diff --git a/CHANGELOG.md b/CHANGELOG.md
index a94744803..be52c9af0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to
 
 ## Added
 
+- 🚀(frontend) Adds api caching #961
 - ✨(back) allow theme customnization using a configuration file #948
 - ✨ Add a custom callout block to the editor #892
 - 🚩(frontend) version MIT only #911
diff --git a/src/backend/impress/settings.py b/src/backend/impress/settings.py
index 57269b163..8dcb62530 100755
--- a/src/backend/impress/settings.py
+++ b/src/backend/impress/settings.py
@@ -58,7 +58,14 @@ class Base(Configuration):
     * DB_USER
     """
 
-    DEBUG = False
+    DEBUG_RAW = values.Value(
+        default=False,
+        environ_name="DEBUG",
+        environ_prefix=None,
+    )
+    DEBUG_NAMESPACES = DEBUG_RAW.split(",") if isinstance(DEBUG_RAW, str) else []
+    DEBUG = bool(DEBUG_RAW)
+
     USE_SWAGGER = False
 
     API_VERSION = "v1.0"
@@ -761,6 +768,9 @@ def post_setup(cls):
                 "OIDC_ALLOW_DUPLICATE_EMAILS cannot be set to True simultaneously. "
             )
 
+        if cls.DEBUG and "no-cache" in cls.DEBUG_NAMESPACES:
+            cls.THEME_CUSTOMIZATION_CACHE_TIMEOUT = 0
+
 
 class Build(Base):
     """Settings used when the application is built.
@@ -795,6 +805,17 @@ class Development(Base):
     CSRF_TRUSTED_ORIGINS = ["http://localhost:8072", "http://localhost:3000"]
     DEBUG = True
 
+    # Enable debug namespaces as needed
+    #
+    # DEBUG_NAMESPACES = [
+    #     'no-cache',
+    #     'features:language'
+    # ]
+    #
+    # They can be enabled in all environments
+    # via DEBUG environment variable
+    #   DEBUG="features:language,no-cache,..."
+
     SESSION_COOKIE_NAME = "impress_sessionid"
 
     USE_SWAGGER = True
diff --git a/src/frontend/apps/impress/package.json b/src/frontend/apps/impress/package.json
index d9ecfdece..b7713c200 100644
--- a/src/frontend/apps/impress/package.json
+++ b/src/frontend/apps/impress/package.json
@@ -31,7 +31,9 @@
     "@openfun/cunningham-react": "3.0.0",
     "@react-pdf/renderer": "4.3.0",
     "@sentry/nextjs": "9.15.0",
-    "@tanstack/react-query": "5.75.4",
+    "@tanstack/query-sync-storage-persister": "5.76.0",
+    "@tanstack/react-query": "5.75.5",
+    "@tanstack/react-query-persist-client": "5.76.0",
     "canvg": "4.0.3",
     "clsx": "2.1.1",
     "cmdk": "1.1.1",
diff --git a/src/frontend/apps/impress/src/core/AppProvider.tsx b/src/frontend/apps/impress/src/core/AppProvider.tsx
index 03ce5097d..20eb0d94a 100644
--- a/src/frontend/apps/impress/src/core/AppProvider.tsx
+++ b/src/frontend/apps/impress/src/core/AppProvider.tsx
@@ -1,7 +1,11 @@
 import { CunninghamProvider } from '@openfun/cunningham-react';
-import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { createSyncStoragePersister } from '@tanstack/query-sync-storage-persister';
+import { QueryClient } from '@tanstack/react-query';
+import type { Persister } from '@tanstack/react-query-persist-client';
+import { PersistQueryClientProvider } from '@tanstack/react-query-persist-client';
+import debug from 'debug';
 import { useRouter } from 'next/router';
-import { useEffect } from 'react';
+import { useEffect, useMemo } from 'react';
 
