What is doesitfit?
Shows a site at the real viewport size of 123 phones, tablets and laptops and flags overflow.
Who is doesitfit best for?
doesitfit is best for people building sites with AI who need to see where a page spills past a phone screen.
Checking AI-built sites
Paste a live or localhost address and see it on every screen at its real CSS size, each marked Fits, Tight or Spilling.
Fixing sideways scrolling
The label gives the overflow in pixels, and the MCP connector names the element that sticks out so an agent can fix it.
Looking up device sizes
Its device pages list the CSS viewport of current iPhones, Galaxy and Pixel phones, iPads, MacBooks and monitors.
How much does doesitfit cost?
doesitfit is free with no sign-up: the web app, the MCP connector and the local version for localhost cost nothing, with checks capped at a few dozen per site an hour.
- Real viewport sizes for 123 devices
- MCP connector for Claude, ChatGPT, Codex and Cursor
- A few dozen checks per site an hour
There is no paid plan. A local version, run with Node.js and Chrome, checks sites that only run on your own computer, such as localhost:3000. Full pricing on doesitfit.lol. We checked these prices on .
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How do I connect Does It Fit to my AI agent?
doesitfit MCP is Does It Fit's official MCP server. Add it to your agent once, then ask it to check whether your site's layout fits on an iPhone screen.
Lets your agent test how a page lays out at iPhone sizes, so you catch overflowing text, cut-off buttons and sideways scrolling before you ship.
$ claude mcp add --transport http does-it-fit https://doesitfit.lol/mcp
Claude Code connects to Does It Fit over the web.
Does It Fit's setup guide covers the sign-in.
Then ask your agent
- Runs
- On the web
- Sign-in
- See guide
- Checked
- Answered 13 Nov
- Guide
- doesitfit.lol
Questions about doesitfit
What is doesitfit?
Shows a site at the real viewport size of 123 phones, tablets and laptops and flags overflow.
Who is doesitfit for?
doesitfit is best for people building sites with AI who need to see where a page spills past a phone screen.
Is doesitfit free?
Yes. doesitfit has a free plan: real viewport sizes for 123 devices.
Does Does It Fit have an MCP server?
Yes. doesitfit MCP is Does It Fit's official MCP server, so agents such as Claude Code, Cursor, Codex and GitHub Copilot can check whether your site's layout fits on an iPhone screen. Does It Fit runs it on the web.
Where can I try doesitfit?
On its official website, doesitfit.lol.
Does doesitfit work with localhost?
Yes. The web app loads localhost in Chrome once you allow access to apps on your device; Safari does not allow it. The local MCP version, run with Node.js and Chrome, checks localhost sites for Claude Code, Codex or Cursor.
Do I need to add code to my site for doesitfit?
Only for the fit labels. Viewing a site on every screen needs just its link; measuring overflow needs one script line from doesitfit in the page head, which does nothing for normal visitors.
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