diff --git a/frontend/src/app/api/login/route.ts b/frontend/src/app/api/login/route.ts
index 55ddbab..e7ea7a4 100644
--- a/frontend/src/app/api/login/route.ts
+++ b/frontend/src/app/api/login/route.ts
@@ -1,7 +1,7 @@
 import { cookies as cookiesPromise } from "next/headers";
 import { redirect } from "next/navigation";
 
-import { USOS_APPS_URL } from "@/env.mjs";
+import { env } from "@/env.mjs";
 import { getRequestToken } from "@/lib/auth";
 
 export const dynamic = "force-dynamic";
@@ -39,6 +39,6 @@ export async function GET() {
   });
 
   return redirect(
-    `${USOS_APPS_URL}/services/oauth/authorize?oauth_token=${token.token}`,
+    `${env.USOS_APPS_URL}/services/oauth/authorize?oauth_token=${token.token}`,
   );
 }
diff --git a/frontend/src/app/plans/edit/[id]/_components/SyncErrorAlert.tsx b/frontend/src/app/plans/edit/[id]/_components/SyncErrorAlert.tsx
index 1cc757b..beb2320 100644
--- a/frontend/src/app/plans/edit/[id]/_components/SyncErrorAlert.tsx
+++ b/frontend/src/app/plans/edit/[id]/_components/SyncErrorAlert.tsx
@@ -39,13 +39,11 @@ interface PlanResponseType {
 export const SyncErrorAlert = ({
   onlinePlan,
   planDate,
-  bounce = false,
   downloadChanges,
   sendChanges,
 }: {
   onlinePlan: PlanResponseType | null | undefined;
   planDate: Date;
-  bounce?: boolean;
   downloadChanges: () => void;
   sendChanges: () => void;
 }) => {
@@ -74,7 +72,6 @@ export const SyncErrorAlert = ({
     <div
       className={cn(
         "flex w-full flex-col rounded-md bg-primary/10 transition-all",
-        { "animate-fast-bounce": bounce },
       )}
     >
       <div className="flex w-full items-start justify-start p-4 pb-2">
diff --git a/frontend/src/app/plans/edit/[id]/_components/SyncedButton.tsx b/frontend/src/app/plans/edit/[id]/_components/SyncedButton.tsx
index d079dbb..4dfaa7c 100644
--- a/frontend/src/app/plans/edit/[id]/_components/SyncedButton.tsx
+++ b/frontend/src/app/plans/edit/[id]/_components/SyncedButton.tsx
@@ -8,6 +8,7 @@ import {
   RefreshCwOffIcon,
 } from "lucide-react";
 import React, { useMemo } from "react";
+import { toast } from "sonner";
 
 import { Button } from "@/components/ui/button";
 import {
@@ -15,36 +16,33 @@ import {
   TooltipContent,
   TooltipTrigger,
 } from "@/components/ui/tooltip";
+import type { PlanState } from "@/lib/usePlan";
 
