Planner for Hay Day, developed by STM Tech., is a free utility app available on Android. This app allows users to plan their production in the popular farming game, Hay Day. With this app, users can avoid spoiling their products and plan to produce only what they need. The app also helps users keep their barn and silo clean and clear.

The app offers several features, including the ability to save the number of existing products for the next plan and an auto-filter for items needed in the production line. Additionally, the app estimates the time for each producing recipe and allows users to specify the number of products they need to produce. The interface is user-friendly and easy to navigate.

Overall, Planner for Hay Day is a useful tool for Hay Day players who want to optimize their production and avoid wasting resources. It is free and available for download on the Google Play Store.