Become a Mobile Developer
Mobile development means building the apps people carry everywhere. On iOS you write Swift; on Android you write Kotlin. This path teaches both native tracks so you can ship to billions of devices on either platform. It's for people who want to build things they can hold in their hand and show friends, and both ecosystems have excellent free courses. Reaching a level where you can build and publish a real app takes about 6 to 12 months of part-time study.
Yes, you can learn mobile development for free and build real apps for iPhone and Android. iOS apps are written in Swift, Android apps in Kotlin, and both have first-class free courses: Paul Hudson's 100 Days of Swift and SwiftUI for iOS, and Google's official Android Basics with Compose for Kotlin. Start with programming fundamentals, then pick a platform or learn both. Software developer roles, which include mobile developers, are projected to grow 17% through 2033, much faster than average. Expect 6 to 12 months of part-time work before you can build and publish a polished app.
Software developer employment, which includes mobile app developers, is projected to grow 17% from 2023 to 2033, much faster than the average for all occupations, with a median annual wage of $130,160 (source: U.S. Bureau of Labor Statistics, https://www.bls.gov/ooh/computer-and-information-technology/software-developers.htm).
Your Step-by-Step Path
Step 1: Programming Foundations
Build a solid CS foundation before diving into platform-specific development. Harvard CS50 covers the fundamentals every mobile developer needs.
CS50's Introduction to Computer Science
100h · Free
Step 2: Learn Swift
Apple's modern language for iOS development. 100 Days of Swift takes you from zero to confident in the language itself.
100 Days of Swift
100h · Free
Step 3: Build iOS Apps with SwiftUI
SwiftUI is Apple's modern UI framework. 100 Days of SwiftUI teaches you to build real, polished iOS apps from scratch.
100 Days of SwiftUI
100h · Free
Step 4: Learn Android with Kotlin
Google's official Android Basics with Compose course teaches Kotlin and Jetpack Compose, the modern way to build Android apps.
Android Basics with Compose
80h · Free
Step 5: Deepen Your Kotlin
Go beyond the basics with Google's Kotlin Bootcamp. It covers coroutines, extensions, and advanced language features used in production Android apps.
Kotlin Bootcamp for Programmers
16h · Free
More Courses to Explore
Paul Hudson's free 100-day course on SwiftUI — the modern way to build iOS apps. Each day is one short lesson plus a hands-on project. Covers Swift fundamentals, SwiftUI, animations, networking, and shipping to the App Store.
Paul Hudson's free 100-day course teaching Swift and UIKit. A more classic iOS path covering Auto Layout, Core Data, and shipping UIKit-based apps. Best for learners who'll work on existing UIKit codebases.
Frequently Asked Questions
Should I learn iOS or Android first?
Pick the platform whose phone you own, so you can test on your own device. iOS (Swift) has famously polished learning materials in 100 Days of Swift; Android (Kotlin) has Google's official free course. Either is a fine starting point.
Can I build apps for both iOS and Android at once?
Natively, you write each platform separately (Swift for iOS, Kotlin for Android). Cross-platform tools like React Native or Flutter let you share code, but learning one native stack first gives you a stronger foundation.
Do I need a Mac to develop iOS apps?
For building and publishing to the App Store, yes. iOS development requires Xcode, which runs only on macOS. You can learn Swift fundamentals on any machine, but shipping an iPhone app needs a Mac.
How long does it take to build a publishable app?
With steady effort, 6 to 12 months. The 100 Days of Swift and SwiftUI courses are structured to get you building real apps within the first few weeks, well before you finish.
Is mobile development a good career in 2026?
Yes. Mobile is where a huge share of software time is spent, and demand for developers who can ship native apps stays strong. It falls under the software developer category, which the BLS projects growing 17% through 2033.