The best alternatives to Serenity Shield

Coinkite Tapsigner is an NFC-powered Bitcoin hardware wallet in a credit card form factor. The private key is generated inside the card and never leaves it — transactions are signed by tapping the card on an NFC-enabled phone. It works with Nunchuk, Sparrow, Bitcoin Keeper, and Cove wallets for mobile and desktop.

Carta Wallet is an NFC-powered cold wallet in a card form factor that keeps private keys stored offline on enterprise-grade NXP smart chips. With no batteries or USB required, it supports 10,000+ tokens across 10+ blockchains and enables transactions by simply tapping the card to an NFC-enabled phone.

Nunchuk is a Bitcoin multisig wallet platform that combines cutting-edge security with inheritance planning. It supports multi-signature wallets with extensive hardware compatibility, enabling users to eliminate single points of failure while maintaining full self-custody without KYC. Pioneering autonomous Bitcoin inheritance with on-chain timelocks designed to outlive the company itself.

D'CENT All-in-One Wallet is a credit card-sized NFC cold wallet with a bank-grade certified secure chip for storing private keys offline. It supports Ethereum and 50+ EVM-compatible blockchain networks, enabling tap-to-sign transactions via NFC on a smartphone through the D'CENT mobile app.

Satochip is an NFC-powered hardware wallet in a credit card form factor, equipped with an EAL6+ certified secure element for generating and storing private keys offline. It supports Bitcoin, Ethereum, and 1,000+ cryptocurrencies via NFC tap or smart card reader, and is fully open source under the AGPLv3 license.

The ELLIPAL X Card is an NFC-based cold wallet that generates and stores private keys inside a CC EAL6+ certified secure chip. It supports 10,000+ tokens across 10+ blockchains, with transactions signed by simply tapping the card on your phone via NFC — no battery, charging, or firmware updates required.

CoolWallet Go is an NFC-powered crypto hardware wallet in a credit card form factor from CoolBitX. It features a CC EAL6+ certified secure element that generates and stores private keys offline. Battery-free and powered entirely by NFC, users tap the card to their phone to sign transactions via the CoolWallet App.

imKey Pro is a decentralized hardware wallet with CC EAL6+ military-grade security chip and offline private key storage. It supports 11 public chains including ETH, BTC, ATOM, and DOT, plus all EVM chains via custom RPC, with Bluetooth and USB connectivity.

Cypherock X1 decentralizes your private keys by cryptographically splitting them into 5 parts using Shamir's Secret Sharing. Each part is stored on the X1 Vault and 4 X1 Cards, requiring only 1 of 4 cards tapped on the vault to make transactions — with no seed phrase backup needed.

Blockstream Jade is a hardware wallet designed for securing bitcoin with fully air-gapped QR functionality. It allows you to scan and display QR codes directly on the device to send bitcoin and verify addresses without any USB or Bluetooth connection required.