Astro Stacker vs RoboTou Stacker

Stack your night-sky photos into one cleaner, more detailed image, right on your iPhone or iPad. Astrophotography stacking combines many exposures of the same sky. Astro Stacker finds the stars in every frame, lines them up and combines them, so random noise falls away and faint stars, the Milky Way and deep-sky targets come through. HOW IT WORKS 1. Take several separate photos of the same patch of sky from a tripod or stable surface. 2. Import them from Photos or Files into a Deep Sky Studio project. 3. Pick a stack mode and tap Stack. 4. Finish the result with Auto Stretch, styles and colour tools, then save or export. THREE SIMPLE STACK MODES - Quick: averages every frame for a fast first look. - Quality (default): rejects outliers such as plane and satellite trails, and leaves out the weakest frames. - Max Detail: the slowest and most selective mode, with finer alignment. AUTOMATIC STAR ALIGNMENT Stars are detected and matched in every frame, with sub-pixel alignment and a quality check for each frame. Stacking needs clear stars in your photos to line them up. CALIBRATION FRAMES (PRO) Add darks, flats, dark-flats and bias frames to correct hot pixels, thermal noise, vignetting and dust. Astro Stacker sorts frames by file name and exposure, so files named "dark" or "flat" are picked up for you. FINISH IN THE SAME APP - Auto Stretch to bring faint signal into view - Gradient removal for light pollution and uneven skies - Local contrast, vibrance, levels and per-channel colour balance - Styles: Natural, Nebula Pop, Cosmic Drama and Scientific, each with a strength slider - Before-and-after comparison - Quick Enhance for a single photo you've already taken FILES IN AND OUT - Import: photos from your library on Free; camera RAW, Apple ProRAW and FITS on Pro - Export: JPG, PNG, TIFF and FITS, with 16-bit export on Pro ON-DEVICE Stacking and editing run on your iPhone or iPad. You don't need a computer, and your source frames are not uploaded to stack them. An optional account backs up finished results. FREE AND PRO Free: up to 10 light frames per stack, 3 stacks every 7 days and 3 saved results. Pro: unlimited frames and stacks, RAW, ProRAW and FITS import, calibration frames, 16-bit export and unlimited history. Choose monthly, annual or a one-time lifetime purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period, and you can manage them in your App Store account settings. GOOD TO KNOW - Moon, planet and solar stacking (Planet Lab) is coming soon. Today's stacking needs stars to align on. - Colour FITS files from one-shot-colour cameras are not debayered yet. - Star-trail stacking isn't supported, because every stack is aligned on the stars. Guides to capturing and stacking: https://astrostacker.co/guides Privacy Policy: https://astrostacker.co/privacy Terms of Use: https://astrostacker.co/terms Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Bring image stacking and AI star removal to your iPhone and iPad. RoboTou Stacker gives night-sky and landscape photographers practical tools for processing photos directly on their devices. Import images from Photos, Files, or a folder, choose a processing mode, preview the result, and save it back to Photos. Image processing runs locally, with no account registration or photo uploads required. CHOOSE YOUR WORKFLOW • Starry Sky Stack: Automatically generate a sky mask, align the stars, and process the sky and foreground separately. • Landscape Stack: Combine multiple photos of a static scene captured from a fixed position. • Star & Light Trails Stack: Use maximum-value stacking to combine star trails and vehicle light trails. • Star Trail Pro: Stack up to 100 images with a fade-enhanced workflow. • AI Star Removal: Process a single image on your device to create a starless image for further sky-background editing. OUTPUT YOUR WAY Choose a 4K or 1080p output preset while preserving the original aspect ratio. Smaller source images retain their original resolution. Both stacking and AI Star Removal follow your in-app resolution setting. MADE FOR YOUR DEVICE Switch between English and Chinese. Layouts optimized for the unfolded iPhone Duo display make better use of screen space across Home, mode selection, importing, and Settings. FREE FEATURES AND ROBOTOU PRO Landscape Stack and basic Star & Light Trails Stack are free. Starry Sky Stack, Star Trail Pro, and AI Star Removal require RoboTou Pro, available as an auto-renewing annual subscription or a one-time lifetime purchase. Manage or cancel subscriptions in your Apple ID settings. Privacy Policy: https://www.robotou.cn/robotou-stacker-ios-privacy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/