diff --git a/resources/content-server/index.html b/resources/content-server/index.html
index cbe3a83d2e..9cba6406a0 100644
--- a/resources/content-server/index.html
+++ b/resources/content-server/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html manifest="calibre.appcache">
+<html>
     <head>
         <title>calibre</title>
         <meta charset="utf-8">
@@ -16,7 +16,7 @@
             <progress>
             </progress>
             <div>Loading, please wait&hellip;</div>
-            <div>You can also use a simple, non-javascript version of this site: <a href="mobile">here</a></div>
+            <div>You can also use a simple, non-JavaScript version of this site: <a href="mobile">here</a></div>
             <style type="text/css">
 #page_load_progress {
     position:relative;
diff --git a/src/calibre/srv/code.py b/src/calibre/srv/code.py
index b87c017931..9c7b2dc487 100644
--- a/src/calibre/srv/code.py
+++ b/src/calibre/srv/code.py
@@ -39,11 +39,6 @@ def index(ctx, rd):
     return lopen(P('content-server/index-generated.html'), 'rb')
 
 
-@endpoint('/calibre.appcache', auth_required=False, cache_control='no-cache')
-def appcache(ctx, rd):
-    return lopen(P('content-server/calibre.appcache'), 'rb')
-
-
 @endpoint('/robots.txt', auth_required=False)
 def robots(ctx, rd):
     return b'User-agent: *\nDisallow: /'
diff --git a/src/calibre/utils/rapydscript.py b/src/calibre/utils/rapydscript.py
index 79c6822862..45150d8904 100644
--- a/src/calibre/utils/rapydscript.py
+++ b/src/calibre/utils/rapydscript.py
@@ -17,9 +17,7 @@ from calibre.constants import (
 )
 from calibre.ptempfile import TemporaryDirectory
 from calibre.utils.filenames import atomic_rename
-from polyglot.builtins import (
-    as_bytes, as_unicode, exec_path, itervalues, unicode_type, zip
-)
+from polyglot.builtins import as_bytes, as_unicode, exec_path, unicode_type, zip
 
 COMPILER_PATH = 'rapydscript/compiler.js.xz'
 special_title = '__webengine_messages_pending__'
@@ -318,20 +316,6 @@ def compile_fast(
     return js.decode('utf-8')
 
 
-def create_manifest(html):
-    import hashlib
-    from calibre.library.field_metadata import category_icon_map
-    h = hashlib.sha256(html)
-    for ci in itervalues(category_icon_map):
-        h.update(I(ci, data=True))
-    icons = {'icon/' + x for x in itervalues(category_icon_map)}
-    icons.add('favicon.png')
-    h.update(I('lt.png', data=True))
-    manifest = '\n'.join(sorted(icons))
-    return 'CACHE MANIFEST\n# {}\n{}\n\nNETWORK:\n*'.format(
-        h.hexdigest(), manifest).encode('utf-8')
-
-
 def base_dir():
     d = os.path.dirname
     return d(d(d(d(os.path.abspath(__file__)))))
@@ -456,9 +440,7 @@ def compile_srv():
     with lopen(os.path.join(base, 'index.html'), 'rb') as f:
         html = f.read().replace(b'RESET_STYLES', reset, 1).replace(b'ICONS', icons, 1).replace(b'MAIN_JS', js, 1)
 
-    manifest = create_manifest(html)
     atomic_write(base, 'index-generated.html', html)
-    atomic_write(base, 'calibre.appcache', manifest)
 
 # }}}
 
diff --git a/src/pyj/autoreload.pyj b/src/pyj/autoreload.pyj
index 6dd3da4951..80ff7025c4 100644
--- a/src/pyj/autoreload.pyj
+++ b/src/pyj/autoreload.pyj
@@ -52,22 +52,8 @@ class Watcher:
                 self.reload_app()
 
     def reload_app(self):
-        appcache = window.top.applicationCache
-        if appcache:
-            for which in 'cached error noupdate obsolete updateready'.split(' '):
-                appcache.addEventListener(which, self.cache_update_done, False)
-        try:
-            appcache.update()
-        except:  # In chrome with devtools open, appcache is sometimes disabled/fails
-            window.location.reload(True)
-
-    def cache_update_done(self):
-        appcache = window.top.applicationCache
-        if appcache and appcache.status is appcache.UPDATEREADY:
-            appcache.swapCache()
         window.location.reload(True)
 
-
 def create_auto_reload_watcher(autoreload_port):
     if not create_auto_reload_watcher.watcher:
         create_auto_reload_watcher.watcher = Watcher(autoreload_port)
diff --git a/src/pyj/book_list/constants.pyj b/src/pyj/book_list/constants.pyj
index da10384f78..ad40262112 100644
--- a/src/pyj/book_list/constants.pyj
+++ b/src/pyj/book_list/constants.pyj
@@ -6,8 +6,3 @@ from __python__ import hash_literals, bound_methods
 book_list_container_id = 'book-list-container'
 read_book_container_id = 'read-book-container'
 INIT_ENDPOINT = 'interface-data/init'
-
-def has_offline_support(val):
-    if val is not undefined:
-        has_offline_support.ans = val
-    return has_offline_support.ans
diff --git a/src/pyj/srv.pyj b/src/pyj/srv.pyj
index 04893d8e08..582d1ceb95 100644
--- a/src/pyj/srv.pyj
+++ b/src/pyj/srv.pyj
@@ -3,18 +3,14 @@
 # globals: ρσ_get_module
 from __python__ import hash_literals
 
-from gettext import gettext as _
-
 import initialize  # noqa: unused-import
 from ajax import ajax, console_print, set_default_timeout
 from autoreload import create_auto_reload_watcher
 from book_list.globals import main_js
 from book_list.main import main
-from book_list.constants import has_offline_support
 
 is_running_in_iframe = False  # Changed before script is loaded in the iframe
 autoreload_enabled = False
-asked_appcache_update = False
 AUTO_UPDATE_THRESHOLD = 1000  # millisecs
 
 if is_running_in_iframe:
@@ -30,31 +26,6 @@ if is_running_in_iframe:
 else:
     start_time = window.performance.now()
 
-    on_appcache_ready = def ():
-        nonlocal asked_appcache_update
-        if asked_appcache_update:
-            return
-        if window.applicationCache.status is window.applicationCache.UPDATEREADY:
-            asked_appcache_update = True
-            try:
-                window.applicationCache.swapCache()
-                time_since_start = window.performance.now() - start_time
-                if time_since_start <= AUTO_UPDATE_THRESHOLD or autoreload_enabled or window.confirm(_(
-                    'The calibre web application has been updated. Do you want reload the site?')):
-                    window.location.reload()
-            except Exception as e:
-                # For some reason swapCache occasionally fails even though status is UPDATEREADY
-                print('WARNING: failed to swap applicationCache')
-                console.log(e)
-
-    if window.applicationCache:
-        window.applicationCache.addEventListener('updateready', on_appcache_ready)
-        if window.applicationCache.status is window.applicationCache.UPDATEREADY:
-            on_appcache_ready()
-        has_offline_support(True)
-    else:
-        has_offline_support(False)
-        console.warn("Your browser does not have a working Application Cache, offline access will not work")
     script = document.currentScript or document.scripts[0]
     main_js(script.textContent)
     script.parentNode.removeChild(script) # save some memory
