Advanced Image Comparison
An intuitive, open-source tool for detailed visual image comparison — ideal for designers, photographers, upscaling enthusiasts, and researchers.
What is Improve-ImgSLI?
Creating detailed visual comparisons is often a time-consuming process that requires manual frame alignment in a graphics editor. Improve-ImgSLI was created to transform this task from tedious routine into a fast and intuitive process. It's a powerful open-source tool designed for everyone who values precision in details: designers, photographers, upscaling enthusiasts, and researchers.
The key value of the program lies in its efficiency. It allows you not just to see the difference between two images, but to deeply analyze it with synchronized controls, advanced magnifier with various interpolation methods, and flexible comparison modes. Forget about lengthy preparation — with Improve-ImgSLI you get professional and clear results in just a few clicks.
See It in Action
Powerful Features
Customizable UI
Experience a clean, modern interface. The app automatically adapts to your system's theme, or you can manually select Light/Dark mode and even choose a custom UI font.
Advanced Magnifier
Choose from Nearest Neighbor, Bilinear, Bicubic, or Lanczos interpolation. Enjoy unclipped rendering and dual/split-circle views for pixel-perfect analysis.
Smart Workflow
Manage images with drag & drop reordering, a rating system, and quick actions (short/long press). Hold Spacebar to instantly preview a single image in full.
WYSIWYG Export
Export exactly what you see — including the splitter and magnifier — to high-res images. Control format (PNG, JPG, WEBP), quality, and add custom text overlays.
Synchronized Views
Compare images side-by-side or over-under. All interactions like panning and zooming are perfectly synchronized for precise analysis with a smooth, draggable splitter.
Performance Optimized
A configurable display cache ensures smooth performance with large images, while always using the original file's quality for the magnifier and final exports.
Get Started
Windows
Direct download for the latest installer. Simple and straightforward.
Linux (Flatpak)
Universal Linux package via Flathub for easy installation across distros.
flatpak install io.github.Loganavter.Improve-ImgSLI
Arch Linux (AUR)
Community-maintained package for Arch Linux users.
yay -S improve-imgsli
Python (Source)
Run directly from source with our powerful launcher script.
git clone https://github.com/Loganavter/Improve-ImgSLI.git
cd Improve-ImgSLI
./launcher.sh run