diff --git a/bin/web/js/main.js b/bin/web/js/main.js
index b3f09cc..413d4a1 100644
--- a/bin/web/js/main.js
+++ b/bin/web/js/main.js
@@ -37,6 +37,7 @@ import {
     downloadFile,
     hashFromString,
 	clone,
+    isMobile,
 } from './utils.js';
 
 import {
@@ -171,6 +172,9 @@ const findInjectPanel = () => {
 };
 
 window.onload = () => {
+    if (isMobile()) {
+        alert('Variable Time is a tool currently designed to be used on desktop.');
+    }
     window.addEventListener('panelEvent', (e) => {
         clearTimeout(window.panelFinderTimeout);
         let target = false;
diff --git a/bin/web/js/utils.js b/bin/web/js/utils.js
index fb54ae8..4896b28 100644
--- a/bin/web/js/utils.js
+++ b/bin/web/js/utils.js
@@ -386,6 +386,15 @@ const mapValue = (value, low1, high1, low2, high2, clamp=false) => {
     return clamp ? Math.min(high2 > low2 ? high2 : low2, Math.max(low2 < high2 ? low2 : high2, mapped)) : mapped;
 }
 
+const isMobile = () => {
+    if (/Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)) {
+        return true;
+    } else if (navigator.maxTouchPoints && navigator.maxTouchPoints > 2 && /MacIntel/.test(navigator.platform)) {
+        return true;
+    }
+    return false;
+};
+
 /////////////////////////////////////
 
 export {