 export const SyncedButton = ({
-  synced,
-  onlineId,
-  syncing,
+  plan,
+  isSyncing,
   onClick,
-  bounceAlert,
-  equalsDates,
+  isEqualsDates,
   isOffline,
 }: {
-  synced: boolean;
-  onlineId: string | null;
-  syncing: boolean;
+  plan: PlanState;
+  isSyncing: boolean;
   onClick: () => Promise<void>;
-  bounceAlert: () => void;
-  equalsDates: boolean;
+  isEqualsDates: boolean;
   isOffline: boolean;
 }) => {
   const message = useMemo(() => {
-    if (synced && equalsDates) {
+    if (plan.synced && isEqualsDates) {
       return "Zsynchronizowano";
-    } else if (!(onlineId ?? "")) {
+    } else if (!(plan.onlineId ?? "")) {
       return "Plan dostępny tylko lokalnie";
-    } else if (syncing) {
+    } else if (isSyncing) {
       return "Synchronizowanie...";
-    } else if (!equalsDates) {
+    } else if (!isEqualsDates) {
       return "Twoja wersja różni się od wersji online";
     }
     return "Masz lokalne zmiany";
-  }, [synced, onlineId, syncing, equalsDates]);
+  }, [plan.synced, plan.onlineId, isSyncing, isEqualsDates]);
   return (
     <Tooltip>
       <TooltipTrigger asChild={true}>
@@ -53,8 +51,11 @@ export const SyncedButton = ({
           variant="outline"
           className="min-w-10"
           onClick={() => {
-            if (!equalsDates) {
-              bounceAlert();
+            if (!isEqualsDates) {
+              toast.info(
+                "Wybierz akcję z alertu powyżej, aby zsynchronizować dane tak jak chcesz",
+                { duration: 5000 },
+              );
             } else if (isOffline) {
               return;
             } else {
@@ -62,13 +63,13 @@ export const SyncedButton = ({
             }
           }}
         >
-          {synced && equalsDates ? (
+          {plan.synced && isEqualsDates ? (
             <CloudIcon className="size-4 text-emerald-500" />
-          ) : !(onlineId ?? "") ? (
+          ) : !(plan.onlineId ?? "") ? (
             <AlertTriangleIcon className="size-4 text-rose-500" />
-          ) : syncing ? (
+          ) : isSyncing ? (
             <RefreshCwIcon className="size-4 animate-spin text-primary" />
-          ) : !equalsDates ? (
+          ) : !isEqualsDates ? (
             <GitPullRequestClosed className="size-4 text-primary" />
           ) : (
             <RefreshCwOffIcon className="size-4 text-amber-500" />
diff --git a/frontend/src/app/plans/edit/[id]/page.client.tsx b/frontend/src/app/plans/edit/[id]/page.client.tsx
index d27d71e..cb25396 100644
--- a/frontend/src/app/plans/edit/[id]/page.client.tsx
+++ b/frontend/src/app/plans/edit/[id]/page.client.tsx
@@ -27,6 +27,7 @@ import {
   SelectValue,
 } from "@/components/ui/select";
 import { Skeleton } from "@/components/ui/skeleton";
+import { env } from "@/env.mjs";
 import { usePlan } from "@/lib/usePlan";
 import { registrationReplacer } from "@/lib/utils";
 import { createOnlinePlan } from "@/lib/utils/createOnlinePlan";
@@ -49,7 +50,6 @@ export function CreateNewPlanPage({
 }) {
   const [syncing, setSyncing] = useState(false);
   const [offlineAlert, setOfflineAlert] = useState(false);
-  const [bouncingAlert, setBouncingAlert] = useState(false);
   const [faculty, setFaculty] = useState<string | null>(null);
 
   const firstTime = useRef(true);
@@ -64,7 +64,7 @@ export function CreateNewPlanPage({
     queryKey: ["registrations", faculty],
     queryFn: async () => {
       const response = await fetch(
-        `${process.env.NEXT_PUBLIC_API_URL}/departments/${faculty}/registrations`,
+        `${env.NEXT_PUBLIC_API_URL}/departments/${faculty}/registrations`,
       );
 
       if (!response.ok) {
@@ -101,7 +101,7 @@ export function CreateNewPlanPage({
     mutationKey: ["courses"],
     mutationFn: async (registrationId: string) => {
       const response = await fetch(
-        `${process.env.NEXT_PUBLIC_API_URL}/departments/${faculty}/registrations/${encodeURIComponent(registrationId)}/courses`,
+        `${env.NEXT_PUBLIC_API_URL}/departments/${faculty}/registrations/${encodeURIComponent(registrationId)}/courses`,
       );
 
       if (!response.ok) {
@@ -176,13 +176,6 @@ export function CreateNewPlanPage({
     }
   };
 
-  const bounceAlert = () => {
-    setBouncingAlert(true);
-    setTimeout(() => {
-      setBouncingAlert(false);
-    }, 1000);
-  };
-
   const resetInactivityTimer = () => {
     if (inactivityTimeout.current !== null) {
       clearTimeout(inactivityTimeout.current);
@@ -248,7 +241,6 @@ export function CreateNewPlanPage({
           }}
           planDate={plan.updatedAt}
           onlinePlan={onlinePlan}
-          bounce={bouncingAlert}
         />
 
         <div className="flex flex-col justify-start gap-3 md:w-full">
@@ -292,13 +284,11 @@ export function CreateNewPlanPage({
               </form>
             </div>
             <SyncedButton
-              synced={plan.synced}
-              onlineId={plan.onlineId}
-              syncing={syncing}
-              bounceAlert={bounceAlert}
+              plan={plan}
+              isSyncing={syncing}
               onClick={handleSyncPlan}
               isOffline={offlineAlert}
-              equalsDates={isEqual(
+              isEqualsDates={isEqual(
                 plan.updatedAt,
                 new Date(onlinePlan ? onlinePlan.updatedAt : plan.updatedAt),
               )}
diff --git a/frontend/src/app/plans/edit/[id]/page.tsx b/frontend/src/app/plans/edit/[id]/page.tsx
index 38e38b3..f3dedbb 100644
--- a/frontend/src/app/plans/edit/[id]/page.tsx
+++ b/frontend/src/app/plans/edit/[id]/page.tsx
@@ -2,6 +2,8 @@ import type { Metadata } from "next";
 import { notFound } from "next/navigation";
 import React from "react";
 
