Viewpo
Paste a URL. Get a responsive grade.
Real browser screenshots at phone, tablet, and desktop. Automated checks for overflow, touch targets, contrast, and accessibility. A-F grade with specific fixes. No install required.
What it checks
5 automated checks live, with 4 more coming.
Overflow
Elements wider than the screen that cause horizontal scrolling on phones.
Touch targets
Buttons and links too small to tap — frustrating and inaccessible on mobile.
Contrast
Text that's hard to read against its background — fails accessibility standards.
Images
Missing alt text, oversized images, no lazy loading — slow load times, broken accessibility, wasted bandwidth.
Accessibility
Missing landmarks, broken heading order, unlabelled inputs — fails WCAG compliance.
Core Web Vitals — coming soon
LCP, CLS, INP measurement per viewport — Google uses these metrics for ranking.
SEO & Social Preview — coming soon
OG tags, Twitter cards, JS rendering gap — missing meta tags mean ugly link previews and poor search visibility.
Design Token Compliance — coming soon
Brand colour, spacing, and typography consistency checking across every viewport.
Interactive Sessions — coming soon
Live AI agent interaction — click, type, scroll, and interact with your site in real-time.
What you'll discover
- See your site at every screen size — real browser screenshots, not iframe resizes
- Get an A-F grade with specific issues to fix — no CSS knowledge needed
- Share audit reports with a link — replace screenshots and Slack threads
- Add responsive quality gates to your CI pipeline or AI agent workflow
- Interactive sessions will let AI agents click, type, and scroll in real-time (coming soon)
What Viewpo includes
Real browser rendering
Chromium renders your site at each viewport — not an iframe resize. Works on every site, including those that block embedding.
A-F responsive grade
Automated audit runs 5+ checks across every viewport — overflow, touch targets, contrast, images, accessibility. One clear score you can share with clients or teammates.
Plain-language explanations
"This element is wider than the screen on mobile" — not "overflow detected on .hero-container". You don't need CSS knowledge to understand the results.
Shareable report links
Every audit generates a unique URL. Anyone can view it without signing up. Replace "let me take some screenshots" with "here's the report link".
HTTP API — coming soon
JSON API that any tool can call. Send a URL, get back screenshots, audit results, and a grade. Works with Claude Code, Cursor, GitHub Actions, or any HTTP client.
Interactive Sessions — coming soon
AI agents click, type, scroll, and interact with your site in real-time via persistent browser sessions. Compact element refs use a fraction of the context of raw DOM.
Get notified when Viewpo is ready
Leave your details and I'll let you know when it's available.
No spam, ever. Privacy Policy
"I kept building sites with AI tools and had no idea if they actually worked on phones until someone complained. Open DevTools, drag the viewport, squint — rinse and repeat for every breakpoint. I needed something that would render my site at every screen size in one go and tell me what's broken, not just show me a smaller window."
Who It's For
Vibe-Coders
"Does my AI-built site actually work on phones?"
Builders using AI to create websites who need to verify responsive quality.
You need: Paste the URL, get a grade in seconds, fix the issues, re-audit.
Designers
"How do I share responsive issues with my team?"
Designers who need to communicate viewport issues quickly.
You need: See all viewports at once. Share a report link instead of screenshots.
Developers
"Can I add responsive checks to my CI pipeline?"
Developers who want automated responsive quality gates.
You need: Every PR preview deploy gets audited. Grade below B? The check fails.
AI Agents
"How do I close the visual feedback loop?"
AI coding agents that need to verify their CSS output.
You need: Call the API, get grade + issues, fix CSS, re-audit, get Grade A.
Questions about Viewpo
What is Viewpo?
Is Viewpo free?
How is this different from browser DevTools?
Does Viewpo work with sites behind authentication?
Can AI agents use Viewpo?
Who built Viewpo?
How Viewpo compares
- • Browser DevTools resizes a viewport — Viewpo renders in a real Chromium instance and runs automated checks with an A-F grade.
- • Responsively App shows live previews — Viewpo adds automated auditing, grading, shareable reports, and an API.
- • BrowserStack tests on real devices — Viewpo focuses specifically on responsive design quality with instant results and plain-language explanations.
- • Lighthouse checks performance — Viewpo checks responsive design specifically: overflow, touch targets, contrast, images, and accessibility at every viewport.
Roadmap
Coming Soon
- Core Web Vitals — CLS, LCP, INP measurement per viewport
- SEO & Social Preview — meta tags, OG images, social cards
- Design Token Compliance — brand colour, spacing, and typography consistency
- Interactive Sessions — persistent browser sessions with ref-based interaction and WebSocket streaming
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