diff --git a/frontend/index.html b/frontend/index.html
index e483d12..6e4d003 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -5,7 +5,7 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>SIMtrace Analyser</title>
 <link rel="manifest" href="manifest.json">
-<link rel="icon" type="image/svg+xml" href="sim-analyser.svg">
+<link rel="icon" type="image/svg+xml" href="sim-analyser.svg" id="favicon-svg">
 <link rel="icon" type="image/png" href="favicon.png">
 <meta name="theme-color" content="#0f172a">
 <style>
@@ -2009,6 +2009,9 @@ function applyTheme(theme) {
     document.getElementById('theme-btn').textContent = theme === 'dark' ? '☀️' : '🌙';
     document.querySelector('meta[name="theme-color"]').setAttribute(
         'content', theme === 'dark' ? '#0f172a' : '#fafafa');
+    const fav = document.getElementById('favicon-svg');
+    if (fav) fav.setAttribute('href',
+        theme === 'dark' ? 'sim-analyser.svg' : 'sim-analyser-light.svg');
 }
 
 function toggleTheme() {
diff --git a/frontend/sim-analyser-light.svg b/frontend/sim-analyser-light.svg
new file mode 100644
index 0000000..3835db1
--- /dev/null
+++ b/frontend/sim-analyser-light.svg
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   shape-rendering="geometricPrecision"
+   text-rendering="geometricPrecision"
+   image-rendering="optimizeQuality"
+   fill-rule="evenodd"
+   clip-rule="evenodd"
+   viewBox="0 0 507 511.73"
+   version="1.1"
+   id="svg1"
+   sodipodi:docname="sim-analyser.svg"
+   inkscape:version="1.4.4 (dcaf3e7d9e, 2026-05-05)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1" />
+  <sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#3b82f6"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:zoom="1.0446382"
+     inkscape:cx="206.29151"
+     inkscape:cy="241.23184"
+     inkscape:window-width="1707"
+     inkscape:window-height="1007"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg1" />
+  <path
+     d="M224.639 0c59.668 0 116.663 23.625 158.855 65.816 58.277 58.264 79.952 144.187 56.478 223.076-5.44 18.308-13.169 35.634-22.82 51.652l87.013 94.825c4.008 4.376 3.736 11.192-.627 15.2l-63.894 58.345c-4.362 4.008-11.15 3.694-15.145-.668l-83.237-91.553c-35.253 21.471-75.345 32.676-116.623 32.676-59.681 0-116.678-23.624-158.869-65.816a224.953 224.953 0 01-48.762-72.959C-17.808 226.73 1.985 129.628 65.798 65.843 107.907 23.611 165.012 0 224.639 0zM351.39 97.92C186.06-67.451-70.51 183.202 97.833 351.436c51.257 51.134 128.646 66.579 195.362 38.974 67.083-27.864 110.692-93.107 110.692-165.739 0-24.32-4.812-47.508-13.523-68.542A180.032 180.032 0 00351.39 97.92z"
+     fill="#2563eb" id="path1" />
+  <path
+     style="fill:#2563eb;stroke-width:4.8596"
+     d="m 128.04356,356.87391 c -13.07564,-2.62909 -24.733,-12.68507 -29.511929,-25.45795 -2.596909,-6.94081 -2.6389,-8.86274 -2.29299,-104.97903 l 0.35231,-97.90875 3.788399,-6.8388 c 4.61261,-8.3267 10.50929,-13.68042 19.93961,-18.10361 l 7.13036,-3.34441 h 97.07534 97.0753 l 7.13037,3.34441 c 9.43036,4.42319 15.32699,9.77691 19.93961,18.10361 l 3.78839,6.8388 0.35231,97.90875 c 0.34602,96.11629 0.30373,98.03822 -2.29294,104.97903 -3.50512,9.36825 -10.87912,17.4984 -20.10814,22.17001 l -7.52385,3.80852 -95.14666,0.19674 c -52.33067,0.10843 -97.19362,-0.2148 -99.69555,-0.71758 z m 46.33625,-48.98143 v -28.28685 h -28.28682 -28.28687 v 22.40224 22.40224 l 3.47213,4.12639 c 5.66491,6.73236 9.07721,7.53679 32.20788,7.59246 l 20.89368,0.0505 z m 78.43168,0.0486 v -28.23905 l -28.28799,-0.36934 -28.288,-0.36933 0.001,28.60829 0.001,28.60828 h 28.28682 28.28683 z m 67.88799,26.4325 c 1.90962,-0.99356 4.91852,-3.35297 6.68645,-5.24315 3.14502,-3.3625 3.22311,-3.93424 3.61699,-26.48038 l 0.40286,-23.04367 -24.5107,-0.16089 c -13.48091,-0.0884 -25.3786,-0.16089 -26.43935,-0.16089 -6.0649,0 -5.78596,-1.37936 -5.78596,28.60828 v 28.28683 h 21.27901 c 15.77042,0 22.17779,-0.46749 24.75093,-1.80651 z M 331.24322,228.81866 V 199.88895 H 255.9675 180.69175 l -3.15598,-3.15595 -3.15596,-3.15602 v -36.05986 -36.05988 h -20.61354 c -22.40511,0 -26.44906,0.88289 -32.10286,7.0087 l -3.21436,3.4828 -0.35671,62.89983 -0.3567,62.89984 h 106.7539 106.75388 z m -78.43173,-78.43245 v -28.92976 h -28.28683 -28.28682 v 28.07258 c 0,15.43993 0.38586,28.45827 0.85719,28.92974 0.47138,0.4714 13.20053,0.85713 28.28682,0.85713 h 27.42964 z m 78.43173,6.61896 c 0,-21.05484 -0.16425,-22.55671 -2.91862,-26.67962 -5.20034,-7.78442 -9.192,-8.86481 -32.76137,-8.86705 l -20.89371,-0.002 v 28.07259 c 0,15.43993 0.38585,28.45827 0.85718,28.92974 0.47138,0.47139 13.20053,0.85712 28.28683,0.85712 h 27.42969 z"
+     id="path1-5"
+     sodipodi:nodetypes="csscsscccsscccsccccccccccscccccccccccccscccsscsccccccccccssccccccccccscsccscccscscs" />
+</svg>
diff --git a/frontend/sw.js b/frontend/sw.js
index 13255da..009df1a 100644
--- a/frontend/sw.js
+++ b/frontend/sw.js
@@ -1,4 +1,4 @@
-const CACHE = 'simtrace-analyser-v12';
+const CACHE = 'simtrace-analyser-v13';
 
 const PRECACHE = [
     'index.html',
@@ -7,6 +7,7 @@ const PRECACHE = [
     'icon-512.png',
     'favicon.png',
     'sim-analyser.svg',
+    'sim-analyser-light.svg',
 ];
 
 self.addEventListener('install', e => {