Does it fit
Paste a URL or localhost and see your site on 123 real devices at once
Why it made the rally
Every screen gets a sticker, Fits, Tight, Spilling with the overflow in pixels, or Blocked, and one optional script tag turns on the measurements. Free to use, and it connects to Claude, ChatGPT, Codex or Cursor so you can ask whether a page fits on an iPhone.
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Discussion
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Quiet so far. Say what you noticed and start the thread.