Metamask is required for using the Hatch dApp.
Metamask describes itself as a "bridge that allows you to visit the distributed web of tomorrow in your browser today." Metamask is a browser extension that is both an Ethereum wallet and a Web3.0 provider. That means that you can interact with dApps right from your browser, just like you are interacting with regular web sites. It's a light wallet, which means it doesn't need to be fully synchronized with the Ethereum network to function. Extension is supported in Chrome, Firefox, Opera and the Brave browser.