Rembrandt is a free, open-source alternative to subscription photo editors that runs locally on macOS, Windows and Linux with optional self-hosting. It emphasizes privacy and control - no account, no tracking, originals never altered - while performing heavy work on-device and on the GPU (Metal support on Apple silicon). Installers and a one-binary server let a machine host photos for browser access across a LAN; edits are stored as standard XMP files next to each image, and the updater verifies SHA-256 sums. Builds are provided but not code-signed yet, and an optional paid cloud sync service exists solely to sync edits and libraries between devices.
Functionally it aims to match and extend Lightroom-style workflows: RAW development for 1,000+ cameras, tone/colour/curves, Lensfun and camera lens profiles, masks (brush, gradient, colour/tone ranges, AI subject/background/object/depth), batch operations, albums, search and Lightroom import/export of metadata and virtual copies. AI-powered features run locally: natural-language "Ask" edits, touch painting to change local tones, Super Resolution 2×/4×, GPU Refocus (regularised deconvolution), AI Denoise producing DNG, HDR/panorama/focus merges, and background queued processing. Licensed GPL-3.0, the project includes build instructions and welcomes contributions.
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