 import { useCunninghamTheme } from '@/cunningham';
 import { Auth, KEY_AUTH, setAuthUrl } from '@/features/auth';
@@ -13,12 +17,16 @@ import { ConfigProvider } from './config/';
  * QueryClient:
  *  - defaultOptions:
  *    - staleTime:
- *      - global cache duration - we decided 3 minutes
- *      - It can be overridden to each query
+ *      - global time until cache is considered stale and will be refetched in the background
+ *        - instant if debug flag "no-cache" active - 3 minutes otherwise
+ *    - gcTime:
+ *      - global time until cache is purged from the persister and needs to be renewed
+ *        - since its cached in localStorage, we can set it to a long time (48h)
  */
 const defaultOptions = {
   queries: {
-    staleTime: 1000 * 60 * 3,
+    staleTime: debug.enabled('no-cache') ? 0 : 1000 * 60 * 3, // 3 minutes
+    gcTime: debug.enabled('no-cache') ? 0 : 1000 * 60 * 60 * 48, // 48 hours
     retry: 1,
   },
 };
@@ -29,11 +37,21 @@ const queryClient = new QueryClient({
 export function AppProvider({ children }: { children: React.ReactNode }) {
   const { theme } = useCunninghamTheme();
   const { replace } = useRouter();
-
   const initializeResizeListener = useResponsiveStore(
     (state) => state.initializeResizeListener,
   );
 
+  const persister = useMemo(() => {
+    // Create persister only when the browser is available
+    if (typeof window !== 'undefined') {
+      return createSyncStoragePersister({
+        storage: window.localStorage,
+      });
+    }
+    // Return undefined otherwise (PersistQueryClientProvider handles undefined persister gracefully)
+    return undefined;
+  }, []);
+
   useEffect(() => {
     return initializeResizeListener();
   }, [initializeResizeListener]);
@@ -60,12 +78,15 @@ export function AppProvider({ children }: { children: React.ReactNode }) {
   }, [replace]);
 
   return (
-    <QueryClientProvider client={queryClient}>
+    <PersistQueryClientProvider
+      client={queryClient}
+      persistOptions={{ persister: persister as Persister }}
+    >
       <CunninghamProvider theme={theme}>
         <ConfigProvider>
           <Auth>{children}</Auth>
         </ConfigProvider>
       </CunninghamProvider>
-    </QueryClientProvider>
+    </PersistQueryClientProvider>
   );
 }
diff --git a/src/frontend/apps/impress/src/core/config/api/useConfig.tsx b/src/frontend/apps/impress/src/core/config/api/useConfig.tsx
index fdfe8c97e..f1e594b2b 100644
--- a/src/frontend/apps/impress/src/core/config/api/useConfig.tsx
+++ b/src/frontend/apps/impress/src/core/config/api/useConfig.tsx
@@ -1,4 +1,5 @@
 import { useQuery } from '@tanstack/react-query';
+import debug from 'debug';
 
 import { APIError, errorCauses, fetchAPI } from '@/api';
 import { Theme } from '@/cunningham/';
@@ -19,45 +20,24 @@ interface ConfigResponse {
   SENTRY_DSN?: string;
 }
 
-const LOCAL_STORAGE_KEY = 'docs_config';
-
-function getCachedTranslation() {
-  try {
-    const jsonString = localStorage.getItem(LOCAL_STORAGE_KEY);
-    return jsonString ? (JSON.parse(jsonString) as ConfigResponse) : undefined;
-  } catch {
-    return undefined;
-  }
-}
-
-function setCachedTranslation(translations: ConfigResponse) {
-  localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(translations));
-}
-
 export const getConfig = async (): Promise<ConfigResponse> => {
   const response = await fetchAPI(`config/`);
 
   if (!response.ok) {
-    throw new APIError('Failed to get the doc', await errorCauses(response));
+    throw new APIError('Failed to get the config', await errorCauses(response));
   }
 
   const config = response.json() as Promise<ConfigResponse>;
-  setCachedTranslation(await config);
 
   return config;
 };
 
