Drop in a folder of frames. Satrelle locks onto the stars and builds your shot two ways: flowing star trails or a tack-sharp Milky Way. Every pixel is light you actually captured. No AI fill. No fake skies. No cloud.
Most stackers pick a lane. Satrelle gives you both signature looks from one folder. Flip between them in a click, same honest engine underneath.
Star Trails Classic arcs and comet-tail fades, continuous edge to edge. Where other tools leave dashed, broken lines, Satrelle keeps every trail smooth and unbroken.
Point Stack Satrelle lines up the sky so the stars stay sharp points, for clean, low-noise Milky Way and starry nightscapes. Satellites, planes and hot pixels are cleared automatically.
Reads your camera's RAW, straight from the card
Stack a night of frames in most tools and the tiny gaps between exposures show up as dashed, broken trails. Satrelle delivers clean, continuous starlight edge to edge, and clears satellite and airplane streaks at the same time. All from the light you actually shot.
Drag the slider to compare a 100% crop
No manual star-picking. No alignment spreadsheets. Satrelle lines up your whole sequence, hands you a clean master, and now takes it further: tune the look live, edit the foreground on its own, mirror the sky in water, and grade the result, all before it ever leaves the app.
Satrelle locks every frame to the night sky on its own, even wide 14 mm nightscapes. No reference stars to click, no drift to chase, nothing to set up.
Keep your landscape tack-sharp while only the sky builds up. Clean, natural edges every time.
Mirror your finished trails into a lake or still water. Physically, not faked. Satrelle reflects the sky to match your shot, so the reflection lines up the way real ones do. An interactive editor lets you set the waterline, paint the water, and dial in depth fade, ripple blur and blend mode. It reflects the sky only, so trees and ridges never double up.
A multi-frame blend of your foreground removes noise, satellites, and even the real smeared star reflections off water, giving a pristine base before you add your own.
A Lightroom-style panel for the land alone: exposure, contrast, highlights and shadows, color and clarity, applied only under your mask with a live preview. The skyline stays a clean, seamless blend, and Satrelle warns you if the land ends up brighter than the night sky, the tell-tale sign of a fake-looking composite.
Keep shaping the image after the run: grade, smoothing, polish, thickness and comet fade update the on-screen result in about a second, so you find your look without waiting on full re-runs.
Thin-sky shot giving you trouble? Set your location and the direction you faced on a built-in offline map, and Satrelle handles the rest.
Reveal fainter trails, recover star color, warm or cool the sky, add contrast, and darken the zenith with a natural sky gradient, all sky-only, so your foreground stays put. Blend in a separate lit foreground exposure too.
A half-resolution draft of the whole result in seconds, so you dial in your look before committing to a full run.
See your sequence as a grid. Satrelle auto-flags headlights, planes, clouds and stray darks so you exclude them in one click.
Full speed for the fastest run, or pick Balanced or Quiet to cap the CPU cores and keep your Mac cool, quiet and responsive while it works.
Sensor hot pixels are cleaned up automatically; add optional dark frames for an even cleaner sky.
Export a 16-bit TIFF with an embedded Adobe RGB (1998) profile, so your master opens with correct, vivid color instead of a washed-out import. Optionally, save a timelapse of the trails building across the sky.
Save your favorite looks as presets, then queue multiple folders to run back-to-back, or schedule the queue overnight while your Mac stays awake.
Satrelle never guesses. Nothing is upscaled, invented, or pulled from a stock library. It builds your image only from the light you actually recorded, then leaves the vision entirely to you.
Intentionally simple. Point it at the sequence, pick the look, and export a file built for serious finishing.
01/ 05 Keep the night's frames in one folder and point Satrelle at it. RAW, TIFF or JPEG.
Scan the grid and drop the frames with planes, headlights or clouds, auto-flagged for you.
Star Trails or Point Stack. Load a preset, or dial in thickness, comet fade, bloom and more.
Check a fast half-res draft, then run the full master while you watch it build.
Polish the sky with the finishing & grade controls, brighten the foreground on its own, and mirror it all into water if you shot a lake, then export a 16-bit Adobe RGB TIFF (plus an optional timelapse) for the editor you trust.
Plan the shot before you drive out, and work out what went wrong after. All free, all in your browser or on your phone.
Europe's first total solar eclipse since 1999, and the Perseids peak the same night under a new moon. Path, local times, and why the Spanish sunset decides most photographs. Tambien en espanol.
Shooting it with a camera? The new Eclipse Add-On merges your totality brackets into one HDR master, right here in Satrelle on your Mac.
Maximum exposure by the 500 and NPF rules, how far your stars will trail, and the arc your session will draw. Drop in a photo and see the trails rendered over your own frame.
Planning, capture settings, the honest Mac software landscape, and fixes for the four failures that ruin most stacks: dashed trails, doubled trails, blown foregrounds and aircraft.
One app, one optional upgrade. Your 7-day trial unlocks everything. After that, keep stacking for free up to 200 frames per image, or go Pro once for the full finishing toolkit and unlimited frames.
Yours to keep after the trial: up to 200 frames per image, forever. No credit card.
Everything in Free, with no frame limit, plus the tools for a finished, gallery-ready sky:
Take Satrelle out for seven nights with every feature unlocked. No credit card. Love it? Own it forever for one price. No subscription, not now, not ever.
The complete night-sky stacker. Every mode, every tool, no limits.
macOS 11 Big Sur or later · Apple Silicon
Shot a total solar eclipse? Merge your RAW totality brackets into one HDR master and bring out the corona, 100% classically, no AI. Unlocks the Eclipse tab with one pasted key.
Add-on for the Satrelle macOS app · Apple Silicon · Offline after activation
Activate once, then process anywhere, even with no internet in the field. Licenses re-validate every 30 days with a 30-day offline grace period, so a weekend in the backcountry is never a problem.
Astrophotography deserves restraint: process the data you captured, preserve the truth of the night, and leave the creative finish to the photographer.
Protecting the night sky starts with how we capture and share it. Satrelle supports truthful presentation. No generated additions, no synthetic sky replacement.
Two stacking modes in, a photographer-controlled master out. Here's what that means.
Your frames, your vision, your grade, with a tool built for the sky you actually shot. Seven nights free.
Have a question about Satrelle before you try it? Send us a note and we'll reply by email.