Voice Calculator - Human speak is a free iPhone app developed by Junjie Ruan. It falls under the category of Business & Productivity, specifically in the Finance subcategory.

This app offers a unique feature of recording the calculation formula automatically, making it easy to find and refer to previous calculations. Users can also insert notes or segments to calculate financial data more easily. One of the standout features is the real voice broadcast of button numbers, which reports the results of the calculation in a clear and understandable manner.

The app is optimized for iPad, providing a high-definition calculator for a better user experience. Additionally, it offers a variety of tones, allowing users to switch the sound according to their preference. The app also includes multiple sets of high-definition skins, giving users the option to choose their own personalized style. Despite its rich features, the app maintains a small size, saving storage space on the device.

Overall, Voice Calculator - Human speak is a convenient and user-friendly app for those who need a voice-enabled calculator with additional finance-related features.