React/Next.js Website or Mobile App: What to Choose for Your Business

One of the first questions businesses ask is: "Do we need a website or a mobile app?" The answer depends on your goals, audience, and budget. Let's break down each option.

• Accessibility — works in any browser, on any device
• SEO — indexed by search engines, drives organic traffic
• Quick launch — development takes as little as 2 weeks
• Easy updates — changes are available to all users instantly
• No moderation — no need to wait for App Store or Google Play approval

• Informational website or landing page
• E-commerce store or marketplace
• Corporate portal
• SaaS platform
• You need organic traffic from search engines

React is the most popular library for building user interfaces. Next.js adds server-side rendering, which is critical for SEO and page load speed. Together they provide:

• SSR/SSG — pages are generated on the server for fast loading
• TypeScript — strict typing reduces the number of bugs
• Image optimization — automatic conversion to WebP
• Internationalization — built-in multi-language support

• Performance — runs faster than a web application
• Offline mode — available without internet
• Push notifications — direct communication channel with users
• Hardware access — camera, GPS, Bluetooth, sensors
• Store presence — users find you through App Store and Google Play

• The app needs access to camera, GPS, or sensors
• Offline mode is important
• Push notifications are needed for user retention
• The product is designed for daily use
• Performance is critical (games, video, AR)

Swift (iOS) and Kotlin (Android) are native languages that provide maximum performance and access to all platform capabilities.

React Native is a cross-platform solution that allows writing one app for both platforms. It saves 30–40% of budget but has performance limitations.

• Landing page — 2–4 weeks
• Web application — 2–4 months
• Mobile app (single platform) — 3–5 months
• Mobile app (both platforms) — 4–7 months

• Web — updates are instant, cost is minimal
• Mobile — every update requires store review (1–7 days)

• Web — the entire internet, any device
• Mobile — only users who have installed the app

For many businesses, the optimal solution is to start with a web application and then add mobile:

• Phase 1 — launch a web app on Next.js. Attract audience through SEO
• Phase 2 — develop a mobile app for loyal users
• Phase 3 — a single backend serves both platforms

This approach lets you get to market quickly and validate hypotheses before making large investments in mobile development.

At 3IT, we develop both web applications and mobile solutions. Our stack covers both platforms: React and Next.js for web, Swift and Kotlin for native mobile development. We will help you choose the right format for your business and bring it to life.

Contact us for a free consultation — we will figure out what works best for you.