An honest look. There isn't one "best" stacker, there's the one that fits how you shoot and how you like to edit. Below is a fair roundup of the main options, ours included, and who each one suits.
"Best" depends entirely on what you photograph and how hands-on you want to be. A deep-sky imager stacking two hours of a nebula has different needs from a photographer who wants a clean Milky Way over a landscape by breakfast. The table below compares them, then there's a short, fair profile of each. For a full feature-by-feature comparison against the landscape-astro field, see the comparison page.
| Software | Platform | Price | Landscape-optimized | Integrated finish | Learning curve |
|---|---|---|---|---|---|
| DeepSkyStacker | Windows | Free | ✗ deep-sky | ✗ | medium |
| Sequator | Windows | Free | ✓ | ✗ | low |
| Siril | Win/Mac/Linux | Free | ✗ deep-sky | partial | high |
| Starry Landscape Stacker | macOS | ~$40 | ✓ | ✗ | low |
| PixInsight | Win/Mac/Linux | ~$323 | ✗ deep-sky | ✓ | very high |
| NightScape Lab | macOS & Windows · in Photoshop | $129 once | ✓ | ✓ | low |
The venerable free workhorse of deep-sky stacking on Windows. It handles lights, darks, flats, and bias frames with serious calibration options and has stacked more nebulae than anything else on this list. It's built for the telescope-and-tracker crowd, not for landscapes. There's no foreground handling and no finishing. Best for: Windows deep-sky imagers who want proven, free calibration and stacking. See the full NightScape Lab vs DeepSkyStacker comparison →
A free Windows favorite for nightscapes specifically. It's fast, friendly, and genuinely good at aligning a starry sky over a fixed foreground with minimal fuss: a superb one-click entry point for landscape astro. It stacks; it doesn't finish, so color, gradients, and stars are still on you afterward. Best for: Windows photographers who want a free, quick, no-friction nightscape stack. See the full NightScape Lab vs Sequator comparison →
A powerful, free, cross-platform astro suite that does far more than stack: calibration, registration, background extraction, color calibration, and scriptable processing. Its white-balance and gradient approaches are excellent and well respected. The trade-off is a steep learning curve aimed at deep-sky work rather than landscapes. Best for: patient enthusiasts who want deep-sky power for free and don't mind the ramp. See the full NightScape Lab vs Siril comparison →
The mature, excellent one-click nightscape stacker on macOS. It's fast, reliable, and beloved for a reason: point it at your frames and it produces a clean stacked sky over a sharp foreground with almost no decisions to make. It's a stacker, not a finisher, and its output file is designed for its own workflow rather than for hand-editing in Photoshop. Best for: Mac shooters who want the "stack it, done, don't touch it" experience. See the full NightScape Lab vs Starry Landscape Stacker comparison →
The deep-sky powerhouse. If you're chasing faint galaxies and want total control over every stage of calibration and processing, nothing here matches its depth. That power comes with a price tag and a famously steep learning curve, and it's overkill (and not landscape-oriented) for a Milky Way over a ridge. Best for: serious deep-sky imagers who want maximum control and will invest the time. See the full NightScape Lab vs PixInsight comparison →
Ours, and we'll be straight about where it fits. NightScape Lab ($129 one-time) lives inside Photoshop and does landscape-optimized dual-stream stacking and the core nightscape finish (white balance, defringe, star removal/reduction, and the color-matched Foreground Sky Merge) on a clean 16-bit linear base image. It also closes the loop with Lightroom Classic: select a night's frames, choose Stack in NightScape, and the engine auto-detects lights and darks, stacks, imports the base image back into your catalog, and opens it in Photoshop. The AI sky mask arrives as an editable layer you can paint and restack with, and Star Trails with five looks is built in. On the raw stacking metrics against a good one-click stacker the margins are modest; we'd rather claim "as good or a little better, and the right deliverable." The real point is the combination: stack and finish in one tool inside Photoshop, keeping a clean linear base image, without exporting to a separate app. It runs on macOS and Windows (Photoshop 2023+, Lightroom Classic).
Best for: the hands-on landscape astrophotographer, on Mac or Windows, who already edits in Photoshop (with or without Lightroom Classic) and wants to stay there, keeping control from RAW to final composite.
How to choose: If you want free and one-click, Sequator (Windows) or Starry Landscape Stacker (Mac) are excellent. If you're a deep-sky imager, DeepSkyStacker, Siril, or PixInsight are your world. If you want to stack and finish a nightscape inside Photoshop and Lightroom Classic on a clean linear base image, on macOS or Windows, that's the gap NightScape Lab fills.
If the "stack and finish, all in Photoshop" workflow is what you've been missing, NightScape Lab is a one-time purchase: no subscription, no trial to cancel. The demos and before/after crops on this site are the trial.
30-day money-back guarantee. If it's not for you, email for a full refund, no questions asked.