-export const KEY_CONFIG = 'config';
+export const QKEY_CONFIG = 'config';
 
 export function useConfig() {
-  const cachedData = getCachedTranslation();
-  const oneHour = 1000 * 60 * 60;
-
   return useQuery<ConfigResponse, APIError, ConfigResponse>({
-    queryKey: [KEY_CONFIG],
+    queryKey: [QKEY_CONFIG],
     queryFn: () => getConfig(),
-    initialData: cachedData,
-    staleTime: oneHour,
-    initialDataUpdatedAt: Date.now() - oneHour, // Force initial data to be considered stale
+    staleTime: debug.enabled('no-cache') ? 0 : 1000 * 60 * 60, // 1 hour
   });
 }
diff --git a/src/frontend/apps/impress/src/features/auth/api/useAuthQuery.tsx b/src/frontend/apps/impress/src/features/auth/api/useAuthQuery.tsx
index 026beec9f..eefb436b3 100644
--- a/src/frontend/apps/impress/src/features/auth/api/useAuthQuery.tsx
+++ b/src/frontend/apps/impress/src/features/auth/api/useAuthQuery.tsx
@@ -1,4 +1,5 @@
 import { UseQueryOptions, useQuery } from '@tanstack/react-query';
+import debug from 'debug';
 
 import { APIError, errorCauses, fetchAPI } from '@/api';
 
@@ -33,7 +34,7 @@ export function useAuthQuery(
   return useQuery<User, APIError, User>({
     queryKey: [KEY_AUTH],
     queryFn: getMe,
-    staleTime: 1000 * 60 * 15, // 15 minutes
+    staleTime: debug.enabled('no-cache') ? 0 : 1000 * 60 * 15, // 15 minutes
     ...queryConfig,
   });
 }
diff --git a/src/frontend/apps/impress/src/pages/_app.tsx b/src/frontend/apps/impress/src/pages/_app.tsx
index 683341c28..37b98bf97 100644
--- a/src/frontend/apps/impress/src/pages/_app.tsx
+++ b/src/frontend/apps/impress/src/pages/_app.tsx
@@ -18,6 +18,28 @@ export default function App({ Component, pageProps }: AppPropsWithLayout) {
   const getLayout = Component.getLayout ?? ((page) => page);
   const { t } = useTranslation();
 
+  if (process.env.NODE_ENV === 'development') {
+    /**
+     *  Enable debug namespaces as needed
+     *
+     *  They can be enabled:
+     *
+     *    via DEBUG environment variable
+     *      DEBUG="features:language,no-cache,..."
+     *
+     *    via browser console
+     *      window.debug = "features:language,no-cache,...";
+     *
+     *    via Local storage
+     *      window.localStorage.debug = "features:language,no-cache,...";
+     *
+     *    via code (uses Local storage)
+     *      import debug from 'debug';
+     *      debug.enable('no-cache,features:language,...');
+     */
+    //debug.enable('no-cache,features:language');
+  }
+
   return (
     <>
       <Head>
diff --git a/src/frontend/yarn.lock b/src/frontend/yarn.lock
index 2cb36297b..1b98bf3b0 100644
--- a/src/frontend/yarn.lock
+++ b/src/frontend/yarn.lock
@@ -4881,16 +4881,36 @@
   dependencies:
     "@typescript-eslint/utils" "^8.18.1"
 
-"@tanstack/query-core@5.75.4":
-  version "5.75.4"
-  resolved "https://registry.yarnpkg.com/@tanstack/query-core/-/query-core-5.75.4.tgz#e05f2fe4145fb5354271ad19e63eec61f6ce3012"
-  integrity sha512-pcqOUgWG9oGlzkfRQQMMsEFmtQu0wq81A414CtELZGq+ztVwSTAaoB3AZRAXQJs88LmNMk2YpUKuQbrvzNDyRg==
+"@tanstack/query-core@5.75.5":
+  version "5.75.5"
+  resolved "https://registry.yarnpkg.com/@tanstack/query-core/-/query-core-5.75.5.tgz#198c27c21b5d15aad09167af8a021f214e194d4b"
+  integrity sha512-kPDOxtoMn2Ycycb76Givx2fi+2pzo98F9ifHL/NFiahEDpDwSVW6o12PRuQ0lQnBOunhRG5etatAhQij91M3MQ==
+
+"@tanstack/query-core@5.76.0":
+  version "5.76.0"
+  resolved "https://registry.yarnpkg.com/@tanstack/query-core/-/query-core-5.76.0.tgz#3b4d5d34ce307ba0cf7d1a3e90d7adcdc6c46be0"
+  integrity sha512-FN375hb8ctzfNAlex5gHI6+WDXTNpe0nbxp/d2YJtnP+IBM6OUm7zcaoCW6T63BawGOYZBbKC0iPvr41TteNVg==
 
