Your mobile astrophotography darkroom
Astrophotography stacking combines multiple exposures of the same night sky. Astro Stacker aligns the frames, strengthens repeated light and reduces random noise so stars, skies, the Moon and planets come through more clearly. Import, calibrate, finish and export the result without moving the session to a computer.
Choose a sequence from Photos or Files. Free works with standard images; Pro adds RAW, Apple ProRAW and native FITS files captured with compatible cameras and telescopes.
Start with standard photos from an iPhone or iPad, or bring in higher-control camera and telescope files through Files on Pro.
Astro Stacker detects celestial detail and corrects movement between exposures before combining them.
Common stars are registered before the frames meet, so small shifts between otherwise matching exposures do not soften the stack.
Use matching calibration frames to correct thermal noise, hot pixels, vignetting, dust and sensor read noise.
Darks address thermal signal and hot pixels, flats address vignetting and dust, bias frames capture readout offset, and dark-flats calibrate flat exposures.
Use a quick average for an early look or choose an advanced method when trails, variable frame quality or faint detail demand more control.
Stacking strengthens detail that repeats across aligned frames while reducing random noise; no single method is best for every scene.
Begin with a purpose-built style, then refine the result with controls designed for astronomical images—not a generic filter dropped onto the dark.
Finishing happens after integration, with astronomy-focused styles plus tonal, colour, gradient and channel controls.
Compare the finished image against the original frame, inspect the result and choose the right format for sharing or further processing.
Compare before and after, save to Photos, then export JPG, PNG, TIFF or FITS; 16-bit exports are available on Pro.
Bring the right frames
Astro Stacker keeps the processing close to the images you already have, whether they started in Photos or came through Files.
Use standard images for quick, simple first stacks on Free.
Bring in higher-control files through Files when you want more latitude.
Import native FITS files through Files for a mobile processing workflow.
A complete pocket darkroom
Choose a burst, a sequence, or a set of camera and telescope frames.
Astro Stacker aligns, calibrates, combines and cleans every exposure.
Refine the result, compare the before and after, then export.
The field notes
Clear skies are only the beginning
