More digging… SatoChip (the JCOP applet) is supposed to be the cold wallet. According to the repo, the only things that it is compatible with are PC apps (that i see) and only one of them isn’t a specially made fork:
Supported software clients
- Bitcoin: the Bitcoin Electrum-Satochip is a version of Electrum that was slightly modified to integrate the Satochip hardware wallet.
- Litecoin: the Litecoin Electrum-Satochip is a version of Electrum for Litecoin that was slightly modified to integrate the Satochip hardware wallet.
- Bitcoin Cash: the Electron Cash-Satochip is a version of Electron Cash that was slightly modified to integrate the Satochip hardware wallet. Note: Satochip is natively supported by Electron Cash, we strongly encourage you to download the client from the official website.
- eCash (XEC): Satochip is natively supported by Electrum ABC, we strongly encourage you to download the client from the official website.
- Metamask: you can use your Satochip hardware wallet with a forked version of Metamask called Satomask. To allow the communication between the card and your web browser, you will need the Satochip Bridge.
- MyEtherWallet: you can use your Satochip hardware wallet with a forked version of MyEtherWallet called MEW Satochip. To allow the communication between the card and your web browser, you will need the Satochip Bridge.
Hopefully their upcoming release is better.