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Mobile DevTools

Name: Kernel DevTools
Author: Kernel DevTools

Inspect any page on your phone — console, network, and storage — with no local server and no install. Start with Option A (proxy, instant, works on any device). Option B (bookmarklet) is a fallback for the rare site that blocks framing, and works best on desktop.

Proxy InspectorInstant

Open this page on your phone browser — kerneltools.dev/mobile

Tap "Open Proxy Inspector →" below

Type any URL in the bar that appears (e.g. example.com) and tap Go

The page loads in a frame. Tap the 🔬 DevTools button beside Go to open Console / Network / Storage

If a site blocks iframes (keeps redirecting), use Option B instead.

Bookmarklet InspectorDesktop-friendly

Reliable on desktop. On Android Chrome specifically, tapping a saved javascript: bookmarklet often doesn't run at all — a browser-level restriction, not something this site controls. If it doesn't work for you, Option A above covers the same ground for almost every site.

Step 1 — Add the bookmarklet (do this on desktop)

🔬 Kernel DevTools← Drag to your bookmarks bar

Can't drag? Add it manually on mobile

Copy the bookmarklet code first:

javascript:(function(){function openPanel(){var w=window.open('https://kerneltools.dev/mobile?mode=popup&sid=iwfa4nar&url='+encodeURIComponent(location.href),'kdev','width=430,height=700');if(!w){alert('Kernel DevTools: the popup was blocked. Please allow pop-ups for this site, then tap the bookmarklet again.');}return w;}if(window.__kdevLoaded){if(window.__kdevPanel&&!window.__kdevPanel.closed){window.__kdevPanel.focus();}else{window.__kdevPanel=openPanel();}return;}window.__kdevLoaded=true;window.__kdevPanel=openPanel();var s=document.createElement('script');s.src='https://kerneltools.dev/agent.js';s.dataset.kdevMode='bookmarklet';s.dataset.kdevSid='iwfa4nar';document.head.appendChild(s);})();

Chrome (Android)

Bookmark any page — tap ⋮ → Star

Open Bookmarks → find it → long-press → Edit

Replace the URL field with the copied code → Save

Safari (iPhone)

Bookmark any page — Share → Add Bookmark

Open Bookmarks → find it → Edit

Replace the URL with the copied code → Done

Step 2 — Use it on any page

Navigate to any page you want to inspect on your phone

Android Chrome: tap the address bar, start typing Kernel DevTools, then tap it in the suggestions — not the Bookmarks menu. On desktop or other browsers, just click it on your bookmarks bar.

A DevTools popup opens showing Console, Network, and Storage in real time. (Opening it from the Bookmarks menu instead of the address bar is the #1 reason it silently does nothing on Android Chrome — that menu opens as its own page with no memory of what you were just looking at, so there's no page left to inspect.)

Tap it again on the same page to re-focus the popup if you closed it. If nothing opens and Chrome shows a small "Popup blocked" bar, tap Always show for this site

Your session ID (fixed for this bookmarklet):

iwfa4nar

To also stream data into the Kernel Extension on desktop: open Ctrl+Shift+Y → 📱 Mobile tab → enter this session ID.

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Which option to pick? Start with Option A — it works instantly with no setup. Switch to Option B if the site uses a frame-buster (the page keeps redirecting instead of loading), since the bookmarklet injects directly into the page without any iframe.