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A Flutter package that simplifies displaying the visual difference between two images using a draggable slider. It enables side-by-side comparison with smooth transitions, ideal for before-and-after scenarios in apps like photo editing, medical imaging, or renovation previews. The package ensures null safety and supports multiple platforms including Android, iOS, Web, macOS, Windows, and Linux. It provides an intuitive interface for users to explore image changes interactively.
Use cases
Photo editing comparisons
Medical imaging analysis
Home renovation previews
Before/after product reviews
User experience testing
Key features
Draggable slider for image comparison
Null-safe Dart implementation
Cross-platform support
Smooth transition effects
Simple API integration
Responsive design
Suitable for
Developers building image comparison tools
Apps requiring visual change tracking
Educational or diagnostic applications
Interactive media presentations
Considerations
Requires two high-quality images for optimal results
Performance may vary with large image files
Limited customization options for slider appearance
Best suited for static image pairs
Not designed for video or animated content
Original README
Original README snapshot from the linked source repository. Visit the repository for the latest content.
👏 Before After
A flutter package which makes it easier to display the differences between two images..
The source code is 100% Dart, and everything resides in the /lib folder.
🔅 Gifs
💻 Installation
In the dependencies: section of your pubspec.yaml, add the following line:
All customizable attributes for BeforeAfter Widget
Attribute Name
Example Value
Description
beforeImage (Widget)
Image.asset('assets/before.jpg')
Sets the Before Image
afterImage (Widget)
Image.asset('assets/after.jpg')
Sets the After Image
isVertical (bool)
false
Sets the orientation of the slider
imageHeight (double)
100.0
Sets height of both the images
imageWidth (double)
200.0
Sets width of the images
imageCornerRadius (double)
16.0
Sets the corner radius of the images
thumbColor (Color)
Colors.red
Sets the color of the slider
thumbRadius (double)
16.0
Sets the radius of the thumb circle
overlayColor (Color)
Colors.yellow
Sets the color of the slider thumb overlay
👍 How to Contribute
Fork it
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request
📃 License
Copyright (c) 2022 Asad Khan
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Getting Started
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