Keystone 3 Pro
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Keystone 3 Pro brings a 4-inch touchscreen and a removable 1200mAh battery to the air-gapped wallet category, making it the most approachable offline signing device available.
A-Best Air-Gap with Modern UX
Keystone 3 Pro brings a 4-inch touchscreen and a removable 1200mAh battery to the air-gapped wallet category, making it the most approachable offline signing device available. It integrates natively with MetaMask, OKX Wallet, and Solflare via QR-based WalletConnect, covering Ethereum DeFi, Solana, and Bitcoin in a single device. The open-source firmware and fingerprint sensor add meaningful security layers without requiring a terminal or manual hash verification.
Pros
- 4-inch touchscreen with battery — the best air-gap UX available
- Native MetaMask and Solflare QR integration for DeFi and Solana
- Open-source firmware with fingerprint authentication
Cons
- Battery adds bulk compared to USB-only devices
- Smaller community and third-party integration ecosystem than Ledger or Trezor
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