diff --git a/apps/phystrax/interface.html b/apps/phystrax/interface.html
index 26e68abd6..e665486b6 100644
--- a/apps/phystrax/interface.html
+++ b/apps/phystrax/interface.html
@@ -21,7 +21,22 @@ function saveCSV(data, title) {
       csv += line + "\n";
     }
   }
-  Util.saveCSV(title, csv);
+
+  var blob = new Blob([csv], { type: 'text/csv;charset=utf-8;' });
+  if (navigator.msSaveBlob) { // IE 10+
+    navigator.msSaveBlob(blob, title + ".csv");
+  } else {
+    var link = document.createElement("a");
+    if (link.download !== undefined) {
+      var url = URL.createObjectURL(blob);
+      link.setAttribute("href", url);
+      link.setAttribute("download", title + ".csv");
+      link.style.visibility = 'hidden';
+      document.body.appendChild(link);
+      link.click();
+      document.body.removeChild(link);
+    }
+  }
 }
 
 function downloadHeartRateData() {
@@ -32,7 +47,7 @@ function downloadHeartRateData() {
     if (data) {
       saveCSV(data, "Heart Rate Data");
     } else {
-      domContent.innerHTML = "<b>No heart rate data found</b>";
+      domContent.innerHTML = "<b>No heart rate data found!</b>";
     }
   }, error => {
     console.error("Error reading heart rate data:", error);