From Bitcoin Wiki
CarbonWallet is a web based deterministic bitcoin wallet.
- No server side storage, private keys are generated from the passphrase and only exist in the memory of the browser.
- Deterministic key generation: Write down the passphrase generated for you and it's all you need.
- Transactions are signed locally in the browser: Your private keys are not shared with the server. You do not have to trust the server with your money.
- Privacy: No need to register a passphrase is all that is required.
- Public code hosted on Github which anyone can audit.