Tangem
Best for verifiable firmware openness
How it rates
- Firmware source published in a public repository
- No dedicated security or audit disclosure identified at this check
- Terms page not found at the conventional address at this check
Each indicator scores 2, 1 or 0. A pillar is the points earned over the points available; the overall score is the weighted sum. Every source below is public — check any of them yourself.
- MetFirmware source published in a public repository
Vendor repository reachable at this check.
github.com/tangem - Not metDevice security or specification page published
No dedicated security or specification page identified at this check.
- Not metIndependent security research or audit programme published
No published security research or audit programme identified at this check.
- Not metTechnical documentation reachable without an account
No open technical documentation identified at this check.
- MetVendor organisation identifiable from the repository
Repository published under the vendor organisation (Tangem AG).
github.com/tangem
- PartialShop or purchase page public
Published at a documented URL; automated retrieval blocked at this check.
tangem.com/ - Not metModel-specific product page public
Not identified at this check.
- Not metLegal or terms page public
Not found at the conventional address at this check.
- PartialSupport or help resource public
Published at a documented URL; automated retrieval blocked at this check.
tangem.com/ - PartialPurchase information viewable without an account
Published at a documented URL; automated retrieval blocked at this check.
tangem.com/
- Met
- Met
- Not metModel documentation published
Not identified at this check.
- Not metDocumentation site separate from marketing
Not identified at this check.
- Not metSecurity posture stated publicly
Not identified at this check.
- PartialVendor site resolves to automated verification
Published at a documented URL; automated retrieval blocked at this check.
tangem.com/ - Met
- Not metSecurity or disclosure page published
Not identified at this check.
- Not metTerms or legal documentation published
Not found at the conventional address at this check.
- PartialProduct range documented publicly
Published at a documented URL; automated retrieval blocked at this check.
tangem.com/
- PartialRoot site reachable without an account
Published at a documented URL; automated retrieval blocked at this check.
tangem.com/ - Not metDocumentation or support reachable
Not identified at this check.
- Met
- Partial
- Not metLegal documentation reachable
Not found at the conventional address at this check.
An NFC card wallet with no screen, cable or seed phrase, audited by three independent firms, behind a site that blocks automated verification.
Our assessment
Tangem is a set of NFC smart cards the size of a bank card. There is no screen, no battery and no cable: the card signs on its own EAL6+ Samsung secure element when tapped to a phone. There is also no seed phrase — recovery works by holding a second or third card from the same set.
A different physical form entirely
Every other device in this comparison is an object you have to hide. A Tangem card fits in a wallet and looks like a bank card, which changes the practical question from where to store it to what happens if the wallet is stolen. The answer is a PIN on the card and a backup card kept elsewhere.
Audited by three independent firms
Kudelski Security and Riscure have both audited the firmware, and Cure53 audited the mobile wallet in 2026. Three independent reviews from firms of that standing is more external scrutiny than most devices in this table can show, and it matters more for a closed physical product than for an open one.
Why the score does not reflect that
A firmware repository is published, but device security pages, model documentation, support resources and legal terms all resolved to automated-verification blocks or were unreachable at conventional addresses. Twelve indicators score zero and seven score partial. This is a measurement of what an outsider can retrieve, and on that measure the site actively gets in the way.
Who it suits
Tangem fits users who want the simplest possible cold storage — no cables, no seed phrase, no setup ritual — and who are reassured by the audit record rather than by published documentation. Buyers who evaluate on public evidence should look at Trezor, BitBox or Coldcard.
How rivals compare
| Service | Score | Best for | |
|---|---|---|---|
| Trezor | 9.9 | verifiable firmware openness | Read → |
Frequently asked
Does this score mean Tangem is secure?
No. It measures what a buyer can verify before purchase: published firmware source, documented security claims, and open documentation. Physical security is not tested by us and is not scored.
Why does firmware openness matter so much here?
It is the one substantive security property an outsider can check without specialist equipment. Everything else on a hardware wallet requires trusting the vendor or a third-party teardown.
What would raise this score?
Publishing firmware source, a dedicated security or audit page, and open technical documentation at stable public addresses — all of which are checkable by anyone.