Manifolio is a free Chrome extension developed by Will Howard. It falls under the category of Browsers and specifically belongs to the Add-ons & Tools subcategory. The main purpose of this extension is to provide a bet size calculator for Manifold Markets.

With Manifolio, users can easily calculate the optimal bet size for YES/NO questions on Manifold Markets based on a given probability. It utilizes the well-known Kelly criterion to determine the ideal bet amount. By using this extension, users can save time and effort as it conveniently pre-fills the URL of the market, eliminating the need to switch tabs.

Overall, Manifolio is a straightforward and useful tool for those who engage in betting on Manifold Markets. It simplifies the process of calculating bet sizes and enhances the overall user experience.