CTDroid is a free coordinate transformation tool designed for Sri Lanka. It allows users to access location information from their device GPS sensor or any other location provider and convert WGS84 latitude, longitude, and height values into Sri Lanka National grid coordinates adhering to SLD99 or KANDAWALA datums. This app is particularly useful for surveyors, engineers, and anyone else who needs to convert coordinates in Sri Lanka.

One of the standout features of CTDroid is that transformation parameters are configurable, which means users can customize the app to their specific needs. Additionally, the app supports saving and exporting coordinates, and back projection is supported via an inbuilt coordinate converter. Overall, CTDroid is a reliable and efficient tool for anyone who needs to convert coordinates in Sri Lanka.