Koutuxia
1.9 is out · iPhone and iPad

On-device image workspace

Cleaner edges. Product photos, finished in one place.

Lift the subject automatically, then finish the details with full-resolution Smart Edges, Fix Background and a precise refine brush. Transparent cutouts, white backgrounds and square product shots stay in one workflow.

Free · No account · No ads · Requires iOS / iPadOS 17 or later

  • Full-resolution export
  • Batches up to 9
  • On-device processing
Koutuxia on iPhone: a black dog cut out against a transparent checkerboard, with background color swatches and a save button below

New in 1.9

Fix Background

Export

Full-resolution edges

Version 1.9

A second way through difficult edges

Automatic detection is only the start. Version 1.9 gives you control over edge detail and leftover background while keeping the product-photo and batch workflow intact.

01New in 1.9

Full-resolution Smart Edges

At export, the mask follows detail in the original photo for closer hair, fur and outline alignment.

02New in 1.9

Tap to fix the background

When detection leaves background behind, tap the area to clear it; separated areas of the same colour can be fixed with another tap.

03

Refine what you actually export

Erase and restore strokes stay final, with a magnifier, undo, redo and Restore Automatic Edges when you want to start again.

04

Lay out a product shot

Set a white background, square canvas, subject size and position, edge treatment and shadow, with square exports from 800 to 1600 pixels.

05

Process up to 9 at once

Apply one background, size, format, placement and shadow to a batch; stop, resume and retry only the items that fail.

06

Transparent PNG or JPG

PNG keeps transparency and JPG fills an effective background. Save to Photos or send the result through the system share sheet.

iOS on-device app

Image processing stays on the device

The iOS app uses Apple’s native image frameworks on the device, with no account or image upload required, and it works in Airplane Mode. The website’s Pro cloud mode is a separate processing path.

Web version

On a computer, choose the path that fits

The web version’s free mode runs locally in the browser. For difficult edges, Pro cloud mode sends the image to Replicate for higher-precision processing. Both are separate from the on-device iOS app.

Open the web version
iOS app
Apple frameworks · on-device processing
Web free mode
Local browser model · no upload to this site
Web Pro mode
Replicate cloud processing · for difficult edges

Available in the US, Japan, Hong Kong, Taiwan and most other supported App Store regions; not currently available in the mainland China store.