Annotium - Photo Annotation is a free Android application developed by Annotium Team, which focuses on technical fields. The app allows users to take notes and make illustrations on photos with high precision, track details, and share their work efficiently. With its numerous built-in tools, users can draw lines, curves, rectangles, ellipses, round rectangles, triangles, quadrangles, polygons, and many kinds of text such as plain text, callout (comic) text box, pointer text, spotlight, magnifier, text highlight, free draw, and icons.

One of the standout features of Annotium - Photo Annotation is its fully customizable shapes. Users can customize the shape with width, size, color, font, dash, arrow, and more. The app also offers comic dialog with callout text and extra text feature like zigzag text. Users can highlight a part of their photo with Spotlight, magnify small details with Loupe, and hide sensitive information with Blur. Additionally, the app has measuring tools for line segments or angles, and supports zoom and pan while editing. The app's user-friendly interface makes it easy to use, and it's a must-have tool for students, businessmen, construction workers, architects, maintenance workers, and all technical fields.