Adobe Lightroom Classic 15.6.0 — Mac version

The catalogue backs up as a single folder and every preview takes up space—expect around 30 GB just for previews if you let them pile up. Questions usually start there.

Common things people check

• Does it need Adobe's servers? Not for an offline setup.
• Will it merge a ten-shot panorama? Yes, and HDR brackets too.
• Is an account required? Not with the all-in-one installer.
• What macOS version is the cutoff? macOS 14 or later.

Why it stays on the desktop

This is the app that used to be called plain Lightroom, now renamed and kept fully desktop-focused. Import speeds, preview generation and brush work all benefit from local hardware. You manage your own folders and catalogues—no cloud sync, no browser version. If you need the photos to stay under your own roof, that is the point.

Capture One feels closest, but Lightroom Classic holds the repair-café edge

People at the repair café often ask what else does the same job. Usually they have heard of Capture One or RawTherapee and want to know how Lightroom Classic sits alongside them.

Capture One is the closest rival in feel. Its raw processing can pull slightly cleaner detail from some Fujifilm and Phase One files, and its colour editor is deeper in a few ways. But Capture One has no equivalent to Lightroom Classic's catalogue—you work in sessions or a single catalogue, and searching across years of folders isn't as fluid. Lightroom Classic's smart collections and keyword hierarchy suit someone with ten years of unsorted folders better. On older Intel Macs, Capture One's GPU acceleration sometimes stumbles where Lightroom Classic stays steady.

RawTherapee does a lot for free. Its demosaicing tools are genuinely good, and the wavelets-based sharpening gives a different kind of detail extraction. The trade-off is speed and interface. RawTherapee is a single-image editor with a file browser bolted on—there is no catalogue to speak of. Culling a wedding shoot of 2000 frames inside RawTherapee feels like fighting the app. Lightroom Classic was built for that volume.

Apple Photos is what many Mac users already have. It edits, it organises, and it syncs. The gap is in local control and masking precision. Photos cannot do luminance-range masks, cannot merge to HDR with the same control, and its raw conversion leans on Apple's engine, which gives fewer sliders. If you want your library to live entirely on an external SSD and never touch iCloud, Lightroom Classic is the more direct path.

Turn on auto-advance so a rating key moves you to the next shot

Some of the most useful bits hide in plain sight. These are things volunteers point out to new users after a couple of sessions.

• Auto-advance with a key. Turn on Photo > Auto Advance and after you rate or flag an image, the filmstrip moves to the next frame. No mouse click needed. Culling becomes a one-handed rhythm of arrow keys and number keys.
• Solo mode in the panels. Right-click any panel header in the Develop module and choose Solo Mode. Only one section stays open at a time. No more endless scrolling past the Colour Grading panel to reach Calibration.
• Visualise Spots on import. Before you start cloning dust marks, tap the A key in Develop to toggle the spot-visualisation overlay. It inverts the image and highlights sensor spots you would never notice otherwise.
• Virtual copies cost nothing. Right-click an image and pick Create Virtual Copy. You get a second set of edits without duplicating the raw file. Useful for trying a black-and-white version alongside the colour edit.
• Shift-double-click resets a slider. In Develop, hold Shift and double-click any slider label like Exposure or Highlights. It snaps back to zero instantly—faster than dragging.

Build your catalogue structure now before the Library module gets sluggish

A fresh install means a clean catalogue. How you set it up in the first few hours determines whether it stays fast later. These are the things the bike-library volunteers tell friends who have just got the app running.

1. Pick a catalogue location now. The default often drops the catalogue inside your Pictures folder. If you want all your work on an external drive, create the catalogue there from the start. Moving it later is fiddly and sometimes breaks folder links.
2. Set preview size to match your screen. In Catalog Settings > File Handling, choose Standard Preview size close to your display resolution. Auto is fine, but setting it manually stops the app building previews larger than you need. A 13-inch MacBook Air does not need 2880-pixel previews.
3. Turn off address lookup in Map. Unless you geotag everything with GPS data, the Map module does little and still sometimes tries to contact a server. Right-click the module picker and hide it—one less distraction.
4. Decide on a folder structure and stick with it. Some people like year/month/day folders. Others prefer project names. Lightroom Classic will follow whatever you set up on disk, but import presets save you from rebuilding the same hierarchy each time. Set one up during your first import.
5. Ignore the cloud icons. Lightroom Classic is not Lightroom (the cloud one). Any prompt about syncing refers to a feature that expects a Creative Cloud login. If you are running offline, it simply won't apply.

Small things like these keep the catalogue snappy and the workspace calm. The app rewards a bit of setup time before you feed it a full photo collection.

Adobe Lightroom Classic 15.6.0 ships the latest bug fixes and low-key improvements for a steadier editing experience.

• macOS 14 or later
• Apple Silicon or Intel 64-bit Mac