Ledger
est. 2014
The best-selling hardware wallet family, with a secure element chip and the broadest asset support in the industry.
Hardware Wallets
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Hardware Wallets
Fact-checked 2026-08-14
Keystone
Established 2018
An air-gapped hardware wallet that talks to your phone only through QR codes — no USB, no Bluetooth.
Keystone's flagship Pro device is fully air-gapped: transactions are signed offline and exchanged with the companion app via animated QR codes. The 4-inch touchscreen makes verifying every transaction easy, and the firmware is open source.
Quick facts
Founded
2018
Category
Hardware Wallets
Platforms
iOS, Android, Desktop
Key facts
Air-gapped, Open source
Pros
- True air-gap — no radio, no cable attack surface
- Big touchscreen for transaction verification
- Open-source firmware with a large dev community
Cons
- QR workflow is slower than USB for frequent use
- App ecosystem is younger than Ledger/Trezor's
- No desktop-first companion app of its own
Best for
Holders who want maximum isolation from the internet
Fees
Hardware from ~US$99; no ongoing fees.
Security notes
Air-gapped design eliminates USB/Bluetooth attacks. Always verify addresses on the device screen — that's the whole point of the form factor.
air-gappedopen-sourceqr
Frequently asked questions
What is Keystone?
Keystone is An air-gapped hardware wallet that talks to your phone only through QR codes — no USB, no Bluetooth. Keystone's flagship Pro device is fully air-gapped: transactions are signed offline and exchanged with the companion app via animated QR codes. The 4-inch touchscreen makes verifying every transaction easy, and the firmware is open source.
Is Keystone safe to use?
Air-gapped design eliminates USB/Bluetooth attacks. Always verify addresses on the device screen — that's the whole point of the form factor. As always, verify details on the official site before trusting funds to any service.
How much does Keystone cost?
Hardware from ~US$99; no ongoing fees. Figures change — confirm current pricing on the official site before deciding.
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est. 2013
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BitBox02
est. 2015
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