Fortmatic is described as 'Build web3 dApps without extensions or downloads. Use one SDK to let users interact with your dApp through a beautiful user experience from any browser or device, including mobile browsers. Installs with a couple lines of code (compatible with web3)' and is an website in the Bitcoin & Cryptocurrency category. There are three alternatives to Fortmatic, not only websites but also apps for a variety of platforms, including Android, iPhone, SaaS and Brave. The best alternative is MetaMask, which is both free and Open Source. Other great sites and apps similar to Fortmatic are Torus (Free, Open Source) and BlockBank (Free).
Torus Wallet is the easiest blockchain digital wallet available on the web. Take advantage of social logins like Google, Facebook, Twitter, Discord, Reddit and Email to instantly and securely manage your private keys, cryptocurrencies, digital tokens and DeFi transactions.
BlockBank is a non-custodial utility wallet that combines the power of decentralized and centralized technology in a simple & secure mobile application. You can send, receive and store Bitcoin and crypto in a seamless manner while maintaining security and privacy.