BitcoinSafe
Current hardware-wallet comparison

COLDCARD Q vs Mk4: upgrade only for the workflow you need

Q adds a full keyboard, QR scanning, battery power, a larger display, and a second microSD slot. Mk4 is smaller and still firmware-supported, although Mk5 replaced it in the current compact lineup.

Published:
May 7, 2026
Last verified:
September 5, 2026
Review due:
February 28, 2027

Coinkite

COLDCARD Q

Product status
Current model
Asset scope
Bitcoin only
Signing workflow
QR, dual microSD, NFC, virtual disk, or USB-C with a compatible coordinator
Connectivity
USB-C, QR scanner, NFC, and two microSD slots
Software model
Source-available firmware; no required COLDCARD account or companion app

Coinkite

COLDCARD Mk4

Product status
Replaced by Mk5; firmware still supported
Asset scope
Bitcoin only
Signing workflow
microSD, NFC, virtual disk, or USB-C with a compatible coordinator
Connectivity
USB-C, NFC, and one microSD slot
Software model
Source-available firmware; no required COLDCARD account or companion app

Direct answer

Choose Q when its keyboard, QR scanner, battery operation, or second microSD slot materially improves your signing process. An existing Mk4 does not need replacement merely for the core security architecture: Coinkite documents Q as using the same model. Owners of either device should first follow the current seed-generation advisory, because installing fixed firmware does not repair an affected seed that already exists.

CoinkiteCoinkiteCoinkite
Current Q price and availability
Decision table

Side-by-side tradeoffs

Input and display

COLDCARD Q
50-key QWERTY keyboard, QR scanner, and 2.3-inch 320×240 LCD
COLDCARD Mk4
Numeric keypad and smaller display; Mk5 is the current compact successor
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Power and portability

COLDCARD Q
USB or three AAA batteries; 120×75×22 mm and 93 g without batteries
COLDCARD Mk4
USB powered; 88×52×10 mm with cover and about 30 g
Coinkite

Offline transfer options

COLDCARD Q
QR scanning plus two microSD slots; NFC and USB-C are optional alternatives
COLDCARD Mk4
One microSD slot; NFC, virtual disk, and USB-C are optional alternatives
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Security architecture

COLDCARD Q
Coinkite documents the same core security model as Mk4, including dual secure elements
COLDCARD Mk4
Dual secure elements with the same supported firmware branch as Mk5
CoinkiteCoinkiteCoinkite

Current owner action

COLDCARD Q
Use recommended Q firmware 1.5.2Q and check whether an existing seed requires migration
COLDCARD Mk4
Use recommended Mk4/Mk5 firmware 5.6.2 and check whether an existing seed requires migration
Coinkite
Conditional fit

Which setup fits which constraint

COLDCARD Q

Choose Q for QR and keyboard workflows

Q fits users who will use its larger display, full keyboard, QR scanner, battery power, or second microSD slot enough to justify a larger device.

COLDCARD Mk4

Keep Mk4 when its workflow is sufficient

An already-owned Mk4 can remain operational when current firmware, migration guidance, its smaller display, and one-card workflow meet your needs. Q is not a security-model replacement.

COLDCARD Q / COLDCARD Mk4

Pause before importing an old seed

For either device, read Coinkite’s live security status first. Updating firmware does not repair a seed that was generated on affected firmware.

Independent evidence

What other reviewers found

BTC Sessions

2025 side-by-side hardware-wallet comparison

BTC Sessions
Last verified
Retail devices demonstrated in the July 21, 2025 video
Method
An hour-long side-by-side walkthrough covering setup, desktop and mobile use, connectivity, companion software, air-gapped workflows, advanced features, dislikes, and price at publication.
Commercial disclosure
The episode disclosed Coinkite/COLDCARD as a sponsor and included a Coinkite discount. The reviewer also said COLDCARD was his daily device and personal preference.

