Your keys stay in your wallet

Kasseal never sees your keys and never holds your funds.

The app builds each transaction and your wallet signs it. Your private key and seed phrase never leave the wallet.
Kasseal never asks for your seed phrase. Anyone who does is not Kasseal.
Every amount is shown before you approve: what you pay, what you get, fees and deposits, and the worst case at your slippage.
If a transaction’s network fee, as built, is noticeably higher than the review showed, the app stops before your wallet signs and asks you to approve the new figure or cancel.
Transactions are irreversible once accepted. Check the review sheet before approving.