The gratuity calculator app is a mobile application that enables users to calculate their gratuity amount easily and quickly. The app typically requires users to input their basic salary, duration of employment, and other relevant details and then generates an estimated gratuity amount based on applicable laws and regulations. Overall, these apps provide employees with a convenient and user-friendly way to estimate their gratuity entitlements and plan for their financial future. Additionally, it assists HR teams in streamlining their processes and reducing their workload.