Mobile Dev Browser

The Grainbox Company

In-app purchases

About this app

Mobile Dev Browser puts a real developer console in your pocket. It's a Chromium-based browser with built-in, on-device developer tools — so you can inspect and debug websites on an actual phone, on the go, without tethering to a desktop.

One-time payment required to unlock some functionality:
- Copying logs,
- Sharing logs.
Viewing logs is free. The payment supports my time on this app.

Open any site and watch its JavaScript console stream live: log, info, warning, and error messages captured as the page runs. Put the page and the console side by side in a resizable split view, filter by level, search the output, and keep logs across navigations to follow a whole multi-step flow. Tap any entry for full detail and stack traces — then search the error on the web or copy it as a ready-made AI prompt to paste into your assistant.

ON-DEVICE DEVELOPER TOOLS — NO LAPTOP REQUIRED
• Live console capture — console.log / info / warn / error, as the page runs
• Element inspector — long-press anything to see its tag, id, classes and DOM path; copy any of them, or copy the whole element as an AI prompt
• Network panel — per-request sizes and timings for the current page
• View source — the page's full HTML, line-numbered, with a wrap toggle
• Find in page, desktop-site mode, and password autofill support

BUILT FOR DEVELOPERS
• A smart address bar that treats localhost, 127.0.0.1 and private LAN IPs as URLs over http — and never sends your internal addresses to a search engine
• URL autocomplete from your history, your favourites, and live search suggestions
• Tabs with quick switching, plus reopen-closed-tab and clone-tab
• Pull-to-refresh, an auto-hiding toolbar, and your choice of search engine
• Long-press a link for open-in-new-tab, copy, and share
• One-tap "clear site data" and a clean, modern interface with full dark mode

WHO IT'S FOR
• Web and mobile developers debugging on real devices
• QA and support engineers reproducing issues in the field
• Anyone who needs to see what a page is really doing — without a laptop

EXPORT YOUR LOGS
Send your captured console logs to any app through the system share sheet — into a chat, an email, a notes app, or an AI assistant (one-time unlock).

PRIVACY FIRST
Your browsing and your captured logs stay on your device. Mobile Dev Browser does not upload the pages you visit or your console output. We collect only anonymous crash diagnostics and a few anonymous usage events to keep the app stable and improve it — no accounts, no personal data, no ads, and no tracking across other apps or websites.

Privacy policy: https://www.grainbox.com/mobile-dev-browser/privacy

What’s new

v0.9.23

Improved: Draw-to-AI-Prompt now produces a tighter, cleaner prompt. It captures the element you circled — its tag, styles, and CSS selector — without dumping the surrounding page markup, so the result pastes into your AI assistant ready to use.

Plus reliability and behind-the-scenes improvements.