With the current firmware replace, the BlockStream Jade can work just like the SeedSigner.
I depart the Jade as uninitialized, so it doesn’t retailer any seeds. To make use of it, simply activate Jade, scan the qr, and it’ll quickly load within the seed, after which it’s going to work with Blue Pockets or Nunchuk on the telephone completely.
It’s cheaper, $49 vs $80 (prebuild SeedSigner). And if you wish to construct a SeedSigner by yourself, the Raspberry Pi Zero is unreasonably pricy these days.
One other plus for Jade is the built-in battery, so it could actually work on the go. It additionally helps Bluetooth and usb, however I favor to maintain it totally air-gapped. I do not use the official Inexperienced pockets app anyway.