Free tool
Peek screens.
Check a preview deploy on phone, tablet, and desktop at once, straight from your phone. Made for the moment a coding agent pushes a branch and you want to see every breakpoint before you merge.
How it works
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Paste a URL
Any https address works: a branch preview on Cloudflare, Vercel, or Netlify, a staging site, or production.
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Scroll the breakpoints
iPhone, iPad, and Full HD by default, each laid out at its real viewport and scaled to fit your screen.
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Dig into one size
Rotate it, reload it, or open it on its own page. Add, rename, or switch off sizes under Devices.
No account and no backend: your sizes and recent URLs stay in this browser's local storage. The previewed address is part of the page URL, so any preview link can be shared.
Blank frame?
Many sites refuse to be shown inside another page (X-Frame-Options or a CSP
frame-ancestors rule). To preview your own deploys here, allow this origin, for example
Content-Security-Policy: frame-ancestors 'self' https://karolbinkow.ski, or use the new-tab button on the frame.
Previews behind Cloudflare Access or another login need a signed-in session in this browser first. Plain
http only works for localhost.
AI engineering consulting
Shipping with coding agents?
Branch previews per agent run, CI that catches what agents miss, review loops you can drive from your phone. I set up the workflow so agent output is safe to merge.