Planimeter is a free iPhone application developed by 忠 张. It falls under the category of Utilities & Tools and is a useful tool for measuring distance and area on maps. With Planimeter, users can measure anything visible on satellite maps, including lawns, fences, farms, roads, and roofs.

The app offers several features to enhance the measuring experience. It supports measuring distance and area, allowing users to measure as a path, polygon, star, or circle. Multiple areas can be measured simultaneously, and the app provides a visual records list for easy saving and sharing. Users can choose between Apple Maps and Google Maps for their measurements and can easily locate places using search or GPS. Planimeter supports various length and area units, including custom units. Users can also customize the fill color, board color, and text for their measurements. Additionally, the app supports live record by GPS.

Please note that continued use of GPS running in the background can significantly decrease battery life.