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LightCraft is an open-source Adobe Lightroom alternative in Rust
ArtCraft, the open-source team behind PhotoCraft and PdfCraft, released LightCraft, a Rust photo editor and library tool that reached 13,255 stars 16 days after the repository was created.
Image: GitHub
Why it mattersA Lightroom-shaped tool that an agent can drive through an MCP server removes the one-license-per-seat seat from a photo workflow. A marketing team that sends monthly product shots through a human editor can keep the look and run the pipeline itself.
A free photo library and raw editor that renders slider changes in four milliseconds on a 24 megapixel file is now the alternative that photographers and marketing teams on an Adobe Lightroom subscription did not have last month. LightCraft, the ninth app from the ArtCraft open-source team, is a Rust non-destructive photo editor that the project pitches as a clean-room reimplementation of Adobe Lightroom, with an opt-in MCP server for coding agents. The GitHub repository was created on 30 September 2026 and had 13,255 stars by 16 October.
LightCraft runs on macOS, Windows and Linux as a native app, and in the browser through WebAssembly. The source is on GitHub under Apache-2.0 or MIT, and the ArtCraft organisation on GitHub has 53,757 followers and 66 public repositories dating from January 2021. The project marks itself as alpha and says it is "young and moving fast".
What the project claims about coverage
The README quantifies the comparison with Lightroom in a set of numbers, all stated by the project. It says LightCraft is at "about 81% of Lightroom's full feature set" by count, with core features at 98%. For a day-to-day Lightroom replacement, it reports 61% overall, 51% for professional photographers, and 65% for casual users. Treat these as the project's own weighting: there is no agreed catalogue of Lightroom features to measure against, and the gaps for a pro, such as camera colour calibration and machine-learning masks, are listed openly.
How the pipeline is built
The processing pipeline runs in linear Rec.2020 float internally with Bradford white balance, uses OkLCh for colour grading, and renders on wgpu with GPU paths for Metal, Vulkan and DX12 plus a CPU fallback accurate to within one grey level. On an Apple M4 Pro, slider updates render in about 4 milliseconds on a 24 megapixel raw, a cold loupe render takes about 30 milliseconds, and a full export runs in about 0.3 seconds including parallel JPEG encoding. The library supports DNG, Canon CR2 and CR3, Sony ARW, Nikon NEF, Fujifilm RAF, Panasonic RW2, Leica RWL, Pentax PEF, Olympus ORF, plus JPEG, PNG, TIFF, WebP, PSD and JPEG XL. Compressed Olympus raws and some CR3 variants fall back to the embedded preview.
The MCP server and the CLI
LightCraft ships a command-line tool called lightcraft-cli that runs a developed sequence against an imported file and writes the result to a path. The example in the README is one line that imports a photo, sets exposure, and exports a JPEG. The MCP server is opt-in, runs headless or alongside the live app with a persistent library, and keeps every element in the user interface addressable by its name. The practical shape is that an agent operates the real interface the project ships, not a parallel API that drifts from it.
A marketing team that pays for Lightroom only for colour grading and batch export can run a product-shot pipeline through lightcraft-cli and the MCP server on its own files. The alpha label still matters for a professional photographer who relies on measured camera calibration or ML masking, and the project says so.
Source
storytold/lightcraft on GitHub, Apache-2.0 and MIT dual-licensed. The parent project is ArtCraft Crafting Apps.
This item was written by an AI system from the linked source. Reveneau is responsible for what it publishes.
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