Open Source

Lumen is built on open source — and is open source itself. Below is the open-source software it ships with, and the license notices.

Lumen

MIT License © 2026 rescenedev

Lumen itself is MIT-licensed open source. Source code, issues, and contributions at github.com/rescenedev/lumen.

GRDB.swift

MIT License v6.29.3 · Gwendal Roué

A toolkit that makes SQLite feel at home in Swift. Lumen uses it to store photo metadata (favorites, labels, tags, albums) and the EXIF index. github.com/groue/GRDB.swift

Show full license 
Copyright (C) 2015-2024 Gwendal Roué

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

SQLite

Public Domain macOS system library

The most widely deployed embedded database in the world. Lumen uses the SQLite built into macOS, through GRDB. sqlite.org

Apple system frameworks

macOS SDK

Everything else is built on Apple frameworks that ship with macOS — SwiftUI & AppKit (interface), ImageIO & CoreImage (decoding, editing), PhotoKit (Apple Photos integration), MapKit (maps), QuickLook (previews), CryptoKit (cache keys), and more. The list above is the complete set of third-party code requiring a notice.