+import { env } from "@/env.mjs";
+
 import { CreateNewPlanPage } from "./page.client";
 
 interface PageProps {
@@ -19,7 +21,7 @@ export default async function CreateNewPlan({ params }: PageProps) {
   }
 
   const facultiesRes = (await fetch(
-    `${process.env.NEXT_PUBLIC_API_URL}/departments`,
+    `${env.NEXT_PUBLIC_API_URL}/departments`,
   ).then((r) => r.json())) as Array<{ id: string; name: string }> | null;
   if (!facultiesRes) {
     return notFound();
diff --git a/frontend/src/env.mjs b/frontend/src/env.mjs
index 4f34a27..8fcf279 100644
--- a/frontend/src/env.mjs
+++ b/frontend/src/env.mjs
@@ -5,7 +5,7 @@ export const env = createEnv({
   server: {
     USOS_CONSUMER_KEY: z.string().min(1),
     USOS_CONSUMER_SECRET: z.string().min(1),
-    USOS_BASE_URL: z.string().startsWith("usos").default("usos.pwr.edu.pl"),
+    USOS_APPS_URL: z.string().url().default("https://apps.usos.pwr.edu.pl"),
     SITE_URL: z.string().url().default("http://localhost:3000"),
     NEXT_PUBLIC_API_URL: z.string().url().default("http://localhost:3000/api"),
   },
@@ -15,11 +15,9 @@ export const env = createEnv({
   runtimeEnv: {
     SITE_URL: process.env.SITE_URL,
     NEXT_PUBLIC_API_URL: process.env.NEXT_PUBLIC_API_URL,
-    USOS_BASE_URL: process.env.USOS_BASE_URL,
+    USOS_APPS_URL: process.env.USOS_APPS_URL,
     USOS_CONSUMER_KEY: process.env.USOS_CONSUMER_KEY,
     USOS_CONSUMER_SECRET: process.env.USOS_CONSUMER_SECRET,
   },
   skipValidation: process.env.SKIP_ENV_VALIDATION === "true",
 });
-
-export const USOS_APPS_URL = `https://apps.${env.USOS_BASE_URL}`;
diff --git a/frontend/src/lib/auth/index.ts b/frontend/src/lib/auth/index.ts
index ec58215..3ca88c3 100644
--- a/frontend/src/lib/auth/index.ts
+++ b/frontend/src/lib/auth/index.ts
@@ -24,7 +24,7 @@ export const getAccessToken = async (
 ) => {
   const data = oauth.authorize(
     {
-      url: `https://apps.${env.USOS_BASE_URL}/services/oauth/access_token`,
+      url: `${env.USOS_APPS_URL}/services/oauth/access_token`,
       method: "POST",
       data: { oauth_token, oauth_verifier },
     },
@@ -35,8 +35,8 @@ export const getAccessToken = async (
   );
 
   const response = await fetch(
-    `https://apps.${
-      env.USOS_BASE_URL
+    `${
+      env.USOS_APPS_URL
     }/services/oauth/access_token?${new URLSearchParams(Object.entries(data)).toString()}
 		`,
     {
@@ -62,7 +62,7 @@ const removeMultipleSlashesFromUrl = (url: string) => {
 
 export async function getRequestToken() {
   const data = oauth.authorize({
-    url: `https://apps.${env.USOS_BASE_URL}/services/oauth/request_token`,
+    url: `${env.USOS_APPS_URL}/services/oauth/request_token`,
     method: "POST",
     data: {
       oauth_callback: removeMultipleSlashesFromUrl(
@@ -73,9 +73,7 @@ export async function getRequestToken() {
   });
 
   const response = await fetch(
-    `https://apps.${
-      env.USOS_BASE_URL
-    }/services/oauth/request_token?${new URLSearchParams(
+    `${env.USOS_APPS_URL}/services/oauth/request_token?${new URLSearchParams(
       Object.entries(data),
     ).toString()}`,
     {
diff --git a/frontend/src/services/usos/usosClient.ts b/frontend/src/services/usos/usosClient.ts
index 4aff515..218b28e 100644
--- a/frontend/src/services/usos/usosClient.ts
+++ b/frontend/src/services/usos/usosClient.ts
@@ -1,9 +1,9 @@
 import fetch from "node-fetch";
 
-import { USOS_APPS_URL } from "@/env.mjs";
+import { env } from "@/env.mjs";
 import { oauth } from "@/lib/auth";
 
-const baseUrl = `${USOS_APPS_URL}/services`;
+const baseUrl = `${env.USOS_APPS_URL}/services`;
 
 export const createClient = ({
   token,