12 breakpoints tested in 8 min
Coasty opens your site at every breakpoint, from 320px mobile to 2560px ultrawide, screenshots each view, identifies layout breaks, overflow issues, and responsive failures, then suggests specific CSS fixes for each problem.
breakpoints tested per page
How it works
Enter your URL
Provide the pages to test: homepage, key landing pages, or your entire site.
Every breakpoint is tested
Each page is rendered at 12 viewport widths: 320, 375, 414, 428, 768, 834, 1024, 1280, 1440, 1680, 1920, and 2560px.
Issues are captured
Layout breaks, text overflow, image distortion, touch target sizes, and spacing issues are screenshotted at the exact breakpoint where they occur.
Fixes are suggested
Each issue comes with a specific CSS fix suggestion (media query, flexbox adjustment, or spacing change) ready to implement.
What you get
Try it yourself
Test the responsive design of mysite.com at every breakpoint from 320px to 2560px. Screenshot every layout issue and suggest the exact CSS fix for each one.
Common questions
You can specify individual URLs or let Coasty crawl your site and test the most important pages automatically (homepage, pricing, features, blog).
Both. Coasty identifies visual layout breaks and inspects the DOM to suggest specific CSS property changes (media queries, flex adjustments, max-widths).
Yes, run a design review, implement fixes, then run again. Coasty will show which issues are resolved and flag any new ones.