"Before you learn how Flutter works, understand why it was built. Every technology exists to solve a problem — Flutter's problem was one of the most frustrating in software development."

Every developer who has tried to build a mobile app has faced this moment: you build something for Android. It works great. Then you realise you need an iOS version too. So you learn Swift or Objective-C, rewrite the entire app, maintain two separate codebases, fix the same bug twice, and spend twice the time, money, and effort.

Flutter was built to end this. One codebase. One language. Android, iOS, web, desktop — all from the same code.

What Is Flutter — The Plain English Definition

Flutter is a free, open-source UI framework created by Google that allows you to build natively compiled applications for mobile (Android and iOS), web, and desktop from a single codebase.

It uses the Dart programming language — also created by Google — and comes with its own rendering engine called Skia (now Impeller on newer versions) that draws every pixel on screen directly, without using native UI components.

Approach
What it does
Example
Native Development
Write separate apps for each platform using platform language
Kotlin for Android, Swift for iOS
Hybrid / WebView
Wrap a web app in a native container
Cordova, Ionic
Cross-Platform Bridge
Write once, translate to native components via bridge
React Native
Flutter
Write once, render everything itself — no bridge, no WebView
Flutter draws its own UI on a canvas

The Key Insight: Flutter Draws Its Own Pixels

This is what makes Flutter different from everything else. React Native, for example, talks to native components — it says "give me an Android Button" and Android draws it. This creates a bridge between JavaScript and native code that can slow things down.

Flutter does not do this. Flutter has its own rendering engine. When you build a Button in Flutter, Flutter draws that button itself — pixel by pixel — on a canvas. This means:

  • Your UI looks exactly the same on Android and iOS — no platform-specific quirks
  • Performance is close to native because there is no bridge overhead
  • You have complete control over every pixel on screen
  • Custom animations and designs are easy — you're not fighting platform UI constraints
🎯 Real Analogy Think of native development as buying furniture from IKEA — you get what they offer. Flutter is like having a carpenter who builds exactly what you want from scratch. More work upfront, but total control over the result.

What Can You Build With Flutter?

Flutter targets 6 platforms from one codebase:

  • Android — APK and AAB files for the Play Store
  • iOS — IPA files for the App Store
  • Web — Runs in any modern browser
  • Windows — Native Windows desktop app
  • macOS — Native Mac desktop app
  • Linux — Native Linux desktop app

For most learners and startups, the primary use case is Android + iOS mobile apps. Web and desktop support is good but mobile is where Flutter truly shines.

Who Uses Flutter in Production?

  • Google Pay — one of the highest-traffic apps in the world, built on Flutter
  • BMW App — the official BMW connected car application
  • eBay Motors — the eBay vehicle marketplace app
  • Alibaba's Xianyu — 50+ million users
  • Reflectly — popular journaling app

Flutter vs React Native — The Real Comparison

This is the most common question beginners ask. Here is the honest answer:

Factor
Flutter
React Native
Language
Dart (learn new)
JavaScript (know already?)
Performance
Excellent (no bridge)
Good (JS bridge overhead)
UI Consistency
Identical on all platforms
Platform-specific components
Hot Reload
✅ Excellent
✅ Good
Package ecosystem
Growing fast (pub.dev)
Larger (npm)
Backed by
Google
Meta (Facebook)
Best for
Pixel-perfect custom UI, high performance
Teams with existing JS knowledge
💡 MCT Recommendation If you are starting from zero — learn Flutter. The performance advantage, UI consistency, and Google's investment make it the stronger long-term choice for mobile development in 2026.

The Learning Path Ahead — Flutter Getting Started Series

This blog is the first in the Flutter Getting Started series on RR Skillverse. Here is what you will learn across the series:

1️⃣
What Is Flutter
You are here — the why and what before the how.
2️⃣
Flutter Setup
Step-by-step environment setup on Windows and macOS.
3️⃣
Flutter vs Native
The cross-platform advantage — why one codebase works for both platforms.
4️⃣
Introduction to Dart
Just enough Dart to start reading and writing Flutter code.
5️⃣
Flutter Project Structure
lib, pubspec.yaml, assets — every folder and file explained.

Key Takeaways

  • Flutter is Google's open-source framework for building apps on Android, iOS, web and desktop from one codebase
  • Flutter draws its own UI — it doesn't use native platform components, giving it performance and consistency advantages
  • Flutter uses Dart — a language designed by Google specifically to be easy to learn and fast to compile
  • Major companies (Google Pay, BMW, eBay) use Flutter in production at scale
  • Flutter vs React Native: choose Flutter for performance and UI control, React Native if your team already knows JavaScript
📚 Continue in This Series