Common Issues mobile

My App Looks Terrible on Phones

Your app or website looks great on a computer, but when you or your customers open it on a phone, it's a disaster. Text is tiny and unreadable, content spills off the edges of the screen, menus overlap with other elements, or you have to pinch and zoom just to use it.

This is a huge problem because more than half of all internet traffic comes from phones. If your app doesn't work on mobile, you're turning away the majority of your potential users or customers. They'll leave and never come back.

AI tools often generate apps that look great on a desktop monitor but weren't properly tested or designed for smaller screens. The good news is that most mobile layout problems can be fixed without redesigning the entire app.

Error Messages You Might See

No error messages — just a poorly displayed layout Content wider than viewport (in Google Search Console) Mobile usability issues detected (Google warning) Text too small to read (Google PageSpeed)
No error messages — just a poorly displayed layoutContent wider than viewport (in Google Search Console)Mobile usability issues detected (Google warning)Text too small to read (Google PageSpeed)

Common Causes

  • Missing viewport tag — Your app's HTML is missing a small piece of code that tells phones how to display it, so the phone shows the desktop version shrunken down
  • Fixed-width layouts — Elements are set to exact pixel sizes (like 1200px wide) instead of adapting to the screen size
  • No mobile-friendly design rules — The CSS (styling code) doesn't include any adjustments for smaller screens
  • Images too large — Big desktop images don't resize on mobile, causing horizontal scrolling
  • AI prioritized desktop — The AI tool built the desktop version first and didn't properly adapt it for mobile

How to Fix It

  1. Test on a real phone — Open your website on your actual phone to see exactly what users experience. Screenshots from desktop tools can miss real issues
  2. Use your browser's mobile preview — On your computer, press F12 then click the phone/tablet icon to preview how the site looks on different phones
  3. Ask a developer to add responsive design — A developer can add the viewport tag and mobile-friendly CSS rules to make your layout adapt to any screen size
  4. Check that images are responsive — All images should have max-width: 100% so they shrink to fit the screen instead of overflowing
  5. Test the most important pages first — Focus on fixing the homepage, product pages, and checkout flow for mobile before worrying about less-visited pages

Real developers can help you.

Matthew Jordan Matthew Jordan I've been working at a large software company named Kainos for 2 years, and mainly specialise in Platform Engineering. I regularly enjoy working on software products outside of work, and I'm a huge fan of game development using Unity. I personally enjoy Python & C# in my spare time, but I also specialise in multiple different platform-related technologies from my day job. Vlad Temian Vlad Temian 15+ years shipping production infrastructure for startups. Former CTO at qed.builders (acquired by The Sandbox). Cursor ambassador and agentic tooling builder. I've scaled systems, automated deployments, and built observability tools for AI coding workflows. I specialize in taking vibe-coded apps from broken prototype to production-ready: fixing Supabase auth/RLS, Stripe integrations, deployment pipelines, and cleaning up AI-generated spaghetti. I build tools in this space (agentprobe, claudebin, micode) and understand both sides: how AI generates code and why it breaks. https://blog.vtemian.com/ Bastien Labelle Bastien Labelle Full stack dev w/ 20+ years of experience Pratik Pratik SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure Franck Plazanet Franck Plazanet I am a Strategic Engineering Leader with over 8 years of experience building high-availability enterprise systems and scaling high-performing technical teams. My focus is on bridging the gap between complex technology and business growth. Core Expertise: 🚀 Leadership: Managing and coaching teams of 15+ engineers, fostering a culture of accountability and continuous improvement. 🏗️ Architecture: Enterprise Core Systems, Multi-system Integration (ERP/API/ETL), and Core Database Structure. ☁️ Cloud & Scale: AWS Expert; architected systems handling 10B+ monthly requests and managing 100k+ SKUs. 📈 Business Impact: Aligning tech strategy with P&L goals to drive $70k+ in monthly recurring revenue. I thrive on "out-of-the-box" thinking to solve complex technical bottlenecks and am always looking for ways to use automation to improve business productivity. Basel Issmail Basel Issmail ’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems. My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale. In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals. I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software. Jared Hasson Jared Hasson Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever Daniel Vázquez Daniel Vázquez Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting. Meïr Ankri Meïr Ankri Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews. Antriksh Narang Antriksh Narang 5 years+ Experienced Dev (Specially in Web Development), can help in python, javascript, react, next.js and full stack web dev technologies.

Describe what's wrong in plain English. No technical knowledge needed.

Get Help

Frequently Asked Questions

Why does it look fine on my computer but not my phone?

Computer screens are typically 1200-1920 pixels wide, while phones are only 375-430 pixels wide. If your app was built for the wider screen without rules for adapting to smaller screens, it will look squished or require scrolling on a phone.

Will fixing the mobile layout affect how it looks on desktop?

No, if done properly. Responsive design uses conditional rules — mobile devices get one layout, tablets get another, and desktops keep the original. A developer can add mobile rules without changing anything on desktop.

Related Common Issues Issues

Can't fix it yourself?
Real developers can help.

You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.

Get Help