Ninimaths is an iPhone application developed by Ninicode Inc. It is designed to help users improve their mental arithmetic abilities through various modes of calculation. The app is available for free and falls under the category of Education & Reference.

With Ninimaths, users can choose from five different modes of calculation, including addition, subtraction, multiplication, division, and a mixed mode. This allows users to focus on specific areas or practice a combination of different operations. The app also allows users to freely combine numbers ranging from 1 to 5 digits, providing a customizable learning experience.

One of the standout features of Ninimaths is its ability to display calculations in column format. This format is commonly used in schools and helps users visualize the calculations more effectively. Additionally, the app records daily scores for each mode and displays them on a graph, allowing users to track their progress over time.

Ninimaths also includes a ranking function by Game Center, which adds a competitive element to the learning experience. Users can compare their scores with others and strive to improve their rankings. The app also offers a time trial mode, which measures the user's performance under strict time constraints.

Overall, Ninimaths is a valuable tool for anyone looking to enhance their mental arithmetic skills. Its range of calculation modes, customizable number combinations, and visual display make it an engaging and effective learning app.