Improve ImgSLI

2 likes

Improve-ImgSLI is a free, open-source image comparison tool for designers, photographers, and AI upscaling enthusiasts. It lets you compare two images side-by-side or over-under with a draggable splitter, an advanced magnifier (Nearest Neighbor, Bilinear, Bicubic, Lanczos), and...

Cost / License

Free
Open Source (GPL-3.0)

Origin

Russia

Since

Since 2025

Updated

Updated Nov 2026

Releases

6 releases last year6 last year

Platforms

Windows
Linux
Arch Linux
Flathub
Flatpak

Alternatives

2likes

3alternatives

0articles

Properties

Privacy focused
Lightweight

Features

Ad-free
Extensible by Plugins/Extensions
Portable
No registration required
No Tracking
Built-in viewer
Works Offline
Dark Mode
Side-by-Side Comparison
Before/After photos
Screen Magnifier
Drag and Drop
Side-by-Side View
Image Comparison
File Comparison

Improve ImgSLI information

Developed by
Loganavter
Licensing
Open Source (GPL-3.0) and Free product.
Written in
Python
Alternatives
3 alternatives listed
Badge
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Supported Languages
- English
- Russian
- Chinese
- Portuguese

AlternativeTo Categories

File Management, OS & Utilities

GitHub repository

55 Stars
5 Forks
3 Open Issues
Updated Nov 4, 2026

View on GitHub

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Improve ImgSLI was added to AlternativeTo by Paul on Apr 13, 2025 and this page was last updated Apr 5, 2026.

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Install from the command line

flatpak install flathub io.github.Loganavter.Improve-ImgSLI

Be careful what you paste into a terminal. Check what a command installs before running it.

What is Improve ImgSLI?

Beyond visual comparison, it includes a built-in image analysis suite with pixel difference maps, SSIM/PSNR metrics, edge detection, and channel analysis. Comparisons can be exported as high-resolution images (PNG, JPG, WEBP) or video (H.265) via the built-in video editor with a keyframe timeline. Images load via drag & drop or clipboard paste (Ctrl+V).