Rabby is an open-source, self-custody software wallet for Ethereum and EVM-compatible chains, built around making each transaction safer to sign. It comes from the team behind DeBank, the DeFi portfolio tracker, and that origin shows: Rabby is aimed at people who interact with on-chain apps often and want to understand what a transaction will do before they approve it. It is a hot wallet, with keys held on the user's own device.
Custody rests with the user. Rabby is non-custodial, so the holder controls the private keys, and the wallet does not hold funds on anyone's behalf. As with any self-custody wallet, the recovery phrase is the single point of control and the single point of failure, and protecting it is on the user.
The feature that sets Rabby apart is what it shows you before you sign. Rabby simulates a transaction first and gives a clear preview of the balance changes it will cause, so you can see what is about to leave or enter the wallet rather than approving a request you cannot read. Alongside that, it runs risk scanning on every transaction, flagging the address or contract you are about to deal with. The aim is to catch the approvals and signature requests that drain wallets, by showing the outcome in plain terms at the moment of signing.
Rabby is multichain by design and built for moving between EVM networks without friction. It supports Ethereum and a wide range of EVM-compatible chains, and it automatically detects which chain a connected app is using, switching the wallet to the matching network on its own. That removes the manual chain-switching step that trips people up in other multichain wallets, where connecting to an app on the wrong network is a common mistake.
It is delivered mainly as a browser extension for Chrome and other Chromium-based browsers, with desktop and mobile versions available as well. The wallet is open source, which lets anyone inspect the code behind the safety features rather than taking them on trust. For active DeFi users who sign many transactions and want a check on each one, Rabby is known specifically for that pre-sign visibility; for someone who only holds a coin or two and rarely transacts, the safety tooling matters less and a simpler wallet may be enough.