Coldly is a free crypto wallet for Windows. Plug in your paired USB and enter your password to sign. Pull it out and signing locks, while your balances stay on screen.
ColdlyHold ETH on Ethereum, use apps on Base, keep tokens on Arbitrum. Pick a network to see its assets, its native currency and where you are sending from, right inside Send and Receive.
Ethereum
Base
Arbitrum One
OP Mainnet
Polygon
BNB Smart Chain
Avalanche
Linea
Scroll
Gnosis
Blast
Mantle
Celo
zkSync EraHome brings together your balance, assets, protection status and recent activity. Assets are identified by network and contract address, not by ticker. When a price is missing, Coldly says so instead of guessing.
Name accounts for everyday use, a project or anything else. They all come from the same phrase, and you can switch while signing is locked.
Paste a contract address and Coldly reads its name, symbol and decimals. Removing a token only stops Coldly watching it.
Coldly prepares every transaction for review first: sender, network, recipient, asset, amount and estimated fee. Its checks bring possible problems into view. They support your review; they do not promise every address or contract is safe.
Tokens sent here can never be recovered.
Your active account's address and QR code, next to the network the sender should use. Switch networks right there.
Inspect supported token allowances left over from apps you used, and prepare revocations.
Transactions for the selected account, with confirmation status and links to the explorer.
The Coldly iPhone app is a read-only window onto your wallet. It shows what you hold and cannot spend. Pair it once from Settings on your computer, then it reads the chain itself, even with your PC switched off.
Any ordinary USB drive becomes the second key to your wallet's signing.
Set your password and Coldly creates your wallet and first account.
Write down your recovery phrase and confirm it. It is the foundation of recovery.
Your recovery phrase rebuilds the wallet with a new USB and password. The USB is for everyday access; the phrase is what recovers your accounts, so keep it safe. You can revisit the setup guidance any time inside the app.
The USB holds unlock material, not your coins. Your assets stay on their blockchains and signing happens on your computer. Coldly is a software wallet with a USB lock, not a hardware wallet. It does not turn a USB drive into secure signing hardware. It gives your wallet a physical step you can see and feel.
The short version: your USB unlocks signing, your recovery phrase recovers your wallet, and your coins never leave their blockchains.
No. Coldly is a software wallet with USB-gated access. The USB holds unlock material, and transaction signing happens on your computer. It does not turn a USB drive into secure signing hardware; it adds a physical step before you can sign.
No. Your assets stay on their blockchains. The USB is a second key to your wallet's signing access, not a place where coins are kept.
Your recovery phrase rebuilds the wallet with a new USB and password. That is why protecting the phrase matters: the USB is for everyday access, the phrase is what recovers your accounts.
No. They flag things like burn-address recipients, first-time recipients, unlimited approvals and certain suspicious contract interactions, and they check the node's chain ID. They support your review; they cannot guarantee an address, token or contract is safe.
Coldly is free. It runs on Windows.
Plug in. Unlock. Review. Sign. Unplug.
Free for Windows.