Handy Leveler is a free spirit level app developed by Tossy, available on Android. It allows users to check the horizontal and vertical levels of any surface with their smartphone. The app features bubbles and numerical values unique to smartphones, making it easy to read. Users can switch between ruler display and mark display depending on their preference and adjust the appearance by changing the color.

The app can measure angles up to 90 degrees, allowing users to check both horizontal and vertical angles. It also offers the option to display or hide numerical values and switch between bubble and mark display. The range of viewing angles is adjustable, and the measurement result can be saved for later use. In addition, users can change the color of the mark and text to their liking.

Overall, Handy Leveler is a convenient and user-friendly app for anyone who needs to check the level of a surface. It's perfect for DIY enthusiasts, carpenters, and anyone who needs to make sure their work is level.