ONUS is a free app developed by VNDC LTD, available on the iPhone platform. It falls under the category of Business and Productivity and specifically under the subcategory of Finance. The app is designed to make trading and investment in Bitcoin, Ethereum, and over 200 other digital assets easy for users.

One of the unique features of ONUS is that it offers a 12% annual interest rate on unlimited savings. The app also provides several opportunities for users to earn free cryptocurrencies, including receiving free crypto when opening an account, after each trade, and by referring friends to the app.

Overall, ONUS seems to be a promising app for those looking to trade and invest in cryptocurrencies. The app's user interface is easy to navigate, and the free trading and investment opportunities make it an attractive option for beginners and experienced traders alike.