Cân Lúa V4 is a free Android app developed by Thiều Minh Luân. It falls under the category of Utilities and Tools and is designed to help farmers quickly and easily calculate the weight of their products without the need for pen and paper. The app allows users to calculate the weight of a variety of products, including rice, watermelon, vegetables, and fish.

Cân Lúa V4 automatically saves data once entered, making it easy for users to access and review past measurements. The app also provides users with the option to choose from several convenient input methods. It automatically calculates the total weight, deducts the weight of the packaging, and calculates the total cost, saving farmers time and effort. The app also allows users to export data to Excel or send it via email, Zalo, or Facebook. The app also features an automatic backup system to prevent accidental data loss.