What is the difference between Flutter SDK, Flutter Engine, and Dart VM?

Question

Accepted Answer

Three distinct things candidates often conflate: Flutter SDK — what you install via the flutter CLI. It's the umbrella that includes: The Dart Framework source code (what you import 'package:flutter/...' ). The Engine binaries (prebuilt per platform). A bundled Dart SDK (compiler, VM, analyzer). The flutter CLI itself. Flutter Engine — the C++ engine: Skia/Impeller, text layout, gestures, platform channels. Shipped as prebuilt binaries. Lives in a separate repo ( flutter/engine ). Dart VM — the runtime that executes Dart, embedded inside the Engine. JIT mode in debug (enables Hot Reload), AOT mode in profile/release (native ARM). Lives in dart-lang/sdk . The trap: candidates conflate 'Flutter SDK' with 'Dart SDK'. The clean mental model: **Flutter SDK is the umbrella** that bundles (1) the **Framework** (Dart source you import), (2) the **Engine** (prebuilt C++ binaries), and (3) the **Dart SDK** (compiler + VM). Knowing they live in *separate Git repos* (`flutter/flutter`, `flutter/engine`, `dart-lang/sdk`) is the senior detail.