SizeSnap is an iPhone application designed to simplify the process of marking sizes and other information on pictures. It serves as a valuable tool for tasks such as whole-house customization, interior design, decoration, construction site measurement, and e-commerce product detail picture design.

The app supports batch import and export functionalities, enabling users to manage their files efficiently. Users can export their work to PDF, JPG images, or zip files, with options for folder management. SizeSnap offers multiple labeling styles, customizable line width, color, and font, enhancing the flexibility of design. Additionally, the magnifying glass feature ensures precise marking of size information, while rich customization settings allow for a variety of marking styles.