 "@tanstack/query-devtools@5.74.7":
   version "5.74.7"
   resolved "https://registry.yarnpkg.com/@tanstack/query-devtools/-/query-devtools-5.74.7.tgz#c9b022b386ac86e6395228b5d6912e6444b3b971"
   integrity sha512-nSNlfuGdnHf4yB0S+BoNYOE1o3oAH093weAYZolIHfS2stulyA/gWfSk/9H4ZFk5mAAHb5vNqAeJOmbdcGPEQw==
 
+"@tanstack/query-persist-client-core@5.76.0":
+  version "5.76.0"
+  resolved "https://registry.yarnpkg.com/@tanstack/query-persist-client-core/-/query-persist-client-core-5.76.0.tgz#a3bcdd687384dc6b5b61b402bef153ad54515321"
+  integrity sha512-xcTZjILf4q49Nsl6wcnhBYZ4O0gpnuNwV6vPIEWIrwTuSNWz2zd/g9bc8SxnXy7xCV8SM1H0IJn8KjLQIUb2ag==
+  dependencies:
+    "@tanstack/query-core" "5.76.0"
+
+"@tanstack/query-sync-storage-persister@5.76.0":
+  version "5.76.0"
+  resolved "https://registry.yarnpkg.com/@tanstack/query-sync-storage-persister/-/query-sync-storage-persister-5.76.0.tgz#29643062f1a424873afb22032ce70ee72436bb9b"
+  integrity sha512-N8d8voY61XkM+jfXTySduLrevD6wRM3pwQ1kG0syLiWWx/sX2+CpaTMSPr0GggjQuhmjhUPo83LaV+e449tizA==
+  dependencies:
+    "@tanstack/query-core" "5.76.0"
+    "@tanstack/query-persist-client-core" "5.76.0"
+
 "@tanstack/react-query-devtools@5.75.4":
   version "5.75.4"
   resolved "https://registry.yarnpkg.com/@tanstack/react-query-devtools/-/react-query-devtools-5.75.4.tgz#89614363d63c997ade81ade4a18e90b57512d4d8"
@@ -4898,12 +4918,19 @@
   dependencies:
     "@tanstack/query-devtools" "5.74.7"
 
-"@tanstack/react-query@5.75.4":
-  version "5.75.4"
-  resolved "https://registry.yarnpkg.com/@tanstack/react-query/-/react-query-5.75.4.tgz#721e1cdf7debb110671f558dc2b6276f637554a5"
-  integrity sha512-Vf65pzYRkf8fk9SP1ncIZjvaXszBhtsvpf+h45Y/9kOywOrVZfBGUpCdffdsVzbmBzmz6TCFes9bM0d3pRrIsA==
+"@tanstack/react-query-persist-client@5.76.0":
+  version "5.76.0"
+  resolved "https://registry.yarnpkg.com/@tanstack/react-query-persist-client/-/react-query-persist-client-5.76.0.tgz#97718fec844708cb98a5902d4b1eeb72adea555b"
+  integrity sha512-QPKgkHX1yC1Ec21FTQHBTbQcHYI+6157DgsmxABp94H7/ZUJ3szZ7wdpdBPQyZ9VxBXlKRN+aNZkOPC90+r/uA==
+  dependencies:
+    "@tanstack/query-persist-client-core" "5.76.0"
+
+"@tanstack/react-query@5.75.5":
+  version "5.75.5"
+  resolved "https://registry.yarnpkg.com/@tanstack/react-query/-/react-query-5.75.5.tgz#650a6b58c7bcd4c33062426e05c4467571148a4f"
+  integrity sha512-QrLCJe40BgBVlWdAdf2ZEVJ0cISOuEy/HKupId1aTKU6gPJZVhSvZpH+Si7csRflCJphzlQ77Yx6gUxGW9o0XQ==
   dependencies:
-    "@tanstack/query-core" "5.75.4"
+    "@tanstack/query-core" "5.75.5"
 
 "@tanstack/react-table@8.20.6":
   version "8.20.6"