"Should we build a web app or a mobile app?" This is one of the first decisions every founder and product manager has to make. And the answer is not always obvious.
Both options have real trade-offs. Here is an honest comparison to help you decide.
What They Actually Are
A web app runs in a browser. Users access it by typing a URL. No download required. Think: Gmail, Notion, Figma, most SaaS products.
A mobile app is installed on a phone from the App Store or Google Play. It lives on the home screen and can access device features like the camera, GPS, and push notifications. Think: Instagram, Uber, WhatsApp.
A progressive web app (PWA) is a hybrid — a web app that can be installed on a phone's home screen and works offline. It blurs the line between the two.
When to Build a Web Ap
Web apps are the right choice when:
Your product is primarily used on desktop. Dashboards, admin panels, analytics tools, and most B2B SaaS products are used on laptops and desktops. A web app is the natural fit.
You need to launch fast. Web apps have a single codebase that works everywhere. No App Store approval. No separate iOS and Android builds. You can update instantly.
SEO matters. Web apps can be indexed by search engines. Mobile apps cannot. If organic search traffic is part of your growth strategy, you need a web presence.
Budget is tight. Web app development typically costs 30 to 50% less than mobile app development. One codebase instead of two (or three, counting the backend).
When to Build a Mobile App
Mobile apps are the right choice when:
Your users are on the go. Field service workers, delivery drivers, sales reps. If your users need your product while walking around, a mobile app provides a better experience.
Hardware access is essential. Camera, GPS, Bluetooth, accelerometer, biometrics. While web APIs are catching up, native mobile apps still have better access to device hardware.
Push notifications drive engagement. While web push notifications exist, mobile push is more reliable and more commonly accepted by users.
Offline use is critical. Mobile apps can store data locally and sync when connectivity returns. This matters for apps used in areas with poor internet coverage.
When to Build Both
Some products genuinely need both. A SaaS product might have a web dashboard for power users and a mobile companion app for on-the-go access. An e-commerce platform might have a web storefront and a mobile app for loyal customers.
If you need both, build the web app first in most cases. It is faster and cheaper to iterate. Use what you learn from web users to inform the mobile app design.
The Cost Comparison
Web app: $15,000 to $100,000+ (one codebase)
Mobile app (cross-platform): $25,000 to $150,000+ (one codebase, both platforms)
Mobile app (native, both platforms): $50,000 to $300,000+ (two codebases)
Cross-platform frameworks like React Native and Flutter have made mobile development significantly more affordable. But web apps are still cheaper to build and maintain.
Our Recommendation
For most startups, start with a web app. Get traction. Validate the product. Then build a mobile app when the data tells you your users need one.
If your product is inherently mobile — fitness tracking, navigation, photography — start with mobile. But that is the exception, not the rule.