diff --git a/relay/application.py b/relay/application.py
index cd8f89a..aba9bc7 100644
--- a/relay/application.py
+++ b/relay/application.py
@@ -44,7 +44,8 @@ def get_csp(request: web.Request) -> str:
 		"connect-src 'self'",
 		"img-src 'self'",
 		"object-src 'none'",
-		"frame-ancestors 'none'"
+		"frame-ancestors 'none'",
+		f"manifest-src 'self' https://{request.app.config.domain}"
 	]
 
 	return '; '.join(data) + ';'
diff --git a/relay/frontend/base.haml b/relay/frontend/base.haml
index d58c98b..7b366ab 100644
--- a/relay/frontend/base.haml
+++ b/relay/frontend/base.haml
@@ -13,6 +13,7 @@
 		%meta(name="viewport" content="width=device-width, initial-scale=1")
 		%link(rel="stylesheet" type="text/css" href="/theme/{{config.theme}}.css" nonce="{{view.request['hash']}}" class="theme")
 		%link(rel="stylesheet" type="text/css" href="/static/style.css" nonce="{{view.request['hash']}}")
+		%link(rel="manifest" href="/manifest.json")
 		%script(type="application/javascript" src="/static/api.js" nonce="{{view.request['hash']}}", defer)
 		-block head
 
diff --git a/relay/misc.py b/relay/misc.py
index 5af6e60..ae18b2d 100644
--- a/relay/misc.py
+++ b/relay/misc.py
@@ -38,7 +38,8 @@ MIMETYPES = {
 	'css': 'text/css',
 	'html': 'text/html',
 	'json': 'application/json',
-	'text': 'text/plain'
+	'text': 'text/plain',
+	'webmanifest': 'application/manifest+json'
 }
 
 NODEINFO_NS = {
diff --git a/relay/views/frontend.py b/relay/views/frontend.py
index ae1043a..4aed045 100644
--- a/relay/views/frontend.py
+++ b/relay/views/frontend.py
@@ -210,11 +210,27 @@ class AdminConfig(View):
 		return Response.new(data, ctype = 'html')
 
 
-@register_route('/style.css')
-class StyleCss(View):
+@register_route('/manifest.json')
+class ManifestJson(View):
 	async def get(self, request: Request) -> Response:
-		data = self.template.render('style.css', self)
-		return Response.new(data, ctype = 'css')
+		with self.database.session(False) as conn:
+			config = conn.get_config_all()
+			theme = THEMES[config.theme]
+
+		data = {
+			'background_color': theme['background'],
+			'categories': ['activitypub'],
+			'description': 'Message relay for the ActivityPub network',
+			'display': 'standalone',
+			'name': config['name'],
+			'orientation': 'portrait',
+			'scope': f"https://{self.config.domain}/",
+			'short_name': 'ActivityRelay',
+			'start_url': f"https://{self.config.domain}/",
+			'theme_color': theme['primary']
+		}
+
+		return Response.new(data, ctype = 'webmanifest')
 
 
 @register_route('/theme/{theme}.css')