diff --git a/binderhub/launcher.py b/binderhub/launcher.py
index 8d7b81fbe..a6f0cd423 100644
--- a/binderhub/launcher.py
+++ b/binderhub/launcher.py
@@ -148,6 +148,17 @@ async def get_user_data(self, username):
         body = json.loads(resp.body.decode("utf-8"))
         return body
 
+    async def get_named_server_count(self, username):
+        """Return the number of named servers for a given JupyterHub user."""
+        try:
+            user_data = await self.get_user_data(username)
+        except RuntimeError:
+            return 0
+        servers = user_data.get("servers", {})
+        if not isinstance(servers, dict):
+            return 0
+        return sum(1 for server_name in servers if server_name != "")
+
     def unique_name_from_repo(self, repo_url):
         """Generate a unique name for a git repo url
 
diff --git a/binderhub/main.py b/binderhub/main.py
index 357e2bef4..570075b79 100644
--- a/binderhub/main.py
+++ b/binderhub/main.py
@@ -23,17 +23,32 @@ def initialize(self):
         return super().initialize()
 
     @authenticated
-    def get(self):
+    async def get(self):
         repoproviders_display_config = [
             repo_provider_class.display_config
             for repo_provider_class in self.settings["repo_providers"].values()
         ]
+        running_environment_count = None
+        launcher = self.settings.get("launcher")
+        if launcher is not None:
+            try:
+                user = self.get_current_user()
+                username = user.get("name") if isinstance(user, dict) else user
+                if username:
+                    running_environment_count = await launcher.get_named_server_count(
+                        username
+                    )
+            except Exception:
+                self.log.debug(
+                    "Unable to determine current environment count", exc_info=True
+                )
         self.page_config |= {
             "baseUrl": self.settings["base_url"],
             "badgeBaseUrl": self.get_badge_base_url(),
             "logoUrl": self.static_url("logo.svg"),
             "logoWidth": "320px",
             "repoProviders": repoproviders_display_config,
+            "runningEnvironmentCount": running_environment_count,
             "aboutMessage": self.settings["about_message"],
             "bannerHtml": self.settings["banner_message"],
             "binderVersion": binder_version,
@@ -58,7 +73,7 @@ def initialize(self, repo_provider):
         return super().initialize()
 
     @authenticated
-    def get(self, provider_id, _escaped_spec):
+    async def get(self, provider_id, _escaped_spec):
         prefix = "/v2/" + provider_id
         spec = self.get_spec_from_request(prefix)
 
@@ -75,7 +90,7 @@ def get(self, provider_id, _escaped_spec):
         self.opengraph_title = (
             f"{self.repo_provider.display_config['displayName']}: {spec}"
         )
-        return super().get()
+        return await super().get()
 
 
 class LegacyRedirectHandler(BaseHandler):
diff --git a/binderhub/static/js/components/LinkGenerator.jsx b/binderhub/static/js/components/LinkGenerator.jsx
index 7492ee08d..439b03587 100644
--- a/binderhub/static/js/components/LinkGenerator.jsx
+++ b/binderhub/static/js/components/LinkGenerator.jsx
@@ -1,5 +1,6 @@
 import { useEffect, useState } from "react";
 import copy from "copy-to-clipboard";
+import { PAGE_CONFIG } from "../App.jsx";
 
 /**
  * @typedef {object} ProviderSelectorProps
@@ -346,6 +347,17 @@ export function LinkGenerator({
           →<a href="https://jdcat.jsps.go.jp/analysis-In-case-of-error.html" target="_blank" rel="noopener noreferrer">問い合わせ先/エラーが発生したときは</a><br/>
           →<a href="https://jdcat.jsps.go.jp/analysis-In-case-of-error.html" target="_blank" rel="noopener noreferrer">Contact Information/Troubleshooting</a>
       </div>
+      {PAGE_CONFIG.runningEnvironmentCount !== undefined &&
+        PAGE_CONFIG.runningEnvironmentCount !== null && (
+        <div style={{ textAlign: "right" }}>
+          <a href="https://jupyter.cs.rcos.nii.ac.jp/" target="_blank" rel="noreferrer" className="fw-semibold">
+            あなたは {PAGE_CONFIG.runningEnvironmentCount}個の解析環境を持っています
+          </a>
+          {PAGE_CONFIG.runningEnvironmentCount >= 10 && (
+            <><br /><span style={{ color: "red" }}>解析環境の数が上限に達しています</span></>
+          )}
+        </div>
+      )}
     </form>
   );
 }
diff --git a/helm-chart/binderhub/Chart.yaml b/helm-chart/binderhub/Chart.yaml
index a6fe67e0c..ba1f13453 100644
--- a/helm-chart/binderhub/Chart.yaml
+++ b/helm-chart/binderhub/Chart.yaml
@@ -1,7 +1,7 @@
 # Chart.yaml v2 reference: https://helm.sh/docs/topics/charts/#the-chartyaml-file
 apiVersion: v2
 name: binderhub
-version: 0.2.5-20260304.3
+version: 0.2.5-20260827
 dependencies:
   # Source code:    https://github.com/jupyterhub/zero-to-jupyterhub-k8s
   # Latest version: https://github.com/jupyterhub/zero-to-jupyterhub-k8s/tags
diff --git a/integration-tests/test_ui.py b/integration-tests/test_ui.py
index 4b0215098..36c5a67d5 100644
--- a/integration-tests/test_ui.py
+++ b/integration-tests/test_ui.py
@@ -35,7 +35,7 @@ async def local_hub_local_binder(request):
     )
 
     url = f"http://127.0.0.1:{port}/services/binder/"
-    for i in range(10):
+    for i in range(30):
         try:
             resp = await async_requests.get(url)
             if resp.status_code == 200: