Concrete Design by LetsConstruct is a free Android app that is designed to assist civil engineers in determining the amount of reinforcement in a concrete section for preliminary design. This app is an excellent tool for engineers who are looking for a quick and easy way to check reinforcement, compression zone, and cracking in their designs.

One of the standout features of Concrete Design is its ability to work with both metric and US units. Additionally, the app is integrated with the Beam Design app, making it an even more powerful tool for engineers. However, non-pro users may experience Google ads, which require an internet connection and access network state. This app requires SDCard storage to be able to send an image by email.

Overall, Concrete Design is a useful app for civil engineers who need to quickly and easily check reinforcement, compression zone, and cracking in their concrete designs. Its integration with the Beam Design app and the ability to work with both metric and US units make it a versatile tool for engineers.