8.9
Strong
Best Hardware Wallets · Review

BitBox02

Swiss-made, fully open, dual-chip, and the easiest of the serious devices to actually live with.

Best For
The best balance of open firmware and usability
Headline Cost
Around $150
Founded
2019
Rank in category
1 of 15
Last Checked
August 2026
The short answer

BitBox02 is the device we recommend most often. It pairs open, reproducibly built firmware with a genuine secure element, offers both seed and microSD backup, and its desktop app makes transaction verification clear rather than optional. Asset coverage is deliberately narrow.

Score breakdown

Category rubric →
Key isolation · 25%
9.0
Firmware openness · 20%
9.5
Recovery design · 20%
9.0
Asset coverage · 15%
7.0
Vendor conduct · 10%
9.5
Usability · 10%
9.0

Recommendable to most readers, with stated caveats. The headline 8.9 is the weighted mean of these marks — see our methodology. Not financial advice.

What we liked

  • Open-source firmware paired with a genuine secure element
  • MicroSD backup alongside the standard seed, both restorable elsewhere
  • Excellent desktop app with clear transaction verification

Where it falls short

  • Altcoin support is deliberately narrow
  • Touch-slider input takes some getting used to

The long-running argument in this category is open firmware versus a secure element: one lets researchers verify there is no backdoor, the other resists physical extraction. BitBox02 does both, which is why it scores highest of any device we rate and why it suits people who want strong security without a steep learning curve.

Backup and recovery

Two options: a standard BIP39 seed phrase you write down, or an encrypted microSD backup the device creates automatically. The microSD path is unusual and genuinely useful for people who will not reliably store a written phrase, and it does not lock you in — the seed remains recoverable on any compatible wallet, so the Swiss company behind it is never a necessary party to getting your funds back.

Day-to-day use

The BitBoxApp displays what you are signing in plain terms, with the device screen confirming addresses and amounts independently. Touch sliders replace buttons, which takes an hour to get used to. Bitcoin-only firmware is available for users who want the reduced attack surface, and the multi-edition supports Ethereum, ERC-20 tokens and a short list of major assets.

Who should use it

Almost anyone. It is the strongest default recommendation for a first hardware wallet and remains adequate for large holdings. Users needing many chains should look at Keystone or OneKey; Bitcoin maximalists should consider Coldcard or Passport.

FAQ

Is BitBox02 open source?
Yes — the firmware is open and reproducibly buildable, paired with a certified secure element, which is a combination few competitors offer.
What is the microSD backup?
An encrypted backup the device writes automatically at setup, as an alternative to writing down a seed phrase. The standard seed remains available and recoverable on other wallets.
Which coins does BitBox02 support?
Bitcoin, Ethereum and ERC-20 tokens plus a short list of majors on the multi edition. A Bitcoin-only edition reduces the firmware attack surface further.
BitBox02 or Trezor Safe 3?
Both pair open firmware with a secure element. BitBox02 has better software and microSD backup; Trezor is cheaper and supports more assets.
#ServiceBest forCostScore
1BitBox02The best balance of open firmware and usabilityAround $1508.9
2Trezor Safe 5Open-source purists who want a modern screenAround $1708.8
3Keystone 3 ProAir-gapped multi-chain signingAround $1308.7
4Trezor Safe 3Cheapest route to open firmware plus a secure elementAround $808.7
5OneKey ProOpen-source multi-chain with modern hardwareAround $2508.5
6Coldcard Mk4Bitcoin-only cold storage taken seriouslyAround $1608.3
7Foundation PassportAir-gapped Bitcoin with hardware you can inspectAround $1998.2
8GridPlus Lattice1DeFi users who want to read what they are signingAround $4008.0
9NGRAVE ZEROMaximum air-gap for long-term storageAround $4008.0
10Blockstream JadeAffordable open-source Bitcoin signingAround $657.9
11Ledger Nano XBroadest asset and application supportAround $1507.6
12SeedSignerStateless, self-built Bitcoin signingAround $50 in parts7.6
13Tangem WalletSimplest possible cold storage for beginnersAround $55 for a card set7.6
14SafePal S1Cheap air-gapped multi-chain storageAround $507.1
15Ellipal Titan 2.0Physically rugged air-gapped storageAround $1707.0