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.

Luca Liberati Luca Liberati I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture 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. Yovel Cohen Yovel Cohen I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well. 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. Jaime Orts-Caroff Jaime Orts-Caroff I'm a Senior Android developer, open to work in various fields Dor Yaloz Dor Yaloz SW engineer with 6+ years of experience, I worked with React/Node/Python did projects with React+Capacitor.js for ios Supabase expert Jacek Rozanski Jacek Rozanski Senior PHP/Symfony developer and DevOps engineer with 20+ years of professional experience, running opcode.pl (web development agency, est. 2004). Day job: I'm the sole backend developer at merketing company where I own and maintain 11 PHP/Symfony microservices on AWS (ECS Fargate, RDS, S3, CloudFront), handle the full CI/CD pipeline (Bitbucket Pipelines, Docker), and manage monitoring with Sentry and CloudWatch. These services handle high request volumes in production every month. What I bring to AI-built apps: - I audit and fix security issues (OWASP methodology), performance bottlenecks, and architectural problems in codebases generated by Cursor, Claude Code, Lovable, Bolt, and v0 - I refactor AI-generated prototypes into production-grade applications with proper error handling, testing, and clean architecture (SOLID, DDD, hexagonal architecture) - I set up the infrastructure AI tools don't touch: AWS hosting, CI/CD pipelines, automated deployments, database optimization, monitoring, and alerting - I integrate external services: payment providers, email systems, partner APIs, SSO/auth Tech stack: PHP 8.x, Symfony, React, Next.js, PostgreSQL, MySQL, Docker, AWS (ECS, RDS, S3, SQS/SNS, CloudFront), Terraform, Supabase. I also use AI tools daily (Claude Code, Cursor) in my own workflow, so I understand both the strengths and the gaps in AI-generated code. Based in Poland (CET timezone). Available for async work and calls during EU/US business hours. Caio Rodrigues Caio Rodrigues I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures. I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations. Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization. I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems. My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.** Mehdi Ben Haddou Mehdi Ben Haddou - Founder of Chessigma (1M+ users) & many small projects - ex Founding Engineer @Uplane (YC F25) - ex Software Engineer @Amazon and @Booking.com Stanislav Prigodich Stanislav Prigodich 15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it.

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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.

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