RoboTou Stacker

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/