before_after: a Flutter developer's guide

A flutter package which makes it easier to display the difference between two images.

CategoryLibrary/Tooling
Stars★ 1,031
Last update2024-11-16
PriorityLow

before_after is an open-source developer tooling library for Flutter mobile app development, with 1,031★ on GitHub and last updated on 2024-11-16. This guide covers what before_after does, why it matters in 2026, how to add it to your project, when to reach for it, and how it compares to the alternatives — plus a quick FAQ.

What is before_after?

A flutter package which makes it easier to display the difference between two images. It focuses on improving your Flutter developer workflow and codebase. The project lives at xsahil03x/before_after and is maintained by xsahil03x.

Why before_after is worth knowing in 2026

before_after carries 1,031 GitHub stars, 109 forks, 2 open issues. It has been around since 2019, and is mature and stable. For a Library/Tooling option, that combination of adoption and upkeep usually means a healthy community, production usage, and plenty of examples to learn from — the things that make a dependency safe to build on.

Installing before_after

Add the package to your pubspec.yaml:

dependencies:
  before_after: ^latest

Then fetch it and import it in your Dart code:

flutter pub get
import 'package:before_after/before_after.dart';

Check the package’s example/ directory and its pub.dev page for the exact API — before_after is versioned there with full docs so you always integrate against the current release.

When should you use before_after?

Reach for before_after when:

  • you want to automate or streamline part of your build
  • you need better debugging, codegen, or DX
  • you’re standardising tooling across a team

It’s especially relevant if your project touches before-after, dart, flutter, flutter-package, hacktoberfest, slider.

before_after vs. the alternatives

If you’re weighing options in the Library/Tooling space, these are the other projects developers most often compare before_after against:

There’s no single winner — the right pick depends on your app’s size, your team’s familiarity, and your performance budget. Browse the full Library/Tooling collection to compare them side by side.

Frequently asked questions

Is before_after free to use?

Yes. before_after is open source and free to use in your Flutter projects. You can view the source, report issues, and contribute on GitHub.

Does before_after work on both iOS and Android?

before_after is built for Flutter, so it targets iOS and Android from a single codebase, and typically web and desktop too depending on the project’s platform support.

As of 2026, before_after has around 1,031 stars and 109 forks on GitHub, which puts it among the more widely used options in the Library/Tooling space.

What are good alternatives to before_after?

Popular alternatives in the Library/Tooling category include flclash, ente, nativescript. The best choice depends on your app’s size, team, and performance needs.

How do I install before_after?

Add before_after to the dependencies section of your pubspec.yaml and run flutter pub get. Full versions and API docs are on pub.dev.

Resources & links

Part of FlutterCook — 500 hands-on guides to the best open-source Flutter libraries, UI kits, and apps. Explore the live GitHub trends or browse YouTube guides.

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