DarnlyWhat browser am I using?
Your browser, system, screen and settings in one look, read live from this browser. One click copies it all as a clean block for a bug report.
Free from Darnly. Spot a bug in the app you're building? Darnly hands it to Claude Code, Codex or Cursor in one key.Add to Chrome
Your browseronyour system
DesktopSee what gets copied
Technical details: user agent, client hints, graphics
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How it works
- Open this page. Your browser, system, screen and settings show up straight away, read live from your own browser.
- Resize the window or switch dark mode on and off: the cards update as you go. The viewport drawing shows how much of your screen the page actually gets.
- Press Copy for a bug report and paste the block into a GitHub issue, Linear, Slack, an email or your chat with Claude Code, Cursor or Codex. Your IP address is left out unless you tick the box.
- Supporting someone? Press Copy link to send to a user, send it, and ask them to paste back what they copy.
Questions
Why do developers ask “what browser are you on?”
Because the same page can behave differently in Safari, Chrome and Firefox, at different window sizes, in dark mode or on a touch screen. Knowing the exact browser, version, viewport and settings lets them reproduce the bug on their own machine instead of guessing.
What is the viewport, and why is it different from my screen size?
The viewport is the part of the window the page is drawn in, without the tabs, address bar and dock. Most layout bugs depend on the viewport, not the screen. If a bug only shows up when the window is narrow, the viewport width (and its Tailwind breakpoint, like md) is the number to share.
What is device pixel ratio?
How many real screen pixels make up one CSS pixel. Retina Macs and most phones are 2x or 3x; many Windows laptops are 1.25x or 1.5x from display scaling. Blurry images or 1px lines that look thick usually come down to this. Browser zoom changes it too.
Why can’t it tell my exact macOS version or Windows 11?
Browsers stopped putting those in the user agent to make tracking harder: every Mac says “10.15.7” and Windows 11 says “Windows NT 10.0”. Chrome and Edge still share the real version when a page asks politely (client hints), so this page asks. Safari and Firefox don’t, so it says so instead of guessing.
Do you store my IP address?
No. The page asks darnly.dev for your country and IP address, which come from the request your browser already made, and the answer goes straight back to you. This tool doesn’t save it. Everything else is read inside your browser and never leaves it.
Why does it say “Instagram in-app browser”?
Links opened inside Instagram, Facebook, TikTok, LinkedIn or X open in the app’s own built-in browser, which is a different browser from Safari or Chrome. It often breaks logins, downloads and payments. If a user reports a bug from one of these, that is a big clue.