Software · Photo & graphics

Improve ImgSLI

Image comparison with advanced magnifiers.

Completely free
Linux
Open source

At a glance

All of Improve ImgSLI is free: no feature is locked behind a paid plan, and its code is open.

Its licence (MIT) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

Open source code
Commercial use allowed

About

Improve ImgSLI is an open-source image comparison tool focused on precise visual inspection, responsive interaction, and advanced canvas rendering workflows. It is designed for artists, photographers, retouchers, AI upscaling workflows, quality control, and anyone who needs to compare images at pixel level without losing context. Key features include: Compare images with a movable horizontal or vertical split line, including zooming and panning in the main canvas. Use one or more synchronized magnifiers with adjustable capture areas, display sizes, freeze mode, combined layouts, internal split, per-instance colors, and keyboard-assisted positioning. Load and manage multiple images per side with drag-and-drop, list switching, swapping, and direct filename editing. Inspect visual differences with rendering-aware preview controls and selectable interpolation modes. Export full-resolution comparison images with overlays, labels, and comparison state preserved. Edit recorded comparison sessions in the built-in video editor with timeline selection, trimming, preview playback, and export. Use a feature-contract based canvas architecture that keeps overlays, magnifiers, guide lines, settings, and export behavior synchronized. Use persistent settings, multilingual interface support, and structured diagnostics for advanced troubleshooting. The application is distributed under the MIT License.

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Flathub (credit card, publisher, licence, free status, platforms, commercial use, version) — 9 November 2026
Last technical check: 8 November 2026
Description from Flathub — AppStream (Flathub)

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