Rabby, built by DeBank and launched in 2022, is an open-source EVM wallet aimed at active DeFi users, with a pre-transaction simulation feature that previews a transaction's effect before you sign, and automatic chain-switching across EVM networks. It is a self-custody hot wallet — keys are encrypted on-device. We have not completed a hands-on test and publish no rating until confirmed against current facts.
Transaction simulation and chain switching
Rabby's headline feature is pre-signing simulation: before you approve a transaction, Rabby shows you a preview of its actual on-chain effect (what balances and approvals will change) so you are less likely to blind-sign something malicious — a meaningful safety improvement over wallets that show only the raw transaction data. It also automatically detects and switches to the correct EVM chain per dApp, removing a common MetaMask friction point of manually switching networks.
Custody and security model
Rabby is self-custody and fully open-source, meaning its code is publicly auditable, which is a genuine differentiator versus closed-source competitors like Exodus or Phantom. As a hot wallet, it still stores keys in encrypted software rather than a dedicated secure-element chip, so the usual device-hygiene caveats apply, and its simulation feature — while valuable — is a mitigation, not a guarantee against every attack.
Scope and everyday use
Rabby is EVM-focused (it does not natively support non-EVM chains like Solana or Bitcoin) and is available as a browser extension and mobile app. Staking is available only via connected dApps, not as a native in-wallet feature. It is free to use, with network gas fees applying as normal.
Strengths & limitations
Strengths
- Pre-transaction simulation previews a transaction's real on-chain effect before you sign — a genuine phishing/scam mitigation.
- Automatic EVM chain detection and switching removes a common multi-network friction point.
- Fully open-source and self-custody.
Limitations
- EVM-only — no native support for non-EVM chains like Solana or Bitcoin.
- No dedicated secure element; simulation reduces but does not eliminate hot-wallet risk.
- Staking is only via connected dApps, not a native in-wallet feature.
Frequently asked questions
What makes Rabby different from MetaMask?
Its pre-transaction simulation feature, which previews the actual on-chain effect of a transaction before you sign, and automatic chain-switching across EVM networks — both aimed at reducing phishing and misclick risk.
Does Rabby support Solana or Bitcoin?
No, Rabby is EVM-focused and does not natively support non-EVM chains.
Is Rabby open-source?
Yes, Rabby is fully open-source, which is one of its stated differentiators versus closed-source hot wallets.