Relevant observations

  • Trezor Safe 5 and Trezor Suite were presented as easier to learn, while COLDCARD Q offered more workflow choices with a steeper menu and coordinator learning curve.
  • Ledger Flex was designed around convenience, but the reviewer encountered confusion in the Ledger application workflow during setup.

Limitation

The video predates the August 2026 COLDCARD seed-generation advisory. Its preference ranking is not used here because of that timing and the disclosed sponsorship.

WalletScrutiny

COLDCARD Q code and custody review

WalletScrutiny
Method
Code-level and custody-methodology review covering user-held keys, public source availability, device behavior, and build-verification criteria.
Commercial disclosure
No product sponsorship or affiliate link was identified on the reviewed page.

Relevant observations

  • WalletScrutiny reported user-generated keys, public source, and a pass across its ten hardware-wallet methodology questions.

Limitation

Its product summary still listed an older 3.2-inch screen figure; current Coinkite documentation says 2.3 inches. BitcoinSafe therefore uses WalletScrutiny for methodology observations, not current dimensions.

WalletScrutiny

COLDCARD Mk4 code and custody review

WalletScrutiny
Method
Code-level and custody-methodology review covering user-held keys, public source availability, device behavior, and build-verification criteria.
Commercial disclosure
No product sponsorship or affiliate link was identified on the reviewed page.

Relevant observations

  • WalletScrutiny reported user-generated keys, public source, and a pass across its hardware-wallet methodology questions for Mk4.

Limitation

The page included current advisory language but retained older product-description text that called Mk4 the latest model. Current Coinkite status controls the legacy label used here.

Bitbo

COLDCARD Mk4 review and 2026 advisory note

Bitbo
Method
Long-form editorial review combining product documentation, workflow descriptions, comparison copy, and a current security-advisory banner.
Commercial disclosure
The page links to discounted commercial services and other monetized product content. BitcoinSafe treats it as commercially influenced editorial coverage.

Relevant observations

  • Bitbo prominently added the 2026 seed-generation warning and advised owners not to treat a firmware update as repair for an already-created seed.

Limitation

Older passages on the same page retain fixed prices and absolute security language. Those claims are not repeated here; Coinkite’s live advisory and specifications take precedence.

Evidence limits

Evidence limits

  • BitcoinSafe reviewed public documentation and attributed third-party observations. We did not perform a teardown, firmware audit, setup test, or recovery drill for these pages.
  • Product pages, firmware recommendations, support commitments, and security advisories can change. Recheck the linked first-party source before creating or importing a seed.
  • A hardware wallet does not remove backup, phishing, supply-chain, coordinator, inheritance, or transaction-verification risk.
Sources and verification dates

Sources and verification dates

Continue your research

Build your threat model

Identify the failure modes your wallet choice must address.

Understand PSBT workflows

Learn what removable-media and QR signing do and do not isolate.

Check current security status

Review current support windows and vendor advisories before setup.

Compare Q with Trezor Safe 5

Contrast flexible PSBT workflows with a guided touchscreen setup.

Frequently asked questions

Frequently asked questions

Where can I check the current COLDCARD Q price?

Use Coinkite’s official Q store page for the current price, stock, shipping, and taxes. This comparison does not quote a fixed price. Decide whether the keyboard and QR workflow solve a problem you actually have before paying to replace a working device.

Is COLDCARD Q a security upgrade over Mk4?

Coinkite documents Q as using the same core security model as Mk4. Its main differences are interaction and transfer options: a larger display, full keyboard, QR scanner, batteries, and a second microSD slot.

Is COLDCARD Mk4 still supported?

Yes for firmware as of September 5, 2026, but Coinkite says Mk4 has been replaced by Mk5. The current standard firmware branch covers Mk4 and Mk5.

Does installing current firmware fix an existing COLDCARD seed?

No. Coinkite says current firmware fixes future seed generation, but an affected seed already created may require migration under its live guidance.