pu = capport.database.PendingUpdates()
+    try:
+        app.my_hub.database.logout(mac, pending_updates=pu)
+    except capport.database.NotReadyYet as e:
+        quart.abort(500, str(e))
+    if pu.macs:
+        _logger.info(f'User {mac} logged out')
+        for msg in pu.serialize():
+            await app.my_hub.broadcast(msg)
+
+
+async def user_lookup() -> cptypes.MacPublicState:
+    assert app.my_hub  # for mypy
+    address = get_client_ip()
+    mac = await get_client_mac_if_present(address)
+    if not mac:
+        return cptypes.MacPublicState.from_missing_mac(address)
+    else:
+        return app.my_hub.database.lookup(address, mac)
+
+
+# @app.route('/all')
+# async def route_all():
+#     return app.my_hub.database.as_json()
+
+
+@app.route('/', methods=['GET'])
+async def index():
+    state = await user_lookup()
+    return await quart.render_template('index.html', state=state)
+
+
+@app.route('/login', methods=['POST'])
+async def login():
+    address = get_client_ip()
+    mac = await get_client_mac(address)
+    await user_login(address, mac)
+    await quart.flash('Logged in')
+    return quart.redirect('/', code=303)
+
+
+@app.route('/logout', methods=['POST'])
+async def logout():
+    mac = await get_client_mac()
+    await user_logout(mac)
+    await quart.flash('Logged out')
+    return quart.redirect('/', code=303)
+
+
+@app.route('/api/captive-portal', methods=['GET'])
+# RFC 8908: https://datatracker.ietf.org/doc/html/rfc8908
+async def captive_api():
+    state = await user_lookup()
+    return state.to_rfc8908(app.my_config)
diff --git a/start-api.sh b/start-api.sh
index 1d9d365..5bb91de 100755
--- a/start-api.sh
+++ b/start-api.sh
@@ -5,4 +5,4 @@ set -e
 base=$(dirname "$(readlink -f "$0")")
 cd "${base}"
 
-exec ./venv/bin/hypercorn --config python:capport.api.hypercorn_conf capport.api "$@"
+exec ./venv/bin/hypercorn --config python:capport.api.hypercorn_conf capport.api.app "$@"