Hot Reload vs Hot Restart in Flutter

 🔁 Hot Reload

✅ What It Does:

Injects updated source code into the running Dart VM.


Updates the UI instantly without losing current app state (e.g., form inputs, scroll position).


Rebuilds widget tree only, not the entire app.


🧠 Use When:

Making UI changes (colors, layout, text).


Editing widget properties or build methods.


Adjusting styles or animation durations.


⚡ Benefits:

Very fast


Keeps app state


Great for quick UI iterations


❌ Limitations:

Won’t reflect changes in:


main() function


Global state initialization


initState() logic


Dependencies or assets (e.g., new images, fonts)


🔄 Hot Restart

✅ What It Does:

Restarts the app from scratch, re-runs main().


Clears all runtime states and resets the app to its initial state.


🧠 Use When:

Changing global variables or constants


Adding new dependencies or packages


Making changes to initState() or main()


Needing a clean slate for debugging


⏳ Drawbacks:

Slower than hot reload


Loses all current app state (you’ll start from splash/login screen again)


🧪 Quick Comparison Table

Feature Hot Reload Hot Restart

Keeps App State ✅ Yes ❌ No

Restarts main() ❌ No ✅ Yes

Speed ⚡ Very Fast 🐢 Slower

UI Updates ✅ Yes ✅ Yes

Global Variable Reset ❌ No ✅ Yes

Dependency/Asset Update ❌ No ✅ Yes


💡 Tip:

Use Hot Reload for frequent UI changes and Hot Restart when things seem “off” or you’ve changed app structure, logic, or dependencies.

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