MetaMask

MetaMask is a self-custodial crypto wallet available as a browser extension and a mobile app. It lets users hold tokens and NFTs, connect to decentralised applications, sign transactions and manage accounts across Ethereum and many other networks, while keeping control of their own private keys. For much of the history of Ethereum, MetaMask has been the default gateway to web3. Its browser extension made it possible to interact with decentralised exchanges, lending protocols, NFT marketplaces and games directly from a web browser, and most decentralised applications support connecting with it. It is developed by Consensys, one of the largest companies in the Ethereum ecosystem. Self-custody is the key concept. MetaMask does not hold users' funds; access depends on a secret recovery phrase that the user must back up. That gives users full ownership and control, but also full responsibility: losing the recovery phrase means losing access, and anyone who obtains it can take the funds. Phishing sites and malicious transaction requests are the most common risks, and MetaMask has added security alerts and transaction simulations to warn users about suspicious activity. The product has grown beyond a simple wallet. Built-in swaps and bridges let users trade tokens and move them between networks, portfolio views track assets across accounts, and staking features are integrated. Support has expanded beyond Ethereum-compatible networks to include other ecosystems such as Solana, and Snaps allow developers to extend MetaMask's capabilities. Hardware wallets such as Ledger and Trezor can be connected for extra security. The trade-offs include a learning curve for newcomers, the security responsibility inherent in self-custody, and fees on in-app swaps that are higher than using some exchanges directly. Alternatives include Rabby for a security-focused browser wallet; Phantom for a polished multi-chain wallet; Rainbow for a design-forward Ethereum wallet; Coinbase Wallet for users of Coinbase's ecosystem; Trust Wallet for broad multi-chain mobile support; and Ledger or Trezor hardware wallets for cold storage. Choose MetaMask when you want the most widely supported wallet for connecting to Ethereum-based applications.