Why Perform Stress Tests?      Stress Test Methodology

Note: after testing 70 devices, I probably won't be testing many more - nearly every device these days is a similar design to some that have already been tested. If you want to have a good idea of how well an untested device will perform, read my Treatise on Bitcoin Seed Backup Device Design.

You may also find this sortable spreadsheet useful.


Device Overall Grade Heat Grade Corrosion Grade Crush Grade Price
Attenuo A A A A £50
Bitkee A A A A $40
Bitplate Domino A A A A £44.50
Bitplate Domino Grande A A A A £50.50
Black Seed Ink A A A A $27
Blockplate A A A A $79
Bravo Seed Card A A A A €40
Bravo Seed Coin A A A A €60
Bulletproof Bitcoin (DIY) A A A A ~$50
Codlkeys S A A A A $30
Coinplate Alpha A A A A $79
Coinplate Grid A A A A $75
Coinplate Punch A A A A $65
Coldbit Steel A A A A €82
CRYO A A A A $50
Crypto Keys A A A A $30
Crypto Key Stack A A A A $45
Cryptoetch A A A A 50 CHF
CryptoNumeris Board S A- A B A $32
CryptoNumeris Plate S A A A A $35
CryptoTag Odin A A A A $200
CryptoTag Thor A A A A $350
CryptoTag Zeus A A A A $130
DIYSeed A A A A $20
Hodlinox A A A A €30
Hodlinox Interlocking A A A A €34
Hodlinox Single Plate A A A A €13
Hodlrock Rock96 A A A A $74
qreg-hr A A A A €149
Quadrat Register 11 A A A A €149
Quadrat Register P A A A A €366
Safe Seed A A A A $28
Secret Seed Enigma A A A A $49
SeedSteel A A A A N/A
Seedplate A A A A $50
Simbit A A A A $110
Smallseed A A A A 48 CHF
Steel Wallet (DIY) A A A A ~$20
Steelwallet A A A A €65
Tinyseed A A A A €199
Tjernlund CC3P A A A A $40
Willi's Recovery Seed Plate A A A A €27
CipherSeks Double Plate A- A B A $60
CipherSeks Single Plate A- A B A $60
Codl Punchplate III A- A B A $30
Coldbit Passphrase A- A B A $15
Cryptosteel Capsule A- A A B $109
CryptoVault A- A B A $35
Hodlr Swiss A- A A B €119
ImpressSeed Titanium A- A B A $30
Keyois Capsule A- B A A $99
SAFU Ninja (DIY) A- A A B $15
SteelKi A- B A A $24
Cypherwheel B+ A A C $250
CryptoSteel Cassette B B A D $90
Keystone Tablet Punch B A D A $24
Billfodl C C A D $55
Cobo Tablet C F A D $39
Cold Storage Coins C F B B $20
ColdTI C D C A $21
Keystone Tablet Plus C F A A $49
Copper Seed Safe C- B C F $14
Blockstream Metal D A F - $80
CipherTag D A F F $6
The HODL Wallet D A F - N/A
The Steely D F A F $70
Ballet Crypto F F F F $35
BitHD Frozen Armor F F F - $30
Bunkeroid F F F - $130
Ellipal Mnemonic Metal F F F - $50
Steeldisk F F F - N/A

There are too many choices, how do I choose?

  1. Avoid using devices where the device manufacturer may know your private key. Such as Keyois Capsule, Cold Storage Coins, and Ballet Crypto. In some cases it’s possible to have a manufacturer create a BIP38 encrypted backup, which is safer but I wouldn’t recommend it.
  2. Simpler is better - more pieces means more potential points of failure.
  3. The best bang for your buck are the single plates with grids for center punched dots such as Bitplates, Blockplate, CodlKeys, Smallseed, or Steelwallet.
  4. The most durable devices I’ve tested are the Quadrat Register variants.

NOTE: this is an open source project! If you find any out-of-date information such as incorrect prices or broken links, please submit an issue.