Compositor: Open-Source macOS Image Editor Built as a Photoshop Alternative

Repositoryrobbietilton/CompositorTool

Compositor is a free and open-source image editor for macOS tailored around familiar Photoshop workflows for compositing and post-processing.

Key points

  1. Native macOS application written in Swift under the permissive MIT license.
  2. Addresses high Adobe subscription costs and the unfamiliar workflow of alternatives like GIMP.
  3. Provides comprehensive layer support with folders, Photoshop-standard blend modes, layer masks, clipping masks, and GPU-rendered effects.
  4. Includes adjustment layers, non-destructive transformations, and selection tools with Content-Aware Fill.
  5. Features painting and retouching capabilities including brushes, clone stamp, and spot healing.
  6. Distributed via direct download, Xcode source builds, and Homebrew Cask.

Why it matters

Many macOS creators and developers want a native, subscription-free alternative to Photoshop that keeps identical mental models and shortcuts. Compositor delivers an open-source option specifically optimized for Apple hardware.

Analysis

Compositor addresses users seeking a drop-in replacement for Photoshop's core compositing features without re-learning interface paradigms. With over 6,000 GitHub stars and extensive tool coverage, the project demonstrates solid maturity as a native macOS utility.

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Summary generated by AI (Gemini 3.8 Flash, 29 September 2026). It may contain errors – the original source is authoritative.

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Locations

  • Mattersburg
    Johann Nepomuk Bergerstraße 7/2/14
    7210 Mattersburg, Austria
  • Vienna
    Ungargasse 64-66/3/404
    1030 Wien